boost/intrusive/options.hpp
/////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2007-2013
//
// 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)
//
// See http://www.boost.org/libs/intrusive for documentation.
//
/////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTRUSIVE_OPTIONS_HPP
#define BOOST_INTRUSIVE_OPTIONS_HPP
#include <boost/intrusive/detail/config_begin.hpp>
#include <boost/intrusive/intrusive_fwd.hpp>
#include <boost/intrusive/link_mode.hpp>
#include <boost/intrusive/pack_options.hpp>
#include <boost/intrusive/detail/mpl.hpp>
#include <boost/intrusive/detail/utilities.hpp>
#include <boost/static_assert.hpp>
namespace boost {
namespace intrusive {
#ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//typedef void default_tag;
struct default_tag;
struct member_tag;
namespace detail{
struct default_hook_tag{};
#define BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER) \
struct BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER : public default_hook_tag\
{\
template <class T>\
struct apply\
{ typedef typename T::BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER type; };\
}\
BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(default_list_hook);
BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(default_slist_hook);
BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(default_rbtree_hook);
BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(default_hashtable_hook);
BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(default_avltree_hook);
BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION(default_bstree_hook);
#undef BOOST_INTRUSIVE_DEFAULT_HOOK_MARKER_DEFINITION
template <class T, class BaseHook>
struct concrete_hook_base_value_traits
{
typedef typename BaseHook::hooktags tags;
typedef bhtraits
< T
, typename tags::node_traits
, tags::link_mode
, typename tags::tag
, tags::type> type;
};
template <class BaseHook>
struct concrete_hook_base_node_traits
{ typedef typename BaseHook::hooktags::node_traits type; };
template <class T, class AnyToSomeHook_ProtoValueTraits>
struct any_hook_base_value_traits
{
//AnyToSomeHook value_traits derive from a generic_hook
//The generic_hook is configured with any_node_traits
//and AnyToSomeHook::value_traits with the correct
//node traits for the container, so use node_traits
//from AnyToSomeHook_ProtoValueTraits and the rest of
//elements from the hooktags member of the generic_hook
typedef AnyToSomeHook_ProtoValueTraits proto_value_traits;
typedef bhtraits
< T
, typename proto_value_traits::node_traits
, proto_value_traits::hooktags::link_mode
, typename proto_value_traits::hooktags::tag
, proto_value_traits::hooktags::type
> type;
};
template <class BaseHook>
struct any_hook_base_node_traits
{ typedef typename BaseHook::node_traits type; };
template<class T, class BaseHook>
struct get_base_value_traits
{
typedef typename detail::eval_if_c
< internal_any_hook_bool_is_true<BaseHook>::value
, any_hook_base_value_traits<T, BaseHook>
, concrete_hook_base_value_traits<T, BaseHook>
>::type type;
};
template<class BaseHook>
struct get_base_node_traits
{
typedef typename detail::eval_if_c
< internal_any_hook_bool_is_true<BaseHook>::value
, any_hook_base_node_traits<BaseHook>
, concrete_hook_base_node_traits<BaseHook>
>::type type;
};
template<class T, class MemberHook>
struct get_member_value_traits
{
typedef typename MemberHook::member_value_traits type;
};
template<class MemberHook>
struct get_member_node_traits
{
typedef typename MemberHook::member_value_traits::node_traits type;
};
template<class T, class SupposedValueTraits>
struct get_value_traits
{
typedef typename detail::eval_if_c
<detail::is_convertible<SupposedValueTraits*, detail::default_hook_tag*>::value
,detail::apply<SupposedValueTraits, T>
,detail::identity<SupposedValueTraits>
>::type supposed_value_traits;
//...if it's a default hook
typedef typename detail::eval_if_c
< internal_base_hook_bool_is_true<supposed_value_traits>::value
//...get it's internal value traits using
//the provided T value type.
, get_base_value_traits<T, supposed_value_traits>
//...else use its internal value traits tag
//(member hooks and custom value traits are in this group)
, detail::eval_if_c
< internal_member_value_traits<supposed_value_traits>::value
, get_member_value_traits<T, supposed_value_traits>
, detail::identity<supposed_value_traits>
>
>::type type;
};
template<class ValueTraits>
struct get_explicit_node_traits
{
typedef typename ValueTraits::node_traits type;
};
template<class SupposedValueTraits>
struct get_node_traits
{
typedef SupposedValueTraits supposed_value_traits;
//...if it's a base hook
typedef typename detail::eval_if_c
< internal_base_hook_bool_is_true<supposed_value_traits>::value
//...get it's internal value traits using
//the provided T value type.
