boost/lexical_cast/detail/converter_lexical_streams.hpp
// Copyright Kevlin Henney, 2000-2005. // Copyright Alexander Nasonov, 2006-2010. // Copyright Antony Polukhin, 2011-2019. // // 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) // // what: lexical_cast custom keyword cast // who: contributed by Kevlin Henney, // enhanced with contributions from Terje Slettebo, // with additional fixes and suggestions from Gennaro Prota, // Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov, // Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann, // Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters // when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014, Nowember 2016 #ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_STREAMS_HPP #define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_STREAMS_HPP #include <boost/config.hpp> #ifdef BOOST_HAS_PRAGMA_ONCE # pragma once #endif #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING) #define BOOST_LCAST_NO_WCHAR_T #endif #include <cstddef> #include <string> #include <cstring> #include <cstdio> #include <boost/limits.hpp> #include <boost/type_traits/conditional.hpp> #include <boost/type_traits/is_pointer.hpp> #include <boost/static_assert.hpp> #include <boost/detail/workaround.hpp> #ifndef BOOST_NO_STD_LOCALE # include <locale> #else # ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE // Getting error at this point means, that your STL library is old/lame/misconfigured. // If nothing can be done with STL library, define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE, // but beware: lexical_cast will understand only 'C' locale delimeters and thousands // separators. # error "Unable to use <locale> header. Define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE to force " # error "boost::lexical_cast to use only 'C' locale during conversions." # endif #endif #ifdef BOOST_NO_STRINGSTREAM #include <strstream> #else #include <sstream> #endif #include <boost/lexical_cast/detail/lcast_char_constants.hpp> #include <boost/lexical_cast/detail/lcast_unsigned_converters.hpp> #include <boost/lexical_cast/detail/inf_nan.hpp> #include <istream> #ifndef BOOST_NO_CXX11_HDR_ARRAY #include <array> #endif #include <boost/array.hpp> #include <boost/type_traits/make_unsigned.hpp> #include <boost/type_traits/is_integral.hpp> #include <boost/type_traits/is_float.hpp> #include <boost/range/iterator_range_core.hpp> #include <boost/container/container_fwd.hpp> #include <boost/integer.hpp> #include <boost/detail/basic_pointerbuf.hpp> #include <boost/noncopyable.hpp> #ifndef BOOST_NO_CWCHAR # include <cwchar> #endif namespace boost { namespace detail // basic_unlockedbuf { // acts as a stream buffer which wraps around a pair of pointers // and gives acces to internals template <class BufferType, class CharT> class basic_unlockedbuf : public basic_pointerbuf<CharT, BufferType> { public: typedef basic_pointerbuf<CharT, BufferType> base_type; typedef BOOST_DEDUCED_TYPENAME base_type::streamsize streamsize; #ifndef BOOST_NO_USING_TEMPLATE using base_type::pptr; using base_type::pbase; using base_type::setbuf; #else charT* pptr() const { return base_type::pptr(); } charT* pbase() const { return base_type::pbase(); } BufferType* setbuf(char_type* s, streamsize n) { return base_type::setbuf(s, n); } #endif }; } namespace detail { struct do_not_construct_out_buffer_t{}; struct do_not_construct_out_stream_t{ do_not_construct_out_stream_t(do_not_construct_out_buffer_t*){} }; template <class CharT, class Traits> struct out_stream_helper_trait { #if defined(BOOST_NO_STRINGSTREAM) typedef std::ostream out_stream_t; typedef basic_unlockedbuf<std::strstreambuf, char> stringbuffer_t; #elif defined(BOOST_NO_STD_LOCALE) typedef std::ostream out_stream_t; typedef basic_unlockedbuf<std::stringbuf, char> stringbuffer_t; typedef basic_unlockedbuf<std::streambuf, char> buffer_t; #else typedef std::basic_ostream<CharT, Traits> out_stream_t; typedef basic_unlockedbuf<std::basic_stringbuf<CharT, Traits>, CharT> stringbuffer_t; typedef basic_unlockedbuf<std::basic_streambuf<CharT, Traits>, CharT> buffer_t; #endif }; } namespace detail // optimized stream