boost/unordered/detail/implementation.hpp
// Copyright (C) 2003-2004 Jeremy B. Maitin-Shepard. // Copyright (C) 2005-2016 Daniel James // Copyright (C) 2022 Joaquin M Lopez Munoz. // Copyright (C) 2022 Christian Mazakas // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_UNORDERED_DETAIL_IMPLEMENTATION_HPP #define BOOST_UNORDERED_DETAIL_IMPLEMENTATION_HPP #include <boost/config.hpp> #if defined(BOOST_HAS_PRAGMA_ONCE) #pragma once #endif #include <boost/assert.hpp> #include <boost/core/allocator_traits.hpp> #include <boost/core/bit.hpp> #include <boost/core/no_exceptions_support.hpp> #include <boost/core/pointer_traits.hpp> #include <boost/limits.hpp> #include <boost/move/move.hpp> #include <boost/preprocessor/arithmetic/inc.hpp> #include <boost/preprocessor/cat.hpp> #include <boost/preprocessor/repetition/enum.hpp> #include <boost/preprocessor/repetition/enum_binary_params.hpp> #include <boost/preprocessor/repetition/enum_params.hpp> #include <boost/preprocessor/repetition/repeat_from_to.hpp> #include <boost/preprocessor/seq/enum.hpp> #include <boost/preprocessor/seq/size.hpp> #include <boost/swap.hpp> #include <boost/throw_exception.hpp> #include <boost/tuple/tuple.hpp> #include <boost/type_traits/add_lvalue_reference.hpp> #include <boost/type_traits/aligned_storage.hpp> #include <boost/type_traits/alignment_of.hpp> #include <boost/type_traits/integral_constant.hpp> #include <boost/type_traits/is_base_of.hpp> #include <boost/type_traits/is_class.hpp> #include <boost/type_traits/is_convertible.hpp> #include <boost/type_traits/is_empty.hpp> #include <boost/type_traits/is_nothrow_move_assignable.hpp> #include <boost/type_traits/is_nothrow_move_constructible.hpp> #include <boost/type_traits/is_nothrow_swappable.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/type_traits/make_void.hpp> #include <boost/type_traits/remove_const.hpp> #include <boost/unordered/detail/fca.hpp> #include <boost/unordered/detail/type_traits.hpp> #include <boost/unordered/detail/fwd.hpp> #include <boost/utility/addressof.hpp> #include <boost/utility/enable_if.hpp> #include <cmath> #include <iterator> #include <stdexcept> #include <utility> #if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) #include <type_traits> #endif //////////////////////////////////////////////////////////////////////////////// // Configuration // // Unless documented elsewhere these configuration macros should be considered // an implementation detail, I'll try not to break them, but you never know. // Use Sun C++ workarounds // I'm not sure which versions of the compiler require these workarounds, so // I'm just using them of everything older than the current test compilers // (as of May 2017). #if !defined(BOOST_UNORDERED_SUN_WORKAROUNDS1) #if BOOST_COMP_SUNPRO && BOOST_COMP_SUNPRO < BOOST_VERSION_NUMBER(5, 20, 0) #define BOOST_UNORDERED_SUN_WORKAROUNDS1 1 #else #define BOOST_UNORDERED_SUN_WORKAROUNDS1 0 #endif #endif // BOOST_UNORDERED_EMPLACE_LIMIT = The maximum number of parameters in // emplace (not including things like hints). Don't set it to a lower value, as // that might break something. #if !defined BOOST_UNORDERED_EMPLACE_LIMIT #define BOOST_UNORDERED_EMPLACE_LIMIT 10 #endif // BOOST_UNORDERED_TUPLE_ARGS // // Maximum number of std::tuple members to support, or 0 if std::tuple // isn't avaiable. More are supported when full C++11 is used. // Already defined, so do nothing #if defined(BOOST_UNORDERED_TUPLE_ARGS) // Assume if we have C++11 tuple it's properly variadic, // and just use a max number of 10 arguments. #elif !defined(BOOST_NO_CXX11_HDR_TUPLE) #define BOOST_UNORDERED_TUPLE_ARGS 10 // Visual C++ has a decent enough tuple for piecewise construction, // so use that if available, using _VARIADIC_MAX for the maximum // number of parameters. Note that this comes after the check // for a full C++11 tuple. #elif defined(BOOST_MSVC) #if !BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT #define BOOST_UNORDERED_TUPLE_ARGS 0 #elif defined(_VARIADIC_MAX) #define BOOST_UNORDERED_TUPLE_ARGS _VARIADIC_MAX #else #define BOOST_UNORDERED_TUPLE_ARGS 5 #endif // Assume that we don't have std::tuple #else #define BOOST_UNORDERED_TUPLE_ARGS 0 #endif #if BOOST_UNORDERED_TUPLE_ARGS #include <tuple> #endif // BOOST_UNORDERED_CXX11_CONSTRUCTION // // Use C++11 construction, requires variadic arguments, good construct support // in allocator_traits and piecewise construction of std::pair // Otherwise allocators aren't used for construction/destruction #if BOOST_UNORDERED_HAVE_PIECEWISE_CONSTRUCT && \ !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && BOOST_UNORDERED_TUPLE_ARGS #if BOOST_COMP_SUNPRO && BOOST_LIB_STD_GNU // Sun C++ std::pair piecewise construction doesn't seem to be exception safe. // (At least for Sun C++ 12.5 using libstdc++). #define BOOST_UNORDERED_CXX11_CONSTRUCTION 0 #elif BOOST_COMP_GNUC && BOOST_COMP_GNUC < BOOST_VERSION_NUMBER(4, 7, 0) // Piecewise construction in GCC 4.6 doesn't work for uncopyable types. #define BOOST_UNORDERED_CXX11_CONSTRUCTION 0 #elif !defined(BOOST_NO_CXX11_ALLOCATOR) #define BOOST_UNORDERED_CXX11_CONSTRUCTION 1 #endif #endif #if !defined(BOOST_UNORDERED_CXX11_CONSTRUCTION) #define BOOST_UNORDERED_CXX11_CONSTRUCTION 0 #endif #if BOOST_UNORDERED_CXX11_CONSTRUCTION #include <boost/mp11/list.hpp> #include <boost/mp11/algorithm.hpp> #endif // BOOST_UNORDERED_SUPPRESS_DEPRECATED // // Define to stop deprecation attributes #if defined(BOOST_UNORDERED_SUPPRESS_DEPRECATED) #define BOOST_UNORDERED_DEPRECATED(msg) #endif // BOOST_UNORDERED_DEPRECATED // // Wrapper around various depreaction attributes. #if defined(__has_cpp_attribute) && \ (!defined(__cplusplus) || __cplusplus >= 201402) #if __has_cpp_attribute(deprecated) && !defined(BOOST_UNORDERED_DEPRECATED) #define BOOST_UNORDERED_DEPRECATED(msg) [[deprecated(msg)]] #endif #endif #if !defined(BOOST_UNORDERED_DEPRECATED) #if defined(__GNUC__) && __GNUC__ >= 4 #define BOOST_UNORDERED_DEPRECATED(msg) __attribute__((deprecated)) #elif defined(_MSC_VER) && _MSC_VER >= 1400 #define BOOST_UNORDERED_DEPRECATED(msg) __declspec(deprecated(msg)) #elif defined(_MSC_VER) && _MSC_VER >= 1310 #define BOOST_UNORDERED_DEPRECATED(msg) __declspec(deprecated) #else #define BOOST_UNORDERED_DEPRECATED(msg) #endif #endif namespace boost { namespace unordered { namespace detail { template <typename Types> struct table; static const float minimum_max_load_factor = 1e-3f; static const std::size_t default_bucket_count = 0; struct move_tag { }; struct empty_emplace { }; struct no_key { no_key() {} template <class T> no_key(T const&) {} }; namespace func { template <class T> inline void ignore_unused_variable_warning(T const&) { } } ////////////////////////////////////////////////////////////////////////// // iterator SFINAE template <typename I> struct is_forward : boost::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<I>::iterator_category> { }; template <typename I, typename ReturnType> struct enable_if_forward : boost::enable_if_c<boost::unordered::detail::is_forward<I>::value, ReturnType> { }; template <typename I, typename ReturnType> struct disable_if_forward : boost::disable_if_c<boost::unordered::detail::is_forward<I>::value, ReturnType> { }; } } } namespace boost { namespace unordered { namespace detail { ////////////////////////////////////////////////////////////////////////// // insert_size/initial_size template <class I> inline typename boost::unordered::detail::enable_if_forward<I, std::size_t>::type insert_size(I i, I j) { return static_cast<std::size_t>(std::distance(i, j)); } template <class I> inline typename boost::unordered::detail::disable_if_forward<I, std::size_t>::type insert_size(I, I) { return 1; } template <class I> inline std::size_t initial_size(I i, I j, std::size_t num_buckets = boost::unordered::detail::default_bucket_count) { return (std::max)( boost::unordered::detail::insert_size(i, j), num_buckets); } ////////////////////////////////////////////////////////////////////////// // compressed template <typename T, int Index> struct compressed_base : boost::empty_value<T> { compressed_base(T const& x) : empty_value<T>(boost::empty_init_t(), x) { } compressed_base(T& x, move_tag) : empty_value<T>(boost::empty_init_t(), boost::move(x)) { } T& get() { return empty_value<T>::get(); } T const& get() const { return empty_value<T>::get(); } }; template <typename T, int Index> struct generate_base : boost::unordered::detail::compressed_base<T, Index> { typedef compressed_base<T, Index> type; generate_base() : type() {} }; template <typename T1, typename T2> struct compressed : private boost::unordered::detail::generate_base<T1, 1>::type, private boost::unordered::detail::generate_base<T2, 2>::type { typedef typename generate_base<T1, 1>::type base1; typedef typename generate_base<T2, 2>::type base2; typedef T1 first_type; typedef T2 second_type; first_type& first() { return static_cast<base1*>(this)->get(); } first_type const& first() const { return static_cast<base1 const*>(this)->get(); } second_type& second() { return static_cast<base2*>(this)->get(); } second_type const& second() const { return static_cast<base2 const*>(this)->get(); } template <typename First, typename Second> compressed(First const& x1, Second const& x2) : base1(x1), base2(x2) { } compressed(compressed const& x) : base1(x.first()), base2(x.second()) {} compressed(compressed& x, move_tag m) : base1(x.first(), m), base2(x.second(), m) { } void assign(compressed const& x) { first() = x.first(); second() = x.second(); } void move_assign(compressed& x) { first() = boost::move(x.first()); second() = boost::move(x.second()); } void swap(compressed& x) { boost::swap(first(), x.first()); boost::swap(second(), x.second()); } private: // Prevent assignment just to make use of assign or // move_assign explicit. compressed& operator=(compressed const&); }; ////////////////////////////////////////////////////////////////////////// // pair_traits // // Used to get the types from a pair without instantiating it. template <typename Pair> struct pair_traits { typedef typename Pair::first_type first_type; typedef typename Pair::second_type second_type; }; template <typename T1, typename T2> struct pair_traits<std::pair<T1, T2> > { typedef T1 first_type; typedef T2 second_type; }; #if defined(BOOST_MSVC) #pragma warning(push) #pragma warning(disable : 4512) // assignment operator could not be generated. #pragma warning(disable : 4345) // behavior change: an object of POD type // constructed with an initializer of the form () // will be default-initialized. #endif ////////////////////////////////////////////////////////////////////////// // Bits and pieces for implementing traits template <typename T> typename boost::add_lvalue_reference<T>::type make(); struct choice9 { typedef char (&type)[9]; }; struct choice8 : choice9 { typedef char (&type)[8]; }; struct choice7 : choice8 { typedef char (&type)[7]; }; struct choice6 : choice7 { typedef char (&type)[6]; }; struct choice5 : choice6 { typedef char (&type)[5]; }; struct choice4 : choice5 { typedef char (&type)[4]; }; struct choice3 : choice4 { typedef char (&type)[3]; }; struct choice2 : choice3 { typedef char (&type)[2]; }; struct choice1 : choice2 { typedef char (&type)[1]; }; choice1 choose(); typedef choice1::type yes_type; typedef choice2::type no_type; struct private_type { private_type const& operator,(int) const; }; template <typename T> no_type is_private_type(T const&); yes_type is_private_type(private_type const&); struct convert_from_anything { template <typename T> convert_from_anything(T const&); }; } } } //////////////////////////////////////////////////////////////////////////// // emplace_args // // Either forwarding variadic arguments, or storing the arguments in // emplace_args##n #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) #define BOOST_UNORDERED_EMPLACE_TEMPLATE typename... Args #define BOOST_UNORDERED_EMPLACE_ARGS BOOST_FWD_REF(Args)... args #define BOOST_UNORDERED_EMPLACE_FORWARD boost::forward<Args>(args)... #else #define BOOST_UNORDERED_EMPLACE_TEMPLATE typename Args #define BOOST_UNORDERED_EMPLACE_ARGS Args const& args #define BOOST_UNORDERED_EMPLACE_FORWARD args #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) #define BOOST_UNORDERED_EARGS_MEMBER(z, n, _) \ typedef BOOST_FWD_REF(BOOST_PP_CAT(A, n)) BOOST_PP_CAT(Arg, n); \ BOOST_PP_CAT(Arg, n) BOOST_PP_CAT(a, n); #else #define BOOST_UNORDERED_EARGS_MEMBER(z, n, _) \ typedef typename boost::add_lvalue_reference<BOOST_PP_CAT(A, n)>::type \ BOOST_PP_CAT(Arg, n); \ BOOST_PP_CAT(Arg, n) BOOST_PP_CAT(a, n); #endif #define BOOST_UNORDERED_FWD_PARAM(z, n, a) \ BOOST_FWD_REF(BOOST_PP_CAT(A, n)) BOOST_PP_CAT(a, n) #define BOOST_UNORDERED_CALL_FORWARD(z, i, a) \ boost::forward<BOOST_PP_CAT(A, i)>(BOOST_PP_CAT(a, i)) #define BOOST_UNORDERED_EARGS_INIT(z, n, _) \ BOOST_PP_CAT(a, n)(BOOST_PP_CAT(b, n)) #define BOOST_UNORDERED_EARGS(z, n, _) \ template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \ struct BOOST_PP_CAT(emplace_args, n) \ { \ BOOST_PP_REPEAT_##z(n, BOOST_UNORDERED_EARGS_MEMBER, _) BOOST_PP_CAT( \ emplace_args, n)(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, Arg, b)) \ : BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_EARGS_INIT, _) \ { \ } \ }; \ \ template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \ inline BOOST_PP_CAT(emplace_args, n)<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> \ create_emplace_args(BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_FWD_PARAM, b)) \ { \ BOOST_PP_CAT(emplace_args, n)<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> e( \ BOOST_PP_ENUM_PARAMS_Z(z, n, b)); \ return e; \ } namespace boost { namespace unordered { namespace detail { template <typename A0> struct emplace_args1 { BOOST_UNORDERED_EARGS_MEMBER(1, 0, _) explicit emplace_args1(Arg0 b0) : a0(b0) {} }; template <typename A0> inline emplace_args1<A0> create_emplace_args(BOOST_FWD_REF(A0) b0) { emplace_args1<A0> e(b0); return e; } template <typename A0, typename A1> struct emplace_args2 { BOOST_UNORDERED_EARGS_MEMBER(1, 0, _) BOOST_UNORDERED_EARGS_MEMBER(1, 1, _) emplace_args2(Arg0 b0, Arg1 b1) : a0(b0), a1(b1) {} }; template <typename A0, typename A1> inline emplace_args2<A0, A1> create_emplace_args( BOOST_FWD_REF(A0) b0, BOOST_FWD_REF(A1) b1) { emplace_args2<A0, A1> e(b0, b1); return e; } template <typename A0, typename A1, typename A2> struct emplace_args3 { BOOST_UNORDERED_EARGS_MEMBER(1, 0, _) BOOST_UNORDERED_EARGS_MEMBER(1, 1, _) BOOST_UNORDERED_EARGS_MEMBER(1, 2, _) emplace_args3(Arg0 b0, Arg1 b1, Arg2 b2) : a0(b0), a1(b1), a2(b2) {} }; template <typename A0, typename A1, typename A2> inline emplace_args3<A0, A1, A2> create_emplace_args( BOOST_FWD_REF(A0) b0, BOOST_FWD_REF(A1) b1, BOOST_FWD_REF(A2) b2) { emplace_args3<A0, A1, A2> e(b0, b1, b2); return e; } BOOST_UNORDERED_EARGS(1, 4, _) BOOST_UNORDERED_EARGS(1, 5, _) BOOST_UNORDERED_EARGS(1, 6, _) BOOST_UNORDERED_EARGS(1, 7, _) BOOST_UNORDERED_EARGS(1, 8, _) BOOST_UNORDERED_EARGS(1, 9, _) BOOST_PP_REPEAT_FROM_TO(10, BOOST_PP_INC(BOOST_UNORDERED_EMPLACE_LIMIT), BOOST_UNORDERED_EARGS, _) } } } #undef BOOST_UNORDERED_DEFINE_EMPLACE_ARGS #undef BOOST_UNORDERED_EARGS_MEMBER #undef BOOST_UNORDERED_EARGS_INIT #endif //////////////////////////////////////////////////////////////////////////////// // // Some utilities for implementing allocator_traits, but useful elsewhere so // they're always defined. namespace boost { namespace unordered { namespace detail { //////////////////////////////////////////////////////////////////////////// // Integral_constrant, true_type, false_type // // Uses the standard versions if available. #if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) using std::integral_constant; using std::true_type; using std::false_type; #else template <typename T, T Value> struct integral_constant { enum { value = Value }; }; typedef boost::unordered::detail::integral_constant<bool, true> true_type; typedef boost::unordered::detail::integral_constant<bool, false> false_type; #endif //////////////////////////////////////////////////////////////////////////// // Explicitly call a destructor #if defined(BOOST_MSVC) #pragma warning(push) #pragma warning(disable : 4100) // unreferenced formal parameter #endif namespace func { template <class T> inline void destroy(T* x) { x->~T(); } } #if defined(BOOST_MSVC) #pragma warning(pop) #endif ////////////////////////////////////////////////////////////////////////// // value_base // // Space used to store values. template <typename ValueType> struct value_base { typedef ValueType value_type; typename boost::aligned_storage<sizeof(value_type), boost::alignment_of<value_type>::value>::type data_; value_base() : data_() {} void* address() { return this; } value_type& value() { return *(ValueType*)this; } value_type const& value() const { return *(ValueType const*)this; } value_type* value_ptr() { return (ValueType*)this; } value_type const* value_ptr() const { return (ValueType const*)this; } private: value_base& operator=(value_base const&); }; ////////////////////////////////////////////////////////////////////////// // optional // TODO: Use std::optional when available. template <typename T> class optional { BOOST_MOVABLE_BUT_NOT_COPYABLE(optional) boost::unordered::detail::value_base<T> value_; bool has_value_; void destroy() { if (has_value_) { boost::unordered::detail::func::destroy(value_.value_ptr()); has_value_ = false; } } void move(optional<T>& x) { BOOST_ASSERT(!has_value_ && x.has_value_); new (value_.value_ptr()) T(boost::move(x.value_.value())); boost::unordered::detail::func::destroy(x.value_.value_ptr()); has_value_ = true; x.has_value_ = false; } public: optional() BOOST_NOEXCEPT : has_value_(false) {} optional(BOOST_RV_REF(optional<T>) x) : has_value_(false) { if (x.has_value_) { move(x); } } explicit optional(T const& x) : has_value_(true) { new (value_.value_ptr()) T(x); } optional& operator=(BOOST_RV_REF(optional<T>) x) { destroy(); if (x.has_value_) { move(x); } return *this; } ~optional() { destroy(); } bool has_value() const { return has_value_; } T& operator*() { return value_.value(); } T const& operator*() const { return value_.value(); } T* operator->() { return value_.value_ptr(); } T const* operator->() const { return value_.value_ptr(); } bool operator==(optional<T> const& x) const { return has_value_ ? x.has_value_ && value_.value() == x.value_.value() : !x.has_value_; } bool operator!=(optional<T> const& x) const { return !((*this) == x); } void swap(optional<T>& x) { if (has_value_ != x.has_value_) { if (has_value_) { x.move(*this); } else { move(x); } } else if (has_value_) { boost::swap(value_.value(), x.value_.value()); } } friend void swap(optional<T>& x, optional<T>& y) { x.swap(y); } }; } } } //////////////////////////////////////////////////////////////////////////////// // // Allocator traits // namespace boost { namespace unordered { namespace detail { template <typename Alloc> struct allocator_traits : boost::allocator_traits<Alloc> { }; template <typename Alloc, typename T> struct rebind_wrap : boost::allocator_rebind<Alloc, T> { }; } } } //////////////////////////////////////////////////////////////////////////// // Functions used to construct nodes. Emulates variadic construction, // piecewise construction etc. //////////////////////////////////////////////////////////////////////////// // construct_value // // Only use allocator_traits::construct, allocator_traits::destroy when full // C++11 support is available. #if BOOST_UNORDERED_CXX11_CONSTRUCTION #elif !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) namespace boost { namespace unordered { namespace detail { namespace func { template <typename T, typename... Args> inline void construct_value(T* address, BOOST_FWD_REF(Args)... args) { new ((void*)address) T(boost::forward<Args>(args)...); } } } } } #else namespace boost { namespace unordered { namespace detail { namespace func { template <typename T> inline void construct_value(T* address) { new ((void*)address) T(); } template <typename T, typename A0> inline void construct_value(T* address, BOOST_FWD_REF(A0) a0) { new ((void*)address) T(boost::forward<A0>(a0)); } } } } } #endif //////////////////////////////////////////////////////////////////////////// // Construct from tuple // // Used to emulate piecewise construction. #define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(z, n, namespace_) \ template <typename Alloc, typename T, \ BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \ void construct_from_tuple(Alloc&, T* ptr, \ namespace_::tuple<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> const& x) \ { \ new ((void*)ptr) \ T(BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_GET_TUPLE_ARG, namespace_)); \ } #define BOOST_UNORDERED_GET_TUPLE_ARG(z, n, namespace_) namespace_::get<n>(x) // construct_from_tuple for boost::tuple // The workaround for old Sun compilers comes later in the file. #if !BOOST_UNORDERED_SUN_WORKAROUNDS1 namespace boost { namespace unordered { namespace detail { namespace func { template <typename Alloc, typename T> void construct_from_tuple(Alloc&, T* ptr, boost::tuple<>) { new ((void*)ptr) T(); } BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 1, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 2, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 3, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 4, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 5, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 6, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 7, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 8, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 9, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 10, boost) } } } } #endif // construct_from_tuple for std::tuple #if !BOOST_UNORDERED_CXX11_CONSTRUCTION && BOOST_UNORDERED_TUPLE_ARGS namespace boost { namespace unordered { namespace detail { namespace func { template <typename Alloc, typename T> void construct_from_tuple(Alloc&, T* ptr, std::tuple<>) { new ((void*)ptr) T(); } BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 1, std) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 2, std) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 3, std) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 4, std) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 5, std) #if BOOST_UNORDERED_TUPLE_ARGS >= 6 BOOST_PP_REPEAT_FROM_TO(6, BOOST_PP_INC(BOOST_UNORDERED_TUPLE_ARGS), BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE, std) #endif } } } } #endif #undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE #undef BOOST_UNORDERED_GET_TUPLE_ARG // construct_from_tuple for boost::tuple on old versions of sunpro. // // Old versions of Sun C++ had problems with template overloads of // boost::tuple, so to fix it I added a distinct type for each length to // the overloads. That means there's no possible ambiguity between the // different overloads, so that the compiler doesn't get confused #if BOOST_UNORDERED_SUN_WORKAROUNDS1 #define BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(z, n, namespace_) \ template <typename Alloc, typename T, \ BOOST_PP_ENUM_PARAMS_Z(z, n, typename A)> \ void construct_from_tuple_impl(boost::unordered::detail::func::length<n>, \ Alloc&, T* ptr, \ namespace_::tuple<BOOST_PP_ENUM_PARAMS_Z(z, n, A)> const& x) \ { \ new ((void*)ptr) \ T(BOOST_PP_ENUM_##z(n, BOOST_UNORDERED_GET_TUPLE_ARG, namespace_)); \ } #define BOOST_UNORDERED_GET_TUPLE_ARG(z, n, namespace_) namespace_::get<n>(x) namespace boost { namespace unordered { namespace detail { namespace func { template <int N> struct length { }; template <typename Alloc, typename T> void construct_from_tuple_impl( boost::unordered::detail::func::length<0>, Alloc&, T* ptr, boost::tuple<>) { new ((void*)ptr) T(); } BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 1, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 2, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 3, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 4, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 5, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 6, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 7, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 8, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 9, boost) BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE(1, 10, boost) template <typename Alloc, typename T, typename Tuple> void construct_from_tuple(Alloc& alloc, T* ptr, Tuple const& x) { construct_from_tuple_impl(boost::unordered::detail::func::length< boost::tuples::length<Tuple>::value>(), alloc, ptr, x); } } } } } #undef BOOST_UNORDERED_CONSTRUCT_FROM_TUPLE #undef BOOST_UNORDERED_GET_TUPLE_ARG #endif namespace boost { namespace unordered { namespace detail { namespace func { //////////////////////////////////////////////////////////////////////// // Trait to check for piecewise construction. template <typename A0> struct use_piecewise { static choice1::type test( choice1, boost::unordered::piecewise_construct_t); static choice2::type test(choice2, ...); enum { value = sizeof(choice1::type) == sizeof(test(choose(), boost::unordered::detail::make<A0>())) }; }; #if BOOST_UNORDERED_CXX11_CONSTRUCTION //////////////////////////////////////////////////////////////////////// // Construct from variadic parameters template <typename Alloc, typename T, typename... Args> inline void construct_from_args( Alloc& alloc, T* address, BOOST_FWD_REF(Args)... args) { boost::allocator_construct( alloc, address, boost::forward<Args>(args)...); } // For backwards compatibility, implement a special case for // piecewise_construct with boost::tuple template <typename A0> struct detect_boost_tuple { template <typename T0, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9> static choice1::type test(choice1, boost::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> const&); static choice2::type test(choice2, ...); enum { value = sizeof(choice1::type) == sizeof(test(choose(), boost::unordered::detail::make<A0>())) }; }; // Special case for piecewise_construct template <class... Args, std::size_t... Is, class... TupleArgs> std::tuple<typename std::add_lvalue_reference<Args>::type...> to_std_tuple_impl(boost::mp11::mp_list<Args...>, boost::tuple<TupleArgs...>& tuple, boost::mp11::index_sequence<Is...>) { (void) tuple; return std::tuple<typename std::add_lvalue_reference<Args>::type...>( boost::get<Is>(tuple)...); } template <class T> using add_lvalue_reference_t = typename std::add_lvalue_reference<T>::type; template <class... Args> boost::mp11::mp_transform<add_lvalue_reference_t, boost::mp11::mp_remove<std::tuple<Args...>, boost::tuples::null_type> > to_std_tuple(boost::tuple<Args...>& tuple) { using list = boost::mp11::mp_remove<boost::mp11::mp_list<Args...>, boost::tuples::null_type>; using list_size = boost::mp11::mp_size<list>; using index_seq = boost::mp11::make_index_sequence<list_size::value>; return to_std_tuple_impl(list{}, tuple, index_seq{}); } template <typename Alloc, typename A, typename B, typename A0, typename A1, typename A2> inline typename boost::enable_if_c<use_piecewise<A0>::value && detect_boost_tuple<A1>::value && detect_boost_tuple<A2>::value, void>::type construct_from_args(Alloc& alloc, std::pair<A, B>* address, BOOST_FWD_REF(A0), BOOST_FWD_REF(A1) a1, BOOST_FWD_REF(A2) a2) { boost::allocator_construct(alloc, address, std::piecewise_construct, to_std_tuple(a1), to_std_tuple(a2)); } #elif !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) //////////////////////////////////////////////////////////////////////// // Construct from variadic parameters template <typename Alloc, typename T, typename... Args> inline void construct_from_args( Alloc&, T* address, BOOST_FWD_REF(Args)... args) { new ((void*)address) T(boost::forward<Args>(args)...); } // Special case for piecewise_construct template <typename Alloc, typename A, typename B, typename A0, typename A1, typename A2> inline typename enable_if<use_piecewise<A0>, void>::type construct_from_args(Alloc& alloc, std::pair<A, B>* address, BOOST_FWD_REF(A0), BOOST_FWD_REF(A1) a1, BOOST_FWD_REF(A2) a2) { boost::unordered::detail::func::construct_from_tuple( alloc, boost::addressof(address->first), boost::forward<A1>(a1)); BOOST_TRY { boost::unordered::detail::func::construct_from_tuple( alloc, boost::addressof(address->second), boost::forward<A2>(a2)); } BOOST_CATCH(...) { boost::unordered::detail::func::destroy( boost::addressof(address->first)); BOOST_RETHROW } BOOST_CATCH_END } #else // BOOST_NO_CXX11_VARIADIC_TEMPLATES //////////////////////////////////////////////////////////////////////// // Construct from emplace_args // Explicitly write out first three overloads for the sake of sane // error messages. template <typename Alloc, typename T, typename A0> inline void construct_from_args( Alloc&, T* address, emplace_args1<A0> const& args) { new ((void*)address) T(boost::forward<A0>(args.a0)); } template <typename Alloc, typename T, typename A0, typename A1> inline void construct_from_args( Alloc&, T* address, emplace_args2<A0, A1> const& args) { new ((void*)address) T(boost::forward<A0>(args.a0), boost::forward<A1>(args.a1)); } template <typename Alloc, typename T, typename A0, typename A1, typename A2> inline void construct_from_args( Alloc&, T* address, emplace_args3<A0, A1, A2> const& args) { new ((void*)address) T(boost::forward<A0>(args.a0), boost::forward<A1>(args.a1), boost::forward<A2>(args.a2)); } // Use a macro for the rest. #define BOOST_UNORDERED_CONSTRUCT_IMPL(z, num_params, _) \ template <typename Alloc, typename T, \ BOOST_PP_ENUM_PARAMS_Z(z, num_params, typename A)> \ inline void construct_from_args(Alloc&, T* address, \ boost::unordered::detail::BOOST_PP_CAT(emplace_args, num_params) < \ BOOST_PP_ENUM_PARAMS_Z(z, num_params, A) > const& args) \ { \ new ((void*)address) \ T(BOOST_PP_ENUM_##z(num_params, BOOST_UNORDERED_CALL_FORWARD, args.a)); \ } BOOST_UNORDERED_CONSTRUCT_IMPL(1, 4, _) BOOST_UNORDERED_CONSTRUCT_IMPL(1, 5, _) BOOST_UNORDERED_CONSTRUCT_IMPL(1, 6, _) BOOST_UNORDERED_CONSTRUCT_IMPL(1, 7, _) BOOST_UNORDERED_CONSTRUCT_IMPL(1, 8, _) BOOST_UNORDERED_CONSTRUCT_IMPL(1, 9, _) BOOST_PP_REPEAT_FROM_TO(10, BOOST_PP_INC(BOOST_UNORDERED_EMPLACE_LIMIT), BOOST_UNORDERED_CONSTRUCT_IMPL, _) #undef BOOST_UNORDERED_CONSTRUCT_IMPL // Construct with piecewise_construct template <typename Alloc, typename A, typename B, typename A0, typename A1, typename A2> inline typename enable_if<use_piecewise<A0>, void>::type construct_from_args(Alloc& alloc, std::pair<A, B>* address, boost::unordered::detail::emplace_args3<A0, A1, A2> const& args) { boost::unordered::detail::func::construct_from_tuple( alloc, boost::addressof(address->first), args.a1); BOOST_TRY { boost::unordered::detail::func::construct_from_tuple( alloc, boost::addressof(address->second), args.a2); } BOOST_CATCH(...) { boost::unordered::detail::func::destroy( boost::addressof(address->first)); BOOST_RETHROW } BOOST_CATCH_END } #endif // BOOST_NO_CXX11_VARIADIC_TEMPLATES } } } } namespace boost { namespace unordered { namespace detail { /////////////////////////////////////////////////////////////////// // // Node construction template <typename NodeAlloc> struct node_constructor { typedef NodeAlloc node_allocator; typedef boost::unordered::detail::allocator_traits<NodeAlloc> node_allocator_traits; typedef typename node_allocator_traits::value_type node; typedef typename node_allocator_traits::pointer node_pointer; typedef typename node::value_type value_type; node_allocator& alloc_; node_pointer node_; node_constructor(node_allocator& n) : alloc_(n), node_() {} ~node_constructor(); void create_node(); // no throw node_pointer release() { BOOST_ASSERT(node_); node_pointer p = node_; node_ = node_pointer(); return p; } private: node_constructor(node_constructor const&); node_constructor& operator=(node_constructor const&); }; template <typename Alloc> node_constructor<Alloc>::~node_constructor() { if (node_) { boost::unordered::detail::func::destroy(boost::to_address(node_)); node_allocator_traits::deallocate(alloc_, node_, 1); } } template <typename Alloc> void node_constructor<Alloc>::create_node() { BOOST_ASSERT(!node_); node_ = node_allocator_traits::allocate(alloc_, 1); new ((void*)boost::to_address(node_)) node(); } template <typename NodeAlloc> struct node_tmp { typedef typename boost::allocator_value_type<NodeAlloc>::type node; typedef typename boost::allocator_pointer<NodeAlloc>::type node_pointer; typedef typename node::value_type value_type; typedef typename boost::allocator_rebind<NodeAlloc, value_type>::type value_allocator; NodeAlloc& alloc_; node_pointer node_; explicit node_tmp(node_pointer n, NodeAlloc& a) : alloc_(a), node_(n) {} ~node_tmp(); // no throw node_pointer