, get_base_node_traits<supposed_value_traits>
//...else use its internal value traits tag
//(member hooks and custom value traits are in this group)
, detail::eval_if_c
< internal_member_value_traits<supposed_value_traits>::value
, get_member_node_traits<supposed_value_traits>
, get_explicit_node_traits<supposed_value_traits>
>
>::type type;
};
} //namespace detail{
#endif //BOOST_INTRUSIVE_DOXYGEN_INVOKED
//!This option setter specifies if the intrusive
//!container stores its size as a member to
//!obtain constant-time size() member.
BOOST_INTRUSIVE_OPTION_CONSTANT(constant_time_size, bool, Enabled, constant_time_size)
//!This option setter specifies a container header holder type
BOOST_INTRUSIVE_OPTION_TYPE(header_holder_type, HeaderHolder, HeaderHolder, header_holder_type)
//!This option setter specifies the type that
//!the container will use to store its size.
BOOST_INTRUSIVE_OPTION_TYPE(size_type, SizeType, SizeType, size_type)
//!This option setter specifies the strict weak ordering
//!comparison functor for the value type
BOOST_INTRUSIVE_OPTION_TYPE(compare, Compare, Compare, compare)
//!This option setter for scapegoat containers specifies if
//!the intrusive scapegoat container should use a non-variable
//!alpha value that does not need floating-point operations.
//!
//!If activated, the fixed alpha value is 1/sqrt(2). This
//!option also saves some space in the container since
//!the alpha value and some additional data does not need
//!to be stored in the container.
//!
//!If the user only needs an alpha value near 1/sqrt(2), this
//!option also improves performance since avoids logarithm
//!and division operations when rebalancing the tree.
BOOST_INTRUSIVE_OPTION_CONSTANT(floating_point, bool, Enabled, floating_point)
//!This option setter specifies the equality
//!functor for the value type
BOOST_INTRUSIVE_OPTION_TYPE(equal, Equal, Equal, equal)
//!This option setter specifies the equality
//!functor for the value type
BOOST_INTRUSIVE_OPTION_TYPE(priority, Priority, Priority, priority)
//!This option setter specifies the hash
//!functor for the value type
BOOST_INTRUSIVE_OPTION_TYPE(hash, Hash, Hash, hash)
//!This option setter specifies the relationship between the type
//!to be managed by the container (the value type) and the node to be
//!used in the node algorithms. It also specifies the linking policy.
BOOST_INTRUSIVE_OPTION_TYPE(value_traits, ValueTraits, ValueTraits, proto_value_traits)
//#define BOOST_INTRUSIVE_COMMA ,
//#define BOOST_INTRUSIVE_LESS <
//#define BOOST_INTRUSIVE_MORE >
//BOOST_INTRUSIVE_OPTION_TYPE (member_hook, Parent BOOST_INTRUSIVE_COMMA class MemberHook BOOST_INTRUSIVE_COMMA MemberHook Parent::* PtrToMember , mhtraits BOOST_INTRUSIVE_LESS Parent BOOST_INTRUSIVE_COMMA MemberHook BOOST_INTRUSIVE_COMMA PtrToMember BOOST_INTRUSIVE_MORE , proto_value_traits)
//template< class Parent , class MemberHook , MemberHook Parent::* PtrToMember>
//struct member_hook {
// template<class Base> struct pack : Base {
// typedef mhtraits < Parent , MemberHook , PtrToMember > proto_value_traits;
// };
//};
//
//#undef BOOST_INTRUSIVE_COMMA
//#undef BOOST_INTRUSIVE_LESS
//#undef BOOST_INTRUSIVE_MORE
//!This option setter specifies the member hook the
//!container must use.
template< typename Parent
, typename MemberHook
, MemberHook Parent::* PtrToMember>
struct member_hook
{
// @cond
// typedef typename MemberHook::hooktags::node_traits node_traits;
// typedef typename node_traits::node node_type;
// typedef node_type Parent::* Ptr2MemNode;
// typedef mhtraits
// < Parent
// , node_traits
// //This cast is really ugly but necessary to reduce template bloat.
// //Since we control the layout between the hook and the node, and there is
// //always single inheritance, the offset of the node is exactly the offset of
// //the hook. Since the node type is shared between all member hooks, this saves
// //quite a lot of symbol stuff.
// , (Ptr2MemNode)PtrToMember
// , MemberHook::hooktags::link_mode> member_value_traits;
typedef mhtraits <Parent, MemberHook, PtrToMember> member_value_traits;
template<class Base>
struct pack : Base
{
typedef member_value_traits proto_value_traits;
};
/// @endcond
};
//!This option setter specifies the function object that will
//!be used to convert between values to be inserted in a container
//!and the hook to be used for that purpose.