wrappers { template< class CharT // a result of widest_char transformation , class Traits , bool RequiresStringbuffer , std::size_t CharacterBufferSize > class lexical_istream_limited_src: boost::noncopyable { typedef BOOST_DEDUCED_TYPENAME boost::conditional< RequiresStringbuffer, BOOST_DEDUCED_TYPENAME out_stream_helper_trait<CharT, Traits>::out_stream_t, do_not_construct_out_stream_t >::type deduced_out_stream_t; typedef BOOST_DEDUCED_TYPENAME boost::conditional< RequiresStringbuffer, BOOST_DEDUCED_TYPENAME out_stream_helper_trait<CharT, Traits>::stringbuffer_t, do_not_construct_out_buffer_t >::type deduced_out_buffer_t; deduced_out_buffer_t out_buffer; deduced_out_stream_t out_stream; CharT buffer[CharacterBufferSize]; // After the `operator <<` finishes, `[start, finish)` is // the range to output by `operator >>` const CharT* start; const CharT* finish; public: lexical_istream_limited_src() BOOST_NOEXCEPT : out_buffer() , out_stream(&out_buffer) , start(buffer) , finish(buffer + CharacterBufferSize) {} const CharT* cbegin() const BOOST_NOEXCEPT { return start; } const CharT* cend() const BOOST_NOEXCEPT { return finish; } private: /************************************ HELPER FUNCTIONS FOR OPERATORS << ( ... ) ********************************/ bool shl_char(CharT ch) BOOST_NOEXCEPT { Traits::assign(buffer[0], ch); finish = start + 1; return true; } #ifndef BOOST_LCAST_NO_WCHAR_T template <class T> bool shl_char(T ch) { BOOST_STATIC_ASSERT_MSG(( sizeof(T) <= sizeof(CharT)) , "boost::lexical_cast does not support narrowing of char types." "Use boost::locale instead" ); #ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE std::locale loc; CharT const w = BOOST_USE_FACET(std::ctype<CharT>, loc).widen(ch); #else CharT const w = static_cast<CharT>(ch); #endif Traits::assign(buffer[0], w); finish = start + 1; return true; } #endif bool shl_char_array(CharT const* str_value) BOOST_NOEXCEPT { start = str_value; finish = start + Traits::length(str_value); return true; } template <class T> bool shl_char_array(T const* str_value) { BOOST_STATIC_ASSERT_MSG(( sizeof(T) <= sizeof(CharT)), "boost::lexical_cast does not support narrowing of char types." "Use boost::locale instead" ); return shl_input_streamable(str_value); } bool shl_char_array_limited(CharT const* str, std::size_t max_size) BOOST_NOEXCEPT { start = str; finish = std::find(start, start + max_size, Traits::to_char_type(0)); return true; } template<typename InputStreamable> bool shl_input_streamable(InputStreamable& input) { #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE) // If you have compilation error at this point, than your STL library // does not support such conversions. Try updating it. BOOST_STATIC_ASSERT((boost::is_same<char, CharT>::value)); #endif #ifndef BOOST_NO_EXCEPTIONS out_stream.exceptions(std::ios::badbit); try { #endif bool const result = !(out_stream << input).fail(); const deduced_out_buffer_t* const p = static_cast<deduced_out_buffer_t*>( out_stream.rdbuf() ); start = p->pbase(); finish = p->pptr(); return result; #ifndef BOOST_NO_EXCEPTIONS } catch (const ::std::ios_base::failure& /*f*/) { return false; } #endif } template <class T> inline bool shl_unsigned(const T n) { CharT* tmp_finish = buffer + CharacterBufferSize; start = lcast_put_unsigned<Traits, T, CharT>(n, tmp_finish).convert(); finish = tmp_finish; return true; } template <class T> inline bool shl_signed(const T n) { CharT* tmp_finish = buffer + CharacterBufferSize; typedef BOOST_DEDUCED_TYPENAME boost::make_unsigned<T>::type utype; CharT* tmp_start = lcast_put_unsigned<Traits, utype, CharT>(lcast_to_unsigned(n), tmp_finish).convert(); if (n < 0) { --tmp_start; CharT const minus = lcast_char_constants<CharT>::minus; Traits::assign(*tmp_start, minus); } start = tmp_start; finish = tmp_finish; return true; } template <class T, class SomeCharT> bool shl_real_type(const T& val, SomeCharT* /*begin*/) { lcast_set_precision(out_stream, &val); return shl_input_streamable(val); } bool shl_real_type(float val, char* begin) { using namespace std; const double val_as_double = val; finish = start + #if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) sprintf_s(begin, CharacterBufferSize, #else sprintf(begin, #endif "%.