release() { node_pointer p = node_; node_ = node_pointer(); return p; } }; template <typename Alloc> node_tmp<Alloc>::~node_tmp() { if (node_) { value_allocator val_alloc(alloc_); boost::allocator_destroy(val_alloc, node_->value_ptr()); boost::allocator_deallocate(alloc_, node_, 1); } } } } } namespace boost { namespace unordered { namespace detail { namespace func { // Some nicer construct_node functions, might try to // improve implementation later. template <typename Alloc, BOOST_UNORDERED_EMPLACE_TEMPLATE> inline typename boost::allocator_pointer<Alloc>::type construct_node_from_args(Alloc& alloc, BOOST_UNORDERED_EMPLACE_ARGS) { typedef typename boost::allocator_value_type<Alloc>::type node; typedef typename node::value_type value_type; typedef typename boost::allocator_rebind<Alloc, value_type>::type value_allocator; value_allocator val_alloc(alloc); node_constructor<Alloc> a(alloc); a.create_node(); construct_from_args( val_alloc, a.node_->value_ptr(), BOOST_UNORDERED_EMPLACE_FORWARD); return a.release(); } template <typename Alloc, typename U> inline typename boost::allocator_pointer<Alloc>::type construct_node( Alloc& alloc, BOOST_FWD_REF(U) x) { node_constructor<Alloc> a(alloc); a.create_node(); typedef typename boost::allocator_value_type<Alloc>::type node; typedef typename node::value_type value_type; typedef typename boost::allocator_rebind<Alloc, value_type>::type value_allocator; value_allocator val_alloc(alloc); boost::allocator_construct( val_alloc, a.node_->value_ptr(), boost::forward<U>(x)); return a.release(); } #if BOOST_UNORDERED_CXX11_CONSTRUCTION template <typename Alloc, typename Key> inline typename boost::allocator_pointer<Alloc>::type construct_node_pair(Alloc& alloc, BOOST_FWD_REF(Key) k) { node_constructor<Alloc> a(alloc); a.create_node(); typedef typename boost::allocator_value_type<Alloc>::type node; typedef typename node::value_type value_type; typedef typename boost::allocator_rebind<Alloc, value_type>::type value_allocator; value_allocator val_alloc(alloc); boost::allocator_construct( val_alloc, a.node_->value_ptr(), std::piecewise_construct, std::forward_as_tuple(boost::forward<Key>(k)), std::forward_as_tuple()); return a.release(); } template <typename Alloc, typename Key, typename Mapped> inline typename boost::allocator_pointer<Alloc>::type construct_node_pair( Alloc& alloc, BOOST_FWD_REF(Key) k, BOOST_FWD_REF(Mapped) m) { node_constructor<Alloc> a(alloc); a.create_node(); typedef typename boost::allocator_value_type<Alloc>::type node; typedef typename node::value_type value_type; typedef typename boost::allocator_rebind<Alloc, value_type>::type value_allocator; value_allocator val_alloc(alloc); boost::allocator_construct(val_alloc, a.node_->value_ptr(), std::piecewise_construct, std::forward_as_tuple(boost::forward<Key>(k)), std::forward_as_tuple(boost::forward<Mapped>(m))); return a.release(); } template <typename Alloc, typename Key, typename... Args> inline typename boost::allocator_pointer<Alloc>::type construct_node_pair_from_args( Alloc& alloc, BOOST_FWD_REF(Key) k, BOOST_FWD_REF(Args)... args) { node_constructor<Alloc> a(alloc); a.create_node(); typedef typename boost::allocator_value_type<Alloc>::type node; typedef typename node::value_type value_type; typedef typename boost::allocator_rebind<Alloc, value_type>::type value_allocator; value_allocator val_alloc(alloc); #if !(BOOST_COMP_CLANG && BOOST_COMP_CLANG < BOOST_VERSION_NUMBER(3, 8, 0) && \ defined(BOOST_LIBSTDCXX11)) boost::allocator_construct(val_alloc, a.node_->value_ptr(), std::piecewise_construct, std::forward_as_tuple(boost::forward<Key>(k)), std::forward_as_tuple(boost::forward<Args>(args)...)); #else // It doesn't seem to be possible to construct a tuple with 3 variadic // rvalue reference members when using older versions of clang with // libstdc++, so just use std::make_tuple instead of // std::forward_as_tuple. boost::allocator_construct(val_alloc, a.node_->value_ptr(), std::piecewise_construct, std::forward_as_tuple(boost::forward<Key>(k)), std::make_tuple(boost::forward<Args>(args)...)); #endif return a.release(); } #else template <typename Alloc, typename Key> inline typename boost::unordered::detail::allocator_traits<Alloc>::pointer construct_node_pair(Alloc& alloc, BOOST_FWD_REF(Key) k) { node_constructor<Alloc> a(alloc); a.create_node(); boost::unordered::detail::func::construct_value( boost::addressof(a.node_->value_ptr()->first), boost::forward<Key>(k)); BOOST_TRY { boost::unordered::detail::func::construct_value( boost::addressof(a.node_->value_ptr()->second)); } BOOST_CATCH(...) { boost::unordered::detail::func::destroy( boost::addressof(a.node_->value_ptr()->first)); BOOST_RETHROW } BOOST_CATCH_END return a.release(); } template <typename Alloc, typename Key, typename Mapped> inline typename boost::unordered::detail::allocator_traits<Alloc>::pointer construct_node_pair( Alloc& alloc, BOOST_FWD_REF(Key) k, BOOST_FWD_REF(Mapped) m) { node_constructor<Alloc> a(alloc); a.create_node(); boost::unordered::detail::func::construct_value( boost::addressof(a.node_->value_ptr()->first), boost::forward<Key>(k)); BOOST_TRY { boost::unordered::detail::func::construct_value( boost::addressof(a.node_->value_ptr()->second), boost::forward<Mapped>(m)); } BOOST_CATCH(...) { boost::unordered::detail::func::destroy( boost::addressof(a.node_->value_ptr()->first)); BOOST_RETHROW } BOOST_CATCH_END return a.release(); } template <typename Alloc, typename Key, BOOST_UNORDERED_EMPLACE_TEMPLATE> inline typename boost::unordered::detail::allocator_traits<Alloc>::pointer construct_node_pair_from_args( Alloc& alloc, BOOST_FWD_REF(Key) k, BOOST_UNORDERED_EMPLACE_ARGS) { node_constructor<Alloc> a(alloc); a.create_node(); boost::unordered::detail::func::construct_value( boost::addressof(a.node_->value_ptr()->first), boost::forward<Key>(k)); BOOST_TRY { boost::unordered::detail::func::construct_from_args(alloc, boost::addressof(a.node_->value_ptr()->second), BOOST_UNORDERED_EMPLACE_FORWARD); } BOOST_CATCH(...) { boost::unordered::detail::func::destroy( boost::addressof(a.node_->value_ptr()->first)); BOOST_RETHROW } BOOST_CATCH_END return a.release(); } #endif } } } } #if defined(BOOST_MSVC) #pragma warning(pop) #endif namespace boost { namespace unordered { namespace detail { ////////////////////////////////////////////////////////////////////////// // Functions // // This double buffers the storage for the hash function and key equality // predicate in order to have exception safe copy/swap. To do so, // use 'construct_spare' to construct in the spare space, and then when // ready to use 'switch_functions' to switch to the new functions. // If an exception is thrown between these two calls, use // 'cleanup_spare_functions' to destroy the unused constructed functions. #if defined(_GLIBCXX_HAVE_BUILTIN_LAUNDER) // gcc-12 warns when accessing the `current_functions` of our `functions` // class below with `-Wmaybe-unitialized`. By laundering the pointer, we // silence the warning and assure the compiler that a valid object exists // in that region of storage. This warning is also generated in C++03 // which does not have `std::launder`. The compiler builtin is always // available, regardless of the C++ standard used when compiling. template <class T> T* launder(T* p) BOOST_NOEXCEPT { return __builtin_launder(p); } #else template <class T> T* launder(T* p) BOOST_NOEXCEPT { return p; } #endif template <class H, class P> class functions { public: static const bool nothrow_move_assignable = boost::is_nothrow_move_assignable<H>::value && boost::is_nothrow_move_assignable<P>::value; static const bool nothrow_move_constructible = boost::is_nothrow_move_constructible<H>::value && boost::is_nothrow_move_constructible<P>::value; static const bool nothrow_swappable = boost::is_nothrow_swappable<H>::value && boost::is_nothrow_swappable<P>::value; private: functions& operator=(functions const&); typedef compressed<H, P> function_pair; typedef typename boost::aligned_storage<sizeof(function_pair), boost::alignment_of<function_pair>::value>::type aligned_function; unsigned char current_; // 0/1 - Currently active functions // +2 - Both constructed aligned_function funcs_[2]; public: functions(H const& hf, P const& eq) : current_(0) { construct_functions(current_, hf, eq); } functions(functions const& bf) : current_(0) { construct_functions(current_, bf.current_functions()); } functions(functions& bf, boost::unordered::detail::move_tag) : current_(0) { construct_functions(current_, bf.current_functions(), boost::unordered::detail::integral_constant<bool, nothrow_move_constructible>()); } ~functions() { BOOST_ASSERT(!(current_ & 2)); destroy_functions(current_); } H const& hash_function() const { return current_functions().first(); } P const& key_eq() const { return current_functions().second(); } function_pair const& current_functions() const { return *::boost::unordered::detail::launder( static_cast<function_pair const*>( static_cast<void const*>(funcs_[current_ & 1].address()))); } function_pair& current_functions() { return *::boost::unordered::detail::launder( static_cast<function_pair*>( static_cast<void*>(funcs_[current_ & 1].address()))); } void construct_spare_functions(function_pair const& f) { BOOST_ASSERT(!(current_ & 2)); construct_functions(current_ ^ 1, f); current_ |= 2; } void cleanup_spare_functions() { if (current_ & 2) { current_ = static_cast<unsigned char>(current_ & 1); destroy_functions(current_ ^ 1); } } void switch_functions() { BOOST_ASSERT(current_ & 2); destroy_functions(static_cast<unsigned char>(current_ & 1)); current_ ^= 3; } private: void construct_functions(unsigned char which, H const& hf, P const& eq) { BOOST_ASSERT(!(which & 2)); new ((void*)&funcs_[which]) function_pair(hf, eq); } void construct_functions(unsigned char which, function_pair const& f, boost::unordered::detail::false_type = boost::unordered::detail::false_type()) { BOOST_ASSERT(!(which & 2)); new ((void*)&funcs_[which]) function_pair(f); } void construct_functions(unsigned char which, function_pair& f, boost::unordered::detail::true_type) { BOOST_ASSERT(!(which & 2)); new ((void*)&funcs_[which]) function_pair(f, boost::unordered::detail::move_tag()); } void destroy_functions(unsigned char which) { BOOST_ASSERT(!(which & 2)); boost::unordered::detail::func::destroy( (function_pair*)(&funcs_[which])); } }; //////////////////////////////////////////////////////////////////////////// // rvalue parameters when type can't be a BOOST_RV_REF(T) parameter // e.g. for int #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) #define BOOST_UNORDERED_RV_REF(T) BOOST_RV_REF(T) #else struct please_ignore_this_overload { typedef please_ignore_this_overload type; }; template <typename T> struct rv_ref_impl { typedef BOOST_RV_REF(T) type; }; template <typename T> struct rv_ref : boost::conditional<boost::is_class<T>::value, boost::unordered::detail::rv_ref_impl<T>, please_ignore_this_overload>::type { }; #define BOOST_UNORDERED_RV_REF(T) \ typename boost::unordered::detail::rv_ref<T>::type #endif #if defined(BOOST_MSVC) #pragma warning(push) #pragma warning(disable : 4127) // conditional expression is constant #endif ////////////////////////////////////////////////////////////////////////// // convert double to std::size_t inline std::size_t double_to_size(double f) { return f >= static_cast<double>( (std::numeric_limits<std::size_t>::max)()) ? (std::numeric_limits<std::size_t>::max)() : static_cast<std::size_t>(f); } ////////////////////////////////////////////////////////////////////////// // iterator definitions namespace iterator_detail { template <class Node, class Bucket> class c_iterator; template <class Node, class Bucket> class iterator { public: typedef typename Node::value_type value_type; typedef value_type element_type; typedef value_type* pointer; typedef value_type& reference; typedef std::ptrdiff_t difference_type; typedef std::forward_iterator_tag iterator_category; iterator() : p(), itb(){}; reference operator*() const BOOST_NOEXCEPT { return dereference(); } pointer operator->() const BOOST_NOEXCEPT { pointer x = boost::addressof(p->value()); return x; } iterator& operator++() BOOST_NOEXCEPT { increment(); return *this; } iterator operator++(int) BOOST_NOEXCEPT { iterator old = *this; increment(); return old; } bool operator==(iterator const& other) const BOOST_NOEXCEPT { return equal(other); } bool operator!=(iterator const& other) const BOOST_NOEXCEPT { return !equal(other); } bool operator==( boost::unordered::detail::iterator_detail::c_iterator<Node, Bucket> const& other) const BOOST_NOEXCEPT { return equal(other); } bool operator!=( boost::unordered::detail::iterator_detail::c_iterator<Node, Bucket> const& other) const BOOST_NOEXCEPT { return !equal(other); } private: typedef typename Node::node_pointer node_pointer; typedef grouped_bucket_iterator<Bucket> bucket_iterator; node_pointer p; bucket_iterator itb; template <class Types> friend struct boost::unordered::detail::table; template <class N, class B> friend class c_iterator; iterator(node_pointer p_, bucket_iterator itb_) : p(p_), itb(itb_) {} value_type& dereference() const BOOST_NOEXCEPT { return p->value(); } bool equal(const iterator& x) const BOOST_NOEXCEPT { return (p == x.p); } bool equal( const boost::unordered::detail::iterator_detail::c_iterator<Node, Bucket>& x) const BOOST_NOEXCEPT { return (p == x.p); } void increment() BOOST_NOEXCEPT { p = p->next; if (!p) { p = (++itb)->next; } } }; template <class Node, class Bucket> class c_iterator { public: typedef typename Node::value_type value_type; typedef value_type const element_type; typedef value_type const* pointer; typedef value_type const& reference; typedef std::ptrdiff_t difference_type; typedef std::forward_iterator_tag iterator_category; c_iterator() : p(), itb(){}; c_iterator(iterator<Node, Bucket> it) : p(it.p), itb(it.itb) {} reference operator*() const BOOST_NOEXCEPT { return dereference(); } pointer operator->() const BOOST_NOEXCEPT { pointer x = boost::addressof(p->value()); return x; } c_iterator& operator++() BOOST_NOEXCEPT { increment(); return *this; } c_iterator operator++(int) BOOST_NOEXCEPT { c_iterator old = *this; increment(); return old; } bool operator==(c_iterator const& other) const BOOST_NOEXCEPT { return equal(other); } bool operator!=(c_iterator const& other) const BOOST_NOEXCEPT { return !equal(other); } bool operator==( boost::unordered::detail::iterator_detail::iterator<Node, Bucket> const& other) const BOOST_NOEXCEPT { return equal(other); } bool operator!=( boost::unordered::detail::iterator_detail::iterator<Node, Bucket> const& other) const BOOST_NOEXCEPT { return !equal(other); } private: typedef typename Node::node_pointer node_pointer; typedef grouped_bucket_iterator<Bucket> bucket_iterator; node_pointer p; bucket_iterator itb; template <class Types> friend struct boost::unordered::detail::table; template <class, class> friend class iterator; c_iterator(node_pointer p_, bucket_iterator itb_) : p(p_), itb(itb_) { } value_type const& dereference() const BOOST_NOEXCEPT { return p->value(); } bool equal(const c_iterator& x) const BOOST_NOEXCEPT { return (p == x.p); } void increment() BOOST_NOEXCEPT { p = p->next; if (!p) { p = (++itb)->next; } } }; } // namespace iterator_detail ////////////////////////////////////////////////////////////////////////// // table structure used by the containers template <typename Types> struct table : boost::unordered::detail::functions<typename Types::hasher, typename Types::key_equal> { private: table(table const&); table& operator=(table const&); public: typedef typename Types::hasher hasher; typedef typename Types::key_equal key_equal; typedef typename Types::const_key_type const_key_type; typedef typename Types::extractor extractor; typedef typename Types::value_type value_type; typedef typename Types::table table_impl; typedef boost::unordered::detail::functions<typename Types::hasher, typename Types::key_equal> functions; typedef typename Types::value_allocator value_allocator; typedef typename boost::allocator_void_pointer<value_allocator>::type void_pointer; typedef node<value_type, void_pointer> node_type; typedef boost::unordered::detail::grouped_bucket_array< bucket<node_type, void_pointer>, value_allocator, prime_fmod_size<> > bucket_array_type; typedef typename bucket_array_type::node_allocator_type node_allocator_type; typedef typename boost::allocator_pointer<node_allocator_type>::type node_pointer; typedef boost::unordered::detail::node_constructor<node_allocator_type> node_constructor; typedef boost::unordered::detail::node_tmp<node_allocator_type> node_tmp; typedef typename bucket_array_type::bucket_type bucket_type; typedef typename bucket_array_type::iterator bucket_iterator; typedef typename bucket_array_type::local_iterator l_iterator; typedef typename bucket_array_type::const_local_iterator cl_iterator; typedef std::size_t size_type; typedef iterator_detail::iterator<node_type, bucket_type> iterator; typedef iterator_detail::c_iterator<node_type, bucket_type> c_iterator; typedef std::pair<iterator, bool> emplace_return; //////////////////////////////////////////////////////////////////////// // Members std::size_t size_; float mlf_; std::size_t max_load_; bucket_array_type buckets_; public: //////////////////////////////////////////////////////////////////////// // Data access size_type bucket_count() const { return buckets_.bucket_count(); } template <class Key> iterator next_group(Key const& k, c_iterator n) const { c_iterator last = this->end(); while (n != last && this->key_eq()(k, extractor::extract(*n))) { ++n; } return iterator(n.p, n.itb); } template <class Key> std::size_t group_count(Key const& k) const { if (size_ == 0) { return 0; } std::size_t c = 0; std::size_t const key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); bool found = false; for (node_pointer pos = itb->next; pos; pos = pos->next) { if (this->key_eq()(k, this->get_key(pos))) { ++c; found = true; } else if (found) { break; } } return c; } node_allocator_type const& node_alloc() const { return buckets_.get_node_allocator(); } node_allocator_type& node_alloc() { return buckets_.get_node_allocator(); } std::size_t max_bucket_count() const { typedef typename bucket_array_type::size_policy size_policy; return size_policy::size(size_policy::size_index( boost::allocator_max_size(this->node_alloc()))); } iterator begin() const { if (size_ == 0) { return end(); } bucket_iterator itb = buckets_.begin(); return iterator(itb->next, itb); } iterator end() const { return iterator(); } l_iterator begin(std::size_t bucket_index) const { return buckets_.begin(bucket_index); } std::size_t hash_to_bucket(std::size_t hash_value) const { return buckets_.position(hash_value); } std::size_t bucket_size(std::size_t index) const { std::size_t count = 0; if (size_ > 0) { bucket_iterator itb = buckets_.at(index); node_pointer n = itb->next; while (n) { ++count; n = n->next; } } return count; } //////////////////////////////////////////////////////////////////////// // Load methods void recalculate_max_load() { // From 6.3.1/13: // Only resize when size >= mlf_ * count std::size_t const bc = buckets_.bucket_count(); // it's important we do the `bc == 0` check here because the `mlf_` // can be specified to be infinity. The operation `n * INF` is `INF` // for all `n > 0` but NaN for `n == 0`. // max_load_ = bc == 0 ? 0 : boost::unordered::detail::double_to_size( static_cast<double>(mlf_) * static_cast<double>(bc)); } void max_load_factor(float z) { BOOST_ASSERT(z > 0); mlf_ = (std::max)(z, minimum_max_load_factor); recalculate_max_load(); } //////////////////////////////////////////////////////////////////////// // Constructors table() : functions(hasher(), key_equal()), size_(0), mlf_(1.0f), max_load_(0) { } table(std::size_t num_buckets, hasher const& hf, key_equal const& eq, node_allocator_type const& a) : functions(hf, eq), size_(0), mlf_(1.0f), max_load_(0), buckets_(num_buckets, a) { recalculate_max_load(); } table(table const& x, node_allocator_type const& a) : functions(x), size_(0), mlf_(x.mlf_), max_load_(0), buckets_(x.size_, a) { recalculate_max_load(); } table(table& x, boost::unordered::detail::move_tag m) : functions(x, m), size_(x.size_), mlf_(x.mlf_), max_load_(x.max_load_), buckets_(boost::move(x.buckets_)) { x.size_ = 0; x.max_load_ = 0; } table(table& x, node_allocator_type const& a, boost::unordered::detail::move_tag m) : functions(x, m), size_(0), mlf_(x.mlf_), max_load_(0), buckets_(x.bucket_count(), a) { recalculate_max_load(); } //////////////////////////////////////////////////////////////////////// // Swap and Move void swap_allocators(table& other, false_type) { boost::unordered::detail::func::ignore_unused_variable_warning(other); // According to 23.2.1.8, if propagate_on_container_swap is // false the behaviour is undefined unless the allocators // are equal. BOOST_ASSERT(node_alloc() == other.node_alloc()); } // Not nothrow swappable void swap(table& x, false_type) { if (this == &x) { return; } this->construct_spare_functions(x.current_functions()); BOOST_TRY { x.construct_spare_functions(this->current_functions()); } BOOST_CATCH(...) { this->cleanup_spare_functions(); BOOST_RETHROW } BOOST_CATCH_END this->switch_functions(); x.switch_functions(); buckets_.swap(x.buckets_); boost::swap(size_, x.size_); std::swap(mlf_, x.mlf_); std::swap(max_load_, x.max_load_); } // Nothrow swappable void swap(table& x, true_type) { buckets_.swap(x.buckets_); boost::swap(size_, x.size_); std::swap(mlf_, x.mlf_); std::swap(max_load_, x.max_load_); this->current_functions().swap(x.current_functions()); } // Only swaps the allocators if propagate_on_container_swap. // If not propagate_on_container_swap and allocators aren't // equal, behaviour is undefined. void