BOOST_INTRUSIVE_OPTION_TYPE(function_hook, Functor, fhtraits<Functor>, proto_value_traits)
//!This option setter specifies that the container
//!must use the specified base hook
BOOST_INTRUSIVE_OPTION_TYPE(base_hook, BaseHook, BaseHook, proto_value_traits)
//!This option setter specifies the type of
//!a void pointer. This will instruct the hook
//!to use this type of pointer instead of the
//!default one
BOOST_INTRUSIVE_OPTION_TYPE(void_pointer, VoidPointer, VoidPointer, void_pointer)
//!This option setter specifies the type of
//!the tag of a base hook. A type cannot have two
//!base hooks of the same type, so a tag can be used
//!to differentiate two base hooks with otherwise same type
BOOST_INTRUSIVE_OPTION_TYPE(tag, Tag, Tag, tag)
//!This option setter specifies the link mode
//!(normal_link, safe_link or auto_unlink)
BOOST_INTRUSIVE_OPTION_CONSTANT(link_mode, link_mode_type, LinkType, link_mode)
//!This option setter specifies if the hook
//!should be optimized for size instead of for speed.
BOOST_INTRUSIVE_OPTION_CONSTANT(optimize_size, bool, Enabled, optimize_size)
//!This option setter specifies if the slist container should
//!use a linear implementation instead of a circular one.
BOOST_INTRUSIVE_OPTION_CONSTANT(linear, bool, Enabled, linear)
//!If true, slist also stores a pointer to the last element of the singly linked list.
//!This allows O(1) swap and splice_after(iterator, slist &) for circular slists and makes
//!possible new functions like push_back(reference) and back().
BOOST_INTRUSIVE_OPTION_CONSTANT(cache_last, bool, Enabled, cache_last)
//!This option setter specifies the bucket traits
//!class for unordered associative containers. When this option is specified,
//!instead of using the default bucket traits, a user defined holder will be defined
BOOST_INTRUSIVE_OPTION_TYPE(bucket_traits, BucketTraits, BucketTraits, bucket_traits)
//!This option setter specifies if the unordered hook
//!should offer room to store the hash value.
//!Storing the hash in the hook will speed up rehashing
//!processes in applications where rehashing is frequent,
//!rehashing might throw or the value is heavy to hash.
BOOST_INTRUSIVE_OPTION_CONSTANT(store_hash, bool, Enabled, store_hash)
//!This option setter specifies if the unordered hook
//!should offer room to store another link to another node
//!with the same key.
//!Storing this link will speed up lookups and insertions on
//!unordered_multiset containers with a great number of elements
//!with the same key.
BOOST_INTRUSIVE_OPTION_CONSTANT(optimize_multikey, bool, Enabled, optimize_multikey)
//!This option setter specifies if the bucket array will be always power of two.
//!This allows using masks instead of the default modulo operation to determine
//!the bucket number from the hash value, leading to better performance.
//!In debug mode, if power of two buckets mode is activated, the bucket length
//!will be checked to through assertions to assure the bucket length is power of two.
BOOST_INTRUSIVE_OPTION_CONSTANT(power_2_buckets, bool, Enabled, power_2_buckets)
//!This option setter specifies if the container will cache a pointer to the first
//!non-empty bucket so that begin() is always constant-time.
//!This is specially helpful when we can have containers with a few elements
//!but with big bucket arrays (that is, hashtables with low load factors).
BOOST_INTRUSIVE_OPTION_CONSTANT(cache_begin, bool, Enabled, cache_begin)
//!This option setter specifies if the container will compare the hash value
//!before comparing objects. This option can't be specified if store_hash<>
//!is not true.
//!This is specially helpful when we have containers with a high load factor.
//!and the comparison function is much more expensive that comparing already
//!stored hash values.
BOOST_INTRUSIVE_OPTION_CONSTANT(compare_hash, bool, Enabled, compare_hash)
//!This option setter specifies if the hash container will use incremental
//!hashing. With incremental hashing the cost of hash table expansion is spread
//!out across each hash table insertion operation, as opposed to be incurred all at once.
//!Therefore linear hashing is well suited for interactive applications or real-time
//!appplications where the worst-case insertion time of non-incremental hash containers
//!(rehashing the whole bucket array) is not admisible.
BOOST_INTRUSIVE_OPTION_CONSTANT(incremental, bool, Enabled, incremental)
/// @cond
struct none
{
template<class Base>
struct pack : Base
{};
};
struct hook_defaults
{
typedef void* void_pointer;
static const link_mode_type link_mode = safe_link;
typedef default_tag tag;
static const bool optimize_size = false;
static const bool store_hash = false;
static const bool linear = false;
static const bool optimize_multikey = false;
};
/// @endcond
} //namespace intrusive {
} //namespace boost {
#include <boost/intrusive/detail/config_end.hpp>
#endif //#ifndef BOOST_INTRUSIVE_OPTIONS_HPP