*g", static_cast<int>(boost::detail::lcast_get_precision<float>()), val_as_double); return finish > start; } bool shl_real_type(double val, char* begin) { using namespace std; finish = start + #if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) sprintf_s(begin, CharacterBufferSize, #else sprintf(begin, #endif "%.*g", static_cast<int>(boost::detail::lcast_get_precision<double>()), val); return finish > start; } #ifndef __MINGW32__ bool shl_real_type(long double val, char* begin) { using namespace std; finish = start + #if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) sprintf_s(begin, CharacterBufferSize, #else sprintf(begin, #endif "%.*Lg", static_cast<int>(boost::detail::lcast_get_precision<long double>()), val ); return finish > start; } #endif #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_SWPRINTF) && !defined(__MINGW32__) bool shl_real_type(float val, wchar_t* begin) { using namespace std; const double val_as_double = val; finish = start + swprintf(begin, CharacterBufferSize, L"%.*g", static_cast<int>(boost::detail::lcast_get_precision<float >()), val_as_double ); return finish > start; } bool shl_real_type(double val, wchar_t* begin) { using namespace std; finish = start + swprintf(begin, CharacterBufferSize, L"%.*g", static_cast<int>(boost::detail::lcast_get_precision<double >()), val ); return finish > start; } bool shl_real_type(long double val, wchar_t* begin) { using namespace std; finish = start + swprintf(begin, CharacterBufferSize, L"%.*Lg", static_cast<int>(boost::detail::lcast_get_precision<long double >()), val ); return finish > start; } #endif template <class T> bool shl_real(T val) { CharT* tmp_finish = buffer + CharacterBufferSize; if (put_inf_nan(buffer, tmp_finish, val)) { finish = tmp_finish; return true; } return shl_real_type(val, static_cast<CharT*>(buffer)); } /************************************ OPERATORS << ( ... ) ********************************/ public: template<class Alloc> bool operator<<(std::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT { start = str.data(); finish = start + str.length(); return true; } template<class Alloc> bool operator<<(boost::container::basic_string<CharT,Traits,Alloc> const& str) BOOST_NOEXCEPT { start = str.data(); finish = start + str.length(); return true; } bool operator<<(bool value) BOOST_NOEXCEPT { CharT const czero = lcast_char_constants<CharT>::zero; Traits::assign(buffer[0], Traits::to_char_type(czero + value)); finish = start + 1; return true; } template <class C> BOOST_DEDUCED_TYPENAME boost::disable_if<boost::is_const<C>, bool>::type operator<<(const iterator_range<C*>& rng) BOOST_NOEXCEPT { return (*this) << iterator_range<const C*>(rng.begin(), rng.end()); } bool operator<<(const iterator_range<const CharT*>& rng) BOOST_NOEXCEPT { start = rng.begin(); finish = rng.end(); return true; } bool operator<<(const iterator_range<const signed char*>& rng) BOOST_NOEXCEPT { return (*this) << iterator_range<const char*>( reinterpret_cast<const char*>(rng.begin()), reinterpret_cast<const char*>(rng.end()) ); } bool operator<<(const iterator_range<const unsigned char*>& rng) BOOST_NOEXCEPT { return (*this) << iterator_range<const char*>( reinterpret_cast<const char*>(rng.begin()), reinterpret_cast<const char*>(rng.end()) ); } bool operator<<(char ch) { return shl_char(ch); } bool operator<<(unsigned char ch) { return ((*this) << static_cast<char>(ch)); } bool operator<<(signed char ch) { return ((*this) << static_cast<char>(ch)); } #if !defined(BOOST_LCAST_NO_WCHAR_T) bool operator<<(wchar_t const* str) { return shl_char_array(str); } bool operator<<(wchar_t * str) { return shl_char_array(str); } #ifndef BOOST_NO_INTRINSIC_WCHAR_T bool operator<<(wchar_t ch) { return shl_char(ch); } #endif #endif #if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) bool operator<<(char16_t ch) { return shl_char(ch); } bool operator<<(char16_t * str) { return shl_char_array(str); } bool operator<<(char16_t const * str) { return shl_char_array(str); } #endif #if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) bool operator<<(char32_t ch) { return