swap(table& x) { BOOST_ASSERT(boost::allocator_propagate_on_container_swap< node_allocator_type>::type::value || node_alloc() == x.node_alloc()); swap(x, boost::unordered::detail::integral_constant<bool, functions::nothrow_swappable>()); } // Only call with nodes allocated with the currect allocator, or // one that is equal to it. (Can't assert because other's // allocators might have already been moved). void move_buckets_from(table& other) { buckets_ = boost::move(other.buckets_); size_ = other.size_; max_load_ = other.max_load_; other.size_ = 0; other.max_load_ = 0; } // For use in the constructor when allocators might be different. void move_construct_buckets(table& src) { if (this->node_alloc() == src.node_alloc()) { move_buckets_from(src); return; } if (src.size_ == 0) { return; } BOOST_ASSERT( buckets_.bucket_count() == src.buckets_.bucket_count()); this->reserve(src.size_); for (iterator pos = src.begin(); pos != src.end(); ++pos) { node_tmp b(detail::func::construct_node( this->node_alloc(), boost::move(pos.p->value())), this->node_alloc()); const_key_type& k = this->get_key(b.node_); std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); buckets_.insert_node(itb, b.release()); ++size_; } } //////////////////////////////////////////////////////////////////////// // Delete/destruct ~table() { delete_buckets(); } void delete_node(node_pointer p) { node_allocator_type alloc = this->node_alloc(); value_allocator val_alloc(alloc); boost::allocator_destroy(val_alloc, p->value_ptr()); boost::allocator_deallocate(alloc, p, 1); } void delete_buckets() { iterator pos = begin(), last = this->end(); for (; pos != last;) { node_pointer p = pos.p; bucket_iterator itb = pos.itb; ++pos; buckets_.extract_node(itb, p); delete_node(p); --size_; } buckets_.clear(); } //////////////////////////////////////////////////////////////////////// // Clear void clear_impl(); //////////////////////////////////////////////////////////////////////// // Assignment template <typename UniqueType> void assign(table const& x, UniqueType is_unique) { typedef typename boost::allocator_propagate_on_container_copy_assignment<node_allocator_type>::type pocca; if (this != &x) { assign(x, is_unique, boost::unordered::detail::integral_constant<bool, pocca::value>()); } } template <typename UniqueType> void assign(table const &x, UniqueType is_unique, false_type) { // Strong exception safety. this->construct_spare_functions(x.current_functions()); BOOST_TRY { mlf_ = x.mlf_; recalculate_max_load(); this->reserve_for_insert(x.size_); this->clear_impl(); } BOOST_CATCH(...) { this->cleanup_spare_functions(); BOOST_RETHROW } BOOST_CATCH_END this->switch_functions(); copy_buckets(x, is_unique); } template <typename UniqueType> void assign(table const &x, UniqueType is_unique, true_type) { if (node_alloc() == x.node_alloc()) { buckets_.reset_allocator(x.node_alloc()); assign(x, is_unique, false_type()); } else { bucket_array_type new_buckets(x.size_, x.node_alloc()); this->construct_spare_functions(x.current_functions()); this->switch_functions(); // Delete everything with current allocators before assigning // the new ones. delete_buckets(); buckets_.reset_allocator(x.node_alloc()); buckets_ = boost::move(new_buckets); // Copy over other data, all no throw. mlf_ = x.mlf_; reserve(x.size_); // Finally copy the elements. if (x.size_) { copy_buckets(x, is_unique); } } } template <typename UniqueType> void move_assign(table& x, UniqueType is_unique) { if (this != &x) { move_assign(x, is_unique, boost::unordered::detail::integral_constant<bool, boost::allocator_propagate_on_container_move_assignment< node_allocator_type>::type::value>()); } } // Propagate allocator template <typename UniqueType> void move_assign(table& x, UniqueType, true_type) { if (!functions::nothrow_move_assignable) { this->construct_spare_functions(x.current_functions()); this->switch_functions(); } else { this->current_functions().move_assign(x.current_functions()); } delete_buckets(); buckets_.reset_allocator(x.buckets_.get_node_allocator()); mlf_ = x.mlf_; move_buckets_from(x); } // Don't propagate allocator template <typename UniqueType> void move_assign(table& x, UniqueType is_unique, false_type) { if (node_alloc() == x.node_alloc()) { move_assign_equal_alloc(x); } else { move_assign_realloc(x, is_unique); } } void move_assign_equal_alloc(table& x) { if (!functions::nothrow_move_assignable) { this->construct_spare_functions(x.current_functions()); this->switch_functions(); } else { this->current_functions().move_assign(x.current_functions()); } delete_buckets(); mlf_ = x.mlf_; move_buckets_from(x); } template <typename UniqueType> void move_assign_realloc(table& x, UniqueType is_unique) { this->construct_spare_functions(x.current_functions()); BOOST_TRY { mlf_ = x.mlf_; recalculate_max_load(); if (x.size_ > 0) { this->reserve_for_insert(x.size_); } this->clear_impl(); } BOOST_CATCH(...) { this->cleanup_spare_functions(); BOOST_RETHROW } BOOST_CATCH_END this->switch_functions(); move_assign_buckets(x, is_unique); } // Accessors const_key_type& get_key(node_pointer n) const { return extractor::extract(n->value()); } template <class Key> std::size_t hash(Key const& k) const { return this->hash_function()(k); } // Find Node template <class Key> node_pointer find_node_impl( Key const& x, bucket_iterator itb) const { node_pointer p = node_pointer(); if (itb != buckets_.end()) { key_equal const& pred = this->key_eq(); p = itb->next; for (; p; p = p->next) { if (pred(x, extractor::extract(p->value()))) { break; } } } return p; } template <class Key> node_pointer find_node(Key const& k) const { std::size_t const key_hash = this->hash(k); return find_node_impl( k, buckets_.at(buckets_.position(key_hash))); } node_pointer find_node( const_key_type& k, bucket_iterator itb) const { return find_node_impl(k, itb); } template <class Key> iterator find(Key const& k) const { return this->transparent_find( k, this->hash_function(), this->key_eq()); } template <class Key, class Hash, class Pred> inline iterator transparent_find( Key const& k, Hash const& h, Pred const& pred) const { if (size_ > 0) { std::size_t const key_hash = h(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); for (node_pointer p = itb->next; p; p = p->next) { if (BOOST_LIKELY(pred(k, extractor::extract(p->value())))) { return iterator(p, itb); } } } return this->end(); } template <class Key> node_pointer* find_prev(Key const& key, bucket_iterator itb) { if (size_ > 0) { key_equal pred = this->key_eq(); for (node_pointer* pp = boost::addressof(itb->next); *pp; pp = boost::addressof((*pp)->next)) { if (pred(key, extractor::extract((*pp)->value()))) { return pp; } } } typedef node_pointer* node_pointer_pointer; return node_pointer_pointer(); } // Extract and erase template <class Key> node_pointer extract_by_key_impl(Key const& k) { iterator it = this->find(k); if (it == this->end()) { return node_pointer(); } buckets_.extract_node(it.itb, it.p); --size_; return it.p; } // Reserve and rehash void transfer_node( node_pointer p, bucket_type&, bucket_array_type& new_buckets) { const_key_type& key = extractor::extract(p->value()); std::size_t const h = this->hash(key); bucket_iterator itnewb = new_buckets.at(new_buckets.position(h)); new_buckets.insert_node(itnewb, p); } static std::size_t min_buckets(std::size_t num_elements, float mlf) { std::size_t num_buckets = static_cast<std::size_t>( std::ceil(static_cast<float>(num_elements) / mlf)); if (num_buckets == 0 && num_elements > 0) { // mlf == inf num_buckets = 1; } return num_buckets; } void rehash(std::size_t); void reserve(std::size_t); void reserve_for_insert(std::size_t); void rehash_impl(std::size_t); //////////////////////////////////////////////////////////////////////// // Unique keys // equals bool equals_unique(table const& other) const { if (this->size_ != other.size_) return false; c_iterator pos = this->begin(); c_iterator last = this->end(); while (pos != last) { node_pointer p = pos.p; node_pointer p2 = other.find_node(this->get_key(p)); if (!p2 || !(p->value() == p2->value())) { return false; } ++pos; } return true; } // Emplace/Insert template <BOOST_UNORDERED_EMPLACE_TEMPLATE> iterator emplace_hint_unique( c_iterator hint, const_key_type& k, BOOST_UNORDERED_EMPLACE_ARGS) { if (hint.p && this->key_eq()(k, this->get_key(hint.p))) { return iterator(hint.p, hint.itb); } else { return emplace_unique(k, BOOST_UNORDERED_EMPLACE_FORWARD).first; } } template <BOOST_UNORDERED_EMPLACE_TEMPLATE> emplace_return emplace_unique( const_key_type& k, BOOST_UNORDERED_EMPLACE_ARGS) { std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer pos = this->find_node_impl(k, itb); if (pos) { return emplace_return(iterator(pos, itb), false); } else { node_tmp b(boost::unordered::detail::func::construct_node_from_args( this->node_alloc(), BOOST_UNORDERED_EMPLACE_FORWARD), this->node_alloc()); if (size_ + 1 > max_load_) { reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } node_pointer p = b.release(); buckets_.insert_node(itb, p); ++size_; return emplace_return(iterator(p, itb), true); } } template <BOOST_UNORDERED_EMPLACE_TEMPLATE> iterator emplace_hint_unique( c_iterator hint, no_key, BOOST_UNORDERED_EMPLACE_ARGS) { node_tmp b(boost::unordered::detail::func::construct_node_from_args( this->node_alloc(), BOOST_UNORDERED_EMPLACE_FORWARD), this->node_alloc()); const_key_type& k = this->get_key(b.node_); if (hint.p && this->key_eq()(k, this->get_key(hint.p))) { return iterator(hint.p, hint.itb); } std::size_t const key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer p = this->find_node_impl(k, itb); if (p) { return iterator(p, itb); } if (size_ + 1 > max_load_) { this->reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } p = b.release(); buckets_.insert_node(itb, p); ++size_; return iterator(p, itb); } template <BOOST_UNORDERED_EMPLACE_TEMPLATE> emplace_return emplace_unique(no_key, BOOST_UNORDERED_EMPLACE_ARGS) { node_tmp b(boost::unordered::detail::func::construct_node_from_args( this->node_alloc(), BOOST_UNORDERED_EMPLACE_FORWARD), this->node_alloc()); const_key_type& k = this->get_key(b.node_); std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer pos = this->find_node_impl(k, itb); if (pos) { return emplace_return(iterator(pos, itb), false); } else { if (size_ + 1 > max_load_) { reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } node_pointer p = b.release(); buckets_.insert_node(itb, p); ++size_; return emplace_return(iterator(p, itb), true); } } template <typename Key> emplace_return try_emplace_unique(BOOST_FWD_REF(Key) k) { std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer pos = this->find_node_impl(k, itb); if (pos) { return emplace_return(iterator(pos, itb), false); } else { node_allocator_type alloc = node_alloc(); node_tmp tmp( detail::func::construct_node_pair(alloc, boost::forward<Key>(k)), alloc); if (size_ + 1 > max_load_) { reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } node_pointer p = tmp.release(); buckets_.insert_node(itb, p); ++size_; return emplace_return(iterator(p, itb), true); } } template <typename Key> iterator try_emplace_hint_unique(c_iterator hint, BOOST_FWD_REF(Key) k) { if (hint.p && this->key_eq()(hint->first, k)) { return iterator(hint.p, hint.itb); } else { return try_emplace_unique(k).first; } } template <typename Key, BOOST_UNORDERED_EMPLACE_TEMPLATE> emplace_return try_emplace_unique( BOOST_FWD_REF(Key) k, BOOST_UNORDERED_EMPLACE_ARGS) { std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer pos = this->find_node_impl(k, itb); if (pos) { return emplace_return(iterator(pos, itb), false); } node_tmp b( boost::unordered::detail::func::construct_node_pair_from_args( this->node_alloc(), k, BOOST_UNORDERED_EMPLACE_FORWARD), this->node_alloc()); if (size_ + 1 > max_load_) { reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } pos = b.release(); buckets_.insert_node(itb, pos); ++size_; return emplace_return(iterator(pos, itb), true); } template <typename Key, BOOST_UNORDERED_EMPLACE_TEMPLATE> iterator try_emplace_hint_unique( c_iterator hint, BOOST_FWD_REF(Key) k, BOOST_UNORDERED_EMPLACE_ARGS) { if (hint.p && this->key_eq()(hint->first, k)) { return iterator(hint.p, hint.itb); } else { return try_emplace_unique(k, BOOST_UNORDERED_EMPLACE_FORWARD).first; } } template <typename Key, typename M> emplace_return insert_or_assign_unique( BOOST_FWD_REF(Key) k, BOOST_FWD_REF(M) obj) { std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer p = this->find_node_impl(k, itb); if (p) { p->value().second = boost::forward<M>(obj); return emplace_return(iterator(p, itb), false); } node_tmp b(boost::unordered::detail::func::construct_node_pair( this->node_alloc(), boost::forward<Key>(k), boost::forward<M>(obj)), node_alloc()); if (size_ + 1 > max_load_) { reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } p = b.release(); buckets_.insert_node(itb, p); ++size_; return emplace_return(iterator(p, itb), true); } template <typename NodeType, typename InsertReturnType> void move_insert_node_type_unique( NodeType& np, InsertReturnType& result) { if (!np) { result.position = this->end(); result.inserted = false; return; } const_key_type& k = this->get_key(np.ptr_); std::size_t const key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer p = this->find_node_impl(k, itb); if (p) { iterator pos(p, itb); result.node = boost::move(np); result.position = pos; result.inserted = false; return; } this->reserve_for_insert(size_ + 1); p = np.ptr_; itb = buckets_.at(buckets_.position(key_hash)); buckets_.insert_node(itb, p); np.ptr_ = node_pointer(); ++size_; result.position = iterator(p, itb); result.inserted = true; } template <typename NodeType> iterator move_insert_node_type_with_hint_unique( c_iterator hint, NodeType& np) { if (!np) { return this->end(); } const_key_type& k = this->get_key(np.ptr_); if (hint.p && this->key_eq()(k, this->get_key(hint.p))) { return iterator(hint.p, hint.itb); } std::size_t const key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer p = this->find_node_impl(k, itb); if (p) { return iterator(p, itb); } p = np.ptr_; if (size_ + 1 > max_load_) { this->reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } buckets_.insert_node(itb, p); ++size_; np.ptr_ = node_pointer(); return iterator(p, itb); } template <typename Types2> void merge_unique(boost::unordered::detail::table<Types2>& other) { typedef boost::unordered::detail::table<Types2> other_table; BOOST_STATIC_ASSERT((boost::is_same<node_type, typename other_table::node_type>::value)); BOOST_ASSERT(this->node_alloc() == other.node_alloc()); if (other.size_ == 0) { return; } this->reserve_for_insert(size_ + other.size_); iterator last = other.end(); for (iterator pos = other.begin(); pos != last;) { const_key_type& key = other.get_key(pos.p); std::size_t const key_hash = this->hash(key); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); if (this->find_node_impl(key, itb)) { ++pos; continue; } iterator old = pos; ++pos; node_pointer p = other.extract_by_iterator_unique(old); buckets_.insert_node(itb, p); ++size_; } } //////////////////////////////////////////////////////////////////////// // Insert range methods // // if hash function throws, or inserting > 1 element, basic exception // safety strong otherwise template <class InputIt> void insert_range_unique(no_key, InputIt i, InputIt j) { hasher const& hf = this->hash_function(); node_allocator_type alloc = this->node_alloc(); for (; i != j; ++i) { node_tmp tmp(detail::func::construct_node(alloc, *i), alloc); value_type const& value = tmp.node_->value(); const_key_type& key = extractor::extract(value); std::size_t const h = hf(key); bucket_iterator itb = buckets_.at(buckets_.position(h)); node_pointer it = find_node_impl(key, itb); if (it) { continue; } if (size_ + 1 > max_load_) { reserve(size_ + 1); itb = buckets_.at(buckets_.position(h)); } node_pointer nptr = tmp.release(); buckets_.insert_node(itb, nptr); ++size_; } } //////////////////////////////////////////////////////////////////////// // Extract inline node_pointer extract_by_iterator_unique(c_iterator i) { node_pointer p = i.p; bucket_iterator itb = i.itb; buckets_.extract_node(itb, p); --size_; return p; } //////////////////////////////////////////////////////////////////////// // Erase // template <class Key> std::size_t erase_key_unique_impl(Key const& k) { bucket_iterator itb = buckets_.at(buckets_.position(this->hash(k))); node_pointer* pp = this->find_prev(k, itb); if (!pp) { return 0; } node_pointer p = *pp; buckets_.extract_node_after(itb, pp); this->delete_node(p); --size_; return 1; } iterator erase_node(c_iterator pos) { c_iterator next = pos; ++next; bucket_iterator itb = pos.itb; node_pointer* pp = boost::addressof(itb->next); while (*pp != pos.p) { pp = boost::addressof((*pp)->next); } buckets_.extract_node_after(itb, pp); this->delete_node(pos.p); --size_; return iterator(next.p, next.itb); } iterator erase_nodes_range(c_iterator first, c_iterator last) { if (first == last) { return iterator(last.p, last.itb); } // though `first` stores of a copy of a pointer to a node, we wish to // mutate the pointers stored internally by the singly-linked list in // each bucket group so we have to retrieve it manually by iterating // bucket_iterator itb = first.itb; node_pointer* pp = boost::addressof(itb->next); while (*pp != first.p) { pp = boost::addressof((*pp)->next); } while (*pp != last.p) { node_pointer p = *pp; *pp = (*pp)->next; this->delete_node(p); --size_; bool const at_end = !(*pp); bool const is_empty_bucket = !itb->next; if (at_end) { if (is_empty_bucket) { buckets_.unlink_bucket(itb++); } else { ++itb; } pp = boost::addressof(itb->next); } } return iterator(last.p, last.itb); } //////////////////////////////////////////////////////////////////////// // fill_buckets_unique void copy_buckets(table const& src, true_type) { BOOST_ASSERT(size_ == 0); this->reserve_for_insert(src.size_); for (iterator pos = src.begin(); pos != src.end(); ++pos) { value_type const& value = *pos; const_key_type& key = extractor::extract(value); std::size_t const key_hash = this->hash(key); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_allocator_type alloc = this->node_alloc(); node_tmp tmp(detail::func::construct_node(alloc, value), alloc); buckets_.insert_node(itb, tmp.release()); ++size_; } } void move_assign_buckets(table& src, true_type) { BOOST_ASSERT(size_ == 0); BOOST_ASSERT(max_load_ >= src.size_); iterator last = src.end(); node_allocator_type alloc = this->node_alloc(); for (iterator pos = src.begin(); pos != last; ++pos) { value_type value = boost::move(*pos); const_key_type& key = extractor::extract(value); std::size_t const key_hash = this->hash(key); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_tmp tmp( detail::func::construct_node(alloc, boost::move(value)), alloc); buckets_.insert_node(itb, tmp.release()); ++size_; } } //////////////////////////////////////////////////////////////////////// // Equivalent keys // Equality bool equals_equiv(table const& other) const { if (this->size_ != other.size_) return false; iterator last = this->end(); for (iterator n1 = this->begin(); n1 != last;) { const_key_type& k = extractor::extract(*n1); iterator n2 = other.find(k); if (n2 == other.end()) { return false; } iterator end1 = this->next_group(k, n1); iterator end2 = other.next_group(k, n2); if (!group_equals_equiv(n1, end1, n2, end2)) { return false; } n1 = end1; } return true; } static bool group_equals_equiv(iterator n1, iterator end1, iterator n2, iterator end2) { for (;;) { if (*n1 != *n2) break; ++n1; ++n2; if (n1 == end1) return n2 == end2; if (n2 == end2) return false; } for (iterator n1a = n1, n2a = n2;;) { ++n1a; ++n2a; if (n1a == end1) { if (n2a == end2) break; else return false; } if (n2a == end2) return false; } iterator start = n1; for (; n1 != end1; ++n1) { value_type const& v = *n1; if (!find_equiv(start, n1, v)) { std::size_t matches = count_equal_equiv(n2, end2, v); if (!matches) return false; iterator t = n1; if (matches != 1 + count_equal_equiv(++t, end1, v)) return false; } } return true; } static bool find_equiv( iterator n, iterator last, value_type const& v) { for (; n != last; ++n) if (*n == v) return true; return false; } static std::size_t count_equal_equiv( iterator n, iterator last, value_type const& v) { std::size_t count = 0; for (; n != last; ++n) if (*n == v) ++count; return count; } // Emplace/Insert iterator emplace_equiv(node_pointer n) { node_tmp a(n, this->node_alloc()); const_key_type& k = this->get_key(a.node_); std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer hint = this->find_node_impl(k, itb); if (size_ + 1 > max_load_) { this->reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } node_pointer p = a.release(); buckets_.insert_node_hint(itb, p, hint); ++size_; return iterator(p, itb); } iterator emplace_hint_equiv(c_iterator hint, node_pointer n) { node_tmp a(n, this->node_alloc()); const_key_type& k = this->get_key(a.node_); bucket_iterator itb = hint.itb; node_pointer p = hint.p; std::size_t key_hash = 0u; bool const needs_rehash = (size_ + 1 > max_load_); bool const usable_hint = (p && this->key_eq()(k, this->get_key(p))); if (!usable_hint) { key_hash = this->hash(k); itb = buckets_.at(buckets_.position(key_hash)); p = this->find_node_impl(k, itb); } else if (usable_hint && needs_rehash) { key_hash = this->hash(k); } if (needs_rehash) { this->reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } a.release(); buckets_.insert_node_hint(itb, n, p); ++size_; return iterator(n, itb); } void emplace_no_rehash_equiv(node_pointer n) { BOOST_ASSERT(size_ + 1 <= max_load_); node_tmp a(n, this->node_alloc()); const_key_type& k = this->get_key(a.node_); std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer hint = this->find_node_impl(k, itb); node_pointer p = a.release(); buckets_.insert_node_hint(itb, p, hint); ++size_; } template <typename NodeType> iterator move_insert_node_type_equiv(NodeType& np) { iterator result; if (np) { this->reserve_for_insert(size_ + 1); const_key_type& k = this->get_key(np.ptr_); std::size_t key_hash = this->hash(k); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer hint = this->find_node_impl(k, itb); buckets_.insert_node_hint(itb, np.ptr_, hint); ++size_; result = iterator(np.ptr_, itb); np.ptr_ = node_pointer(); } return result; } template <typename NodeType> iterator move_insert_node_type_with_hint_equiv( c_iterator hint, NodeType& np) { iterator result; if (np) { bucket_iterator itb = hint.itb; node_pointer pos = hint.p; const_key_type& k = this->get_key(np.ptr_); std::size_t key_hash = this->hash(k); if (size_ + 1 > max_load_) { this->reserve(size_ + 1); itb = buckets_.at(buckets_.position(key_hash)); } if (hint.p && this->key_eq()(k, this->get_key(hint.p))) { } else { itb = buckets_.at(buckets_.position(key_hash)); pos = this->find_node_impl(k, itb); } buckets_.insert_node_hint(itb, np.ptr_, pos); ++size_; result = iterator(np.ptr_, itb); np.ptr_ = node_pointer(); } return result; } //////////////////////////////////////////////////////////////////////// // Insert range methods // if hash function throws, or inserting > 1 element, basic exception // safety. Strong otherwise template <class I> typename boost::unordered::detail::enable_if_forward<I, void>::type insert_range_equiv(I i, I j) { if (i == j) return; std::size_t distance = static_cast<std::size_t>(std::distance(i, j)); if (distance == 1) { emplace_equiv(boost::unordered::detail::func::construct_node( this->node_alloc(), *i)); } else { // Only require basic exception safety here this->reserve_for_insert(size_ + distance); for (; i != j; ++i) { emplace_no_rehash_equiv( boost::unordered::detail::func::construct_node( this->node_alloc(), *i)); } } } template <class I> typename boost::unordered::detail::disable_if_forward<I, void>::type insert_range_equiv(I i, I j) { for (; i != j; ++i) { emplace_equiv(boost::unordered::detail::func::construct_node( this->node_alloc(), *i)); } } //////////////////////////////////////////////////////////////////////// // Extract inline node_pointer extract_by_iterator_equiv(c_iterator n) { node_pointer p = n.p; bucket_iterator itb = n.itb; buckets_.extract_node(itb, p); --size_; return p; } //////////////////////////////////////////////////////////////////////// // Erase // // no throw template <class Key> std::size_t erase_key_equiv_impl(Key const& k) { std::size_t deleted_count = 0; bucket_iterator itb = buckets_.at(buckets_.position(this->hash(k))); node_pointer* pp = this->find_prev(k, itb); if (pp) { while (*pp && this->key_eq()(this->get_key(*pp), k)) { node_pointer p = *pp; *pp = (*pp)->next; this->delete_node(p); --size_; ++deleted_count; } if (!itb->next) { buckets_.unlink_bucket(itb); } } return deleted_count; } std::size_t erase_key_equiv(const_key_type& k) { return this->erase_key_equiv_impl(k); } //////////////////////////////////////////////////////////////////////// // fill_buckets void copy_buckets(table const& src, false_type) { BOOST_ASSERT(size_ == 0); this->reserve_for_insert(src.size_); iterator last = src.end(); for (iterator pos = src.begin(); pos != last; ++pos) { value_type const& value = *pos; const_key_type& key = extractor::extract(value); std::size_t const key_hash = this->hash(key); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_allocator_type alloc = this->node_alloc(); node_tmp tmp(detail::func::construct_node(alloc, value), alloc); node_pointer hint = this->find_node_impl(key, itb); buckets_.insert_node_hint(itb, tmp.release(), hint); ++size_; } } void move_assign_buckets(table& src, false_type) { BOOST_ASSERT(size_ == 0); BOOST_ASSERT(max_load_ >= src.size_); iterator last = src.end(); node_allocator_type alloc = this->node_alloc(); for (iterator pos = src.begin(); pos != last; ++pos) { value_type value = boost::move(*pos); const_key_type& key = extractor::extract(value); std::size_t const key_hash = this->hash(key); bucket_iterator itb = buckets_.at(buckets_.position(key_hash)); node_pointer hint = this->find_node_impl(key, itb); node_tmp tmp( detail::func::construct_node(alloc, boost::move(value)), alloc); buckets_.insert_node_hint(itb, tmp.release(), hint); ++size_; } } }; ////////////////////////////////////////////////////////////////////////// // Clear template <typename Types> inline void table<Types>::clear_impl() { bucket_iterator itb = buckets_.begin(), last = buckets_.end(); for (; itb != last;) { bucket_iterator next_itb = itb; ++next_itb; node_pointer* pp = boost::addressof(itb->next); while (*pp) { node_pointer p = *pp; buckets_.extract_node_after(itb, pp); this->delete_node(p); --size_; } itb = next_itb; } } ////////////////////////////////////////////////////////////////////////// // Reserve & Rehash // if hash function throws, basic exception safety // strong otherwise. template <typename Types> inline void table<Types>::rehash(std::size_t num_buckets) { num_buckets = buckets_.bucket_count_for( (std::max)(min_buckets(size_, mlf_), num_buckets)); if (num_buckets != this->bucket_count()) { this->rehash_impl(num_buckets); } } template <class Types> inline void table<Types>::reserve(std::size_t num_elements) { std::size_t num_buckets = min_buckets(num_elements, mlf_); this->rehash(num_buckets); } template <class Types> inline void table<Types>::reserve_for_insert(std::size_t num_elements) { if (num_elements > max_load_) { std::size_t const num_buckets = static_cast<std::size_t>( 1.0f + std::ceil(static_cast<float>(num_elements) / mlf_)); this->rehash_impl(num_buckets); } } template <class Types> inline void table<Types>::rehash_impl(std::size_t num_buckets) { bucket_array_type new_buckets( num_buckets, buckets_.get_node_allocator()); BOOST_TRY { boost::unordered::detail::span<bucket_type> bspan = buckets_.raw(); bucket_type* pos = bspan.data; std::size_t size = bspan.size; bucket_type* last = pos + size; for (; pos != last; ++pos) { bucket_type& b = *pos; for (node_pointer p = b.next; p;) { node_pointer next_p = p->next; transfer_node(p, b, new_buckets); p = next_p; b.next = p; } } } BOOST_CATCH(...) { for (bucket_iterator pos = new_buckets.begin(); pos != new_buckets.end(); ++pos) { bucket_type& b = *pos; for (node_pointer p = b.next; p;) { node_pointer next_p = p->next; delete_node(p); --size_; p = next_p; } } buckets_.unlink_empty_buckets(); BOOST_RETHROW; } BOOST_CATCH_END buckets_ = boost::move(new_buckets); recalculate_max_load(); } #if defined(BOOST_MSVC) #pragma warning(pop) #endif //////////////////////////////////////////////////////////////////////// // key extractors // // no throw // // 'extract_key' is called with the emplace parameters to return a // key if available or 'no_key' is one isn't and will need to be // constructed. This could be done by overloading the emplace // implementation // for the different cases, but that's a bit tricky on compilers without // variadic templates. template <typename Key, typename T> struct is_key { template <typename T2> static choice1::type test(T2 const&); static choice2::type test(Key const&); enum { value = sizeof(test(boost::unordered::detail::make<T>())) == sizeof(choice2::type) }; typedef typename boost::conditional<value, Key const&, no_key>::type type; }; template <class ValueType> struct set_extractor { typedef ValueType value_type; typedef ValueType key_type; static key_type const& extract(value_type const& v) { return v; } static key_type const& extract(BOOST_UNORDERED_RV_REF(value_type) v) { return v; } static no_key extract() { return no_key(); } template <class Arg> static no_key extract(Arg const&) { return no_key(); } #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) template <class Arg1, class Arg2, class... Args> static no_key extract(Arg1 const&, Arg2 const&, Args const&...) { return no_key(); } #else template <class Arg1, class Arg2> static no_key extract(Arg1 const&, Arg2 const&) { return no_key(); } #endif }; template <class ValueType> struct map_extractor { typedef ValueType value_type; typedef typename boost::remove_const<typename boost::unordered::detail:: pair_traits<ValueType>::first_type>::type key_type; static key_type const& extract(value_type const& v) { return v.first; } template <class Second> static key_type const& extract(std::pair<key_type, Second> const& v) { return v.first; } template <class Second> static key_type const& extract( std::pair<key_type const, Second> const& v) { return v.first; } #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) template <class Second> static key_type const& extract( boost::rv<std::pair<key_type, Second> > const& v) { return v.first; } template <class Second> static key_type const& extract( boost::rv<std::pair<key_type const, Second> > const& v) { return v.first; } #endif template <class Arg1> static key_type const& extract(key_type const& k, Arg1 const&) { return k; } static no_key extract() { return no_key(); } template <class Arg> static no_key extract(Arg const&) { return no_key(); } template <class Arg1, class Arg2> static no_key extract(Arg1 const&, Arg2 const&) { return no_key(); } #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) template <class Arg1, class Arg2, class Arg3, class... Args> static no_key extract( Arg1 const&, Arg2 const&, Arg3 const&, Args const&...) { return no_key(); } #endif #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) #define BOOST_UNORDERED_KEY_FROM_TUPLE(namespace_) \ template <typename T2> \ static no_key extract(boost::unordered::piecewise_construct_t, \ namespace_ tuple<> const&, T2 const&) \ { \ return no_key(); \ } \ \ template <typename T, typename T2> \ static typename is_key<key_type, T>::type extract( \ boost::unordered::piecewise_construct_t, namespace_ tuple<T> const& k, \ T2 const&) \ { \ return typename is_key<key_type, T>::type(namespace_ get<0>(k)); \ } #else #define BOOST_UNORDERED_KEY_FROM_TUPLE(namespace_) \ static no_key extract( \ boost::unordered::piecewise_construct_t, namespace_ tuple<> const&) \ { \ return no_key(); \ } \ \ template <typename T> \ static typename is_key<key_type, T>::type extract( \ boost::unordered::piecewise_construct_t, namespace_ tuple<T> const& k) \ { \ return typename is_key<key_type, T>::type(namespace_ get<0>(k)); \ } #endif BOOST_UNORDERED_KEY_FROM_TUPLE(boost::) #if BOOST_UNORDERED_TUPLE_ARGS BOOST_UNORDERED_KEY_FROM_TUPLE(std::) #endif #undef BOOST_UNORDERED_KEY_FROM_TUPLE }; template <class Container, class Predicate> typename Container::size_type erase_if(Container& c, Predicate& pred) { typedef typename Container::size_type size_type; typedef typename Container::iterator iterator; size_type const size = c.size(); for (iterator pos = c.begin(), last = c.end(); pos != last;) { if (pred(*pos)) { pos = c.erase(pos); } else { ++pos; } } return (size - c.size()); } } } } #undef BOOST_UNORDERED_EMPLACE_TEMPLATE #undef BOOST_UNORDERED_EMPLACE_ARGS #undef BOOST_UNORDERED_EMPLACE_FORWARD #endif