shl_char(ch); } bool operator<<(char32_t * str) { return shl_char_array(str); } bool operator<<(char32_t const * str) { return shl_char_array(str); } #endif bool operator<<(unsigned char const* ch) { return ((*this) << reinterpret_cast<char const*>(ch)); } bool operator<<(unsigned char * ch) { return ((*this) << reinterpret_cast<char *>(ch)); } bool operator<<(signed char const* ch) { return ((*this) << reinterpret_cast<char const*>(ch)); } bool operator<<(signed char * ch) { return ((*this) << reinterpret_cast<char *>(ch)); } bool operator<<(char const* str_value) { return shl_char_array(str_value); } bool operator<<(char* str_value) { return shl_char_array(str_value); } bool operator<<(short n) { return shl_signed(n); } bool operator<<(int n) { return shl_signed(n); } bool operator<<(long n) { return shl_signed(n); } bool operator<<(unsigned short n) { return shl_unsigned(n); } bool operator<<(unsigned int n) { return shl_unsigned(n); } bool operator<<(unsigned long n) { return shl_unsigned(n); } #if defined(BOOST_HAS_LONG_LONG) bool operator<<(boost::ulong_long_type n) { return shl_unsigned(n); } bool operator<<(boost::long_long_type n) { return shl_signed(n); } #elif defined(BOOST_HAS_MS_INT64) bool operator<<(unsigned __int64 n) { return shl_unsigned(n); } bool operator<<( __int64 n) { return shl_signed(n); } #endif #ifdef BOOST_HAS_INT128 bool operator<<(const boost::uint128_type& n) { return shl_unsigned(n); } bool operator<<(const boost::int128_type& n) { return shl_signed(n); } #endif bool operator<<(float val) { return shl_real(val); } bool operator<<(double val) { return shl_real(val); } bool operator<<(long double val) { #ifndef __MINGW32__ return shl_real(val); #else return shl_real(static_cast<double>(val)); #endif } // Adding constness to characters. Constness does not change layout template <class C, std::size_t N> BOOST_DEDUCED_TYPENAME boost::disable_if<boost::is_const<C>, bool>::type operator<<(boost::array<C, N> const& input) BOOST_NOEXCEPT { BOOST_STATIC_ASSERT_MSG( (sizeof(boost::array<const C, N>) == sizeof(boost::array<C, N>)), "boost::array<C, N> and boost::array<const C, N> must have exactly the same layout." ); return ((*this) << reinterpret_cast<boost::array<const C, N> const& >(input)); } template <std::size_t N> bool operator<<(boost::array<const CharT, N> const& input) BOOST_NOEXCEPT { return shl_char_array_limited(input.data(), N); } template <std::size_t N> bool operator<<(boost::array<const unsigned char, N> const& input) BOOST_NOEXCEPT { return ((*this) << reinterpret_cast<boost::array<const char, N> const& >(input)); } template <std::size_t N> bool operator<<(boost::array<const signed char, N> const& input) BOOST_NOEXCEPT { return ((*this) << reinterpret_cast<boost::array<const char, N> const& >(input)); } #ifndef BOOST_NO_CXX11_HDR_ARRAY // Making a Boost.Array from std::array template <class C, std::size_t N> bool operator<<(std::array<C, N> const& input) BOOST_NOEXCEPT { BOOST_STATIC_ASSERT_MSG( (sizeof(std::array<C, N>) == sizeof(boost::array<C, N>)), "std::array and boost::array must have exactly the same layout. " "Bug in implementation of std::array or boost::array." ); return ((*this) << reinterpret_cast<boost::array<C, N> const& >(input)); } #endif template <class InStreamable> bool operator<<(const InStreamable& input) { return shl_input_streamable(input); } }; template <class CharT, class Traits> class lexical_ostream_limited_src: boost::noncopyable { //`[start, finish)` is the range to output by `operator >>` const CharT* start; const CharT* const finish; public: lexical_ostream_limited_src(const CharT* begin, const CharT* end) BOOST_NOEXCEPT : start(begin) , finish(end) {} /************************************ HELPER FUNCTIONS FOR OPERATORS >> ( ... ) ********************************/ private: template <typename Type> bool shr_unsigned(Type& output) { if (start == finish) return false; CharT const minus = lcast_char_constants<CharT>::minus; CharT const plus = lcast_char_constants<CharT>::plus; bool const has_minus = Traits::eq(minus, *start); /* We won`t use `start' any more, so no need in decrementing it after */ if (has_minus || Traits::eq(plus, *start)) { ++start; } bool const succeed = lcast_ret_unsigned<Traits, Type, CharT>(output, start, finish).convert(); if (has_minus) { output = static_cast<Type>(0u - output); } return succeed; } template <typename Type> bool shr_signed(Type& output) { if (start == finish) return false; CharT const minus = lcast_char_constants<CharT>::minus; CharT const plus = lcast_char_constants<CharT>::plus; typedef BOOST_DEDUCED_TYPENAME make_unsigned<Type>::type utype; utype out_tmp = 0; bool const has_minus = Traits::eq(minus, *start); /* We won`t use `start' any more, so no need in decrementing it after */ if (has_minus || Traits::eq(plus, *start)) { ++start; } bool succeed = lcast_ret_unsigned<Traits, utype, CharT>(out_tmp, start, finish).convert(); if (has_minus) { utype const comp_val = (static_cast<utype>(1) << std::numeric_limits<Type>::digits); succeed = succeed && out_tmp<=comp_val; output = static_cast<Type>(0u - out_tmp); } else { utype const comp_val = static_cast<utype>((std::numeric_limits<Type>::max)()); succeed = succeed && out_tmp<=comp_val; output = static_cast<Type>(out_tmp); } return succeed; } template<typename InputStreamable> bool shr_using_base_class(InputStreamable& output) { BOOST_STATIC_ASSERT_MSG( (!boost::is_pointer<InputStreamable>::value), "boost::lexical_cast can not convert to pointers" ); #if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE) BOOST_STATIC_ASSERT_MSG((boost::is_same<char, CharT>::value), "boost::lexical_cast can not convert, because your STL library does not " "support such conversions. Try updating it." ); #endif #if defined(BOOST_NO_STRINGSTREAM) std::istrstream stream(start, static_cast<std::istrstream::streamsize>(finish - start)); #else typedef BOOST_DEDUCED_TYPENAME out_stream_helper_trait<CharT, Traits>::buffer_t buffer_t; buffer_t buf; // Usually `istream` and `basic_istream` do not modify // content of buffer; `buffer_t` assures that this is true buf.setbuf(const_cast<CharT*>(start), static_cast<typename buffer_t::streamsize>(finish - start)); #if defined(BOOST_NO_STD_LOCALE) std::istream stream(&buf); #else std::basic_istream<CharT, Traits> stream(&buf); #endif // BOOST_NO_STD_LOCALE #endif // BOOST_NO_STRINGSTREAM #ifndef BOOST_NO_EXCEPTIONS stream.exceptions(std::ios::badbit); try { #endif stream.unsetf(std::ios::skipws); lcast_set_precision(stream, static_cast<InputStreamable*>(0)); return (stream >> output) && (stream.get() == Traits::eof()); #ifndef BOOST_NO_EXCEPTIONS } catch (const ::std::ios_base::failure& /*f*/) { return false; } #endif } template<class T> inline bool shr_xchar(T& output) BOOST_NOEXCEPT { BOOST_STATIC_ASSERT_MSG(( sizeof(CharT) == sizeof(T) ), "boost::lexical_cast does not support narrowing of character types." "Use boost::locale instead" ); bool const ok = (finish - start == 1); if (ok) { CharT out; Traits::assign(out, *start); output = static_cast<T>(out); } return ok; } template <std::size_t N, class ArrayT> bool shr_std_array(ArrayT& output) BOOST_NOEXCEPT { using namespace std; const std::size_t size = static_cast<std::size_t>(finish - start); if (size > N - 1) { // `-1` because we need to store \0 at the end return false; } memcpy(&output[0], start, size * sizeof(CharT)); output[size] = Traits::to_char_type(0); return true; } /************************************ OPERATORS >> ( ... ) ********************************/ public: bool operator>>(unsigned short& output) { return shr_unsigned(output); } bool operator>>(unsigned int& output) { return shr_unsigned(output); } bool operator>>(unsigned long int& output) { return shr_unsigned(output); } bool operator>>(short& output) { return shr_signed(output); } bool operator>>(int& output) { return shr_signed(output); } bool operator>>(long int& output) { return shr_signed(output); } #if defined(BOOST_HAS_LONG_LONG) bool operator>>(boost::ulong_long_type& output) { return shr_unsigned(output); } bool operator>>(boost::long_long_type& output) { return shr_signed(output); } #elif defined(BOOST_HAS_MS_INT64) bool operator>>(unsigned __int64& output) { return shr_unsigned(output); } bool operator>>(__int64& output) { return shr_signed(output); } #endif #ifdef BOOST_HAS_INT128 bool operator>>(boost::uint128_type& output) { return shr_unsigned(output); } bool operator>>(boost::int128_type& output) { return shr_signed(output); } #endif bool operator>>(char& output) { return shr_xchar(output); } bool operator>>(unsigned char& output) { return shr_xchar(output); } bool operator>>(signed char& output) { return shr_xchar(output); } #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) bool operator>>(wchar_t& output) { return shr_xchar(output); } #endif #if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) bool operator>>(char16_t& output) { return shr_xchar(output); } #endif #if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) bool operator>>(char32_t& output) { return shr_xchar(output); } #endif template<class Alloc> bool operator>>(std::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; } template<class Alloc> bool operator>>(boost::container::basic_string<CharT,Traits,Alloc>& str) { str.assign(start, finish); return true; } template <std::size_t N> bool operator>>(boost::array<CharT, N>& output) BOOST_NOEXCEPT { return shr_std_array<N>(output); } template <std::size_t N> bool operator>>(boost::array<unsigned char, N>& output) BOOST_NOEXCEPT { return ((*this) >> reinterpret_cast<boost::array<char, N>& >(output)); } template <std::size_t N> bool operator>>(boost::array<signed char, N>& output) BOOST_NOEXCEPT { return ((*this) >> reinterpret_cast<boost::array<char, N>& >(output)); } #ifndef BOOST_NO_CXX11_HDR_ARRAY template <class C, std::size_t N> bool operator>>(std::array<C, N>& output) BOOST_NOEXCEPT { BOOST_STATIC_ASSERT_MSG( (sizeof(std::array<C, N>) == sizeof(boost::array<C, N>)), "std::array<C, N> and boost::array<C, N> must have exactly the same layout." ); return ((*this) >> reinterpret_cast<boost::array<C, N>& >(output)); } #endif bool operator>>(bool& output) BOOST_NOEXCEPT { output = false; // Suppress warning about uninitalized variable if (start == finish) return false; CharT const zero = lcast_char_constants<CharT>::zero; CharT const plus = lcast_char_constants<CharT>::plus; CharT const minus = lcast_char_constants<CharT>::minus; const CharT* const dec_finish = finish - 1; output = Traits::eq(*dec_finish, zero + 1); if (!output && !Traits::eq(*dec_finish, zero)) { return false; // Does not ends on '0' or '1' } if (start == dec_finish) return true; // We may have sign at the beginning if (Traits::eq(plus, *start) || (Traits::eq(minus, *start) && !output)) { ++ start; } // Skipping zeros while (start != dec_finish) { if (!Traits::eq(zero, *start)) { return false; // Not a zero => error } ++ start; } return true; } private: // Not optimised converter template <class T> bool float_types_converter_internal(T& output) { if (parse_inf_nan(start, finish, output)) return true; bool const return_value = shr_using_base_class(output); /* Some compilers and libraries successfully * parse 'inf', 'INFINITY', '1.0E', '1.0E-'... * We are trying to provide a unified behaviour, * so we just forbid such conversions (as some * of the most popular compilers/libraries do) * */ CharT const minus = lcast_char_constants<CharT>::minus; CharT const plus = lcast_char_constants<CharT>::plus; CharT const capital_e = lcast_char_constants<CharT>::capital_e; CharT const lowercase_e = lcast_char_constants<CharT>::lowercase_e; if ( return_value && ( Traits::eq(*(finish-1), lowercase_e) // 1.0e || Traits::eq(*(finish-1), capital_e) // 1.0E || Traits::eq(*(finish-1), minus) // 1.0e- or 1.0E- || Traits::eq(*(finish-1), plus) // 1.0e+ or 1.0E+ ) ) return false; return return_value; } public: bool operator>>(float& output) { return float_types_converter_internal(output); } bool operator>>(double& output) { return float_types_converter_internal(output); } bool operator>>(long double& output) { return float_types_converter_internal(output); } // Generic istream-based algorithm. // lcast_streambuf_for_target<InputStreamable>::value is true. template <typename InputStreamable> bool operator>>(InputStreamable& output) { return shr_using_base_class(output); } }; } } // namespace boost #undef BOOST_LCAST_NO_WCHAR_T #endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP