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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\iostreams\traits.hpp
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) // (C) Copyright 2003-2007 Jonathan Turkanis // 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/iostreams for documentation. // // Contains metafunctions char_type_of, category_of and mode_of used for // deducing the i/o category and i/o mode of a model of Filter or Device. // // Also contains several utility metafunctions, functions and macros. // #ifndef BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED #define BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif #include
// stream types, char_traits. #include
// partial spec, deduced typename. #include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) # include
# include
#endif // #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) #include
namespace boost { namespace iostreams { //----------Definitions of predicates for streams and stream buffers----------// #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------------------// BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istream, std::basic_istream, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostream, std::basic_ostream, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_iostream, std::basic_iostream, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_streambuf, std::basic_streambuf, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ifstream, std::basic_ifstream, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ofstream, std::basic_ofstream, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_fstream, std::basic_fstream, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_filebuf, std::basic_filebuf, 2) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istringstream, std::basic_istringstream, 3) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostringstream, std::basic_ostringstream, 3) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_stringstream, std::basic_stringstream, 3) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_stringbuf, std::basic_stringbuf, 3) #else // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-----------------------// BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istream, std::istream, 0) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostream, std::ostream, 0) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_iostream, std::iostream, 0) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_streambuf, std::streambuf, 0) #endif // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //----------------------// template
struct is_std_io : mpl::or_< is_istream
, is_ostream
, is_streambuf
> { }; template
struct is_std_file_device : mpl::or_< is_ifstream
, is_ofstream
, is_fstream
, is_filebuf
> { }; template
struct is_std_string_device : mpl::or_< is_istringstream
, is_ostringstream
, is_stringstream
, is_stringbuf
> { }; template
struct stream; template
class stream_buffer; template< typename Mode, typename Ch, typename Tr, typename Alloc, typename Access > class filtering_stream; template< typename Mode, typename Ch, typename Tr, typename Alloc, typename Access > class wfiltering_stream; template< typename Mode, typename Ch, typename Tr, typename Alloc, typename Access > class filtering_streambuf; template< typename Mode, typename Ch, typename Tr, typename Alloc, typename Access > class filtering_wstreambuf; namespace detail { template
class linked_streambuf; BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_boost_stream, boost::iostreams::stream, 3 ) BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_boost_stream_buffer, boost::iostreams::stream_buffer, 4 ) BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_stream_impl, boost::iostreams::filtering_stream, 5 ) BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_wstream_impl, boost::iostreams::wfiltering_stream, 5 ) BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_streambuf_impl, boost::iostreams::filtering_streambuf, 5 ) BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_wstreambuf_impl, boost::iostreams::filtering_wstreambuf, 5 ) BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_linked, linked_streambuf, 2) template
struct is_filtering_stream : mpl::or_< is_filtering_stream_impl
, is_filtering_wstream_impl
> { }; template
struct is_filtering_streambuf : mpl::or_< is_filtering_streambuf_impl
, is_filtering_wstreambuf_impl
> { }; template
struct is_boost : mpl::or_< is_boost_stream
, is_boost_stream_buffer
, is_filtering_stream
, is_filtering_streambuf
> { }; } // End namespace detail. //------------------Definitions of char_type_of-------------------------------// namespace detail { template
struct member_char_type { typedef typename T::char_type type; }; } // End namespace detail. #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //---------------------------// # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------// template
struct char_type_of : detail::member_char_type< typename detail::unwrapped_type
::type > { }; # else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------// template
struct char_type_of { typedef typename detail::unwrapped_type
::type U; typedef typename mpl::eval_if< is_std_io
, mpl::identity
, detail::member_char_type
>::type type; }; # endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------// template
struct char_type_of< iterator_range
> { typedef typename iterator_value
::type type; }; #else // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //------------------// template
struct char_type_of { template
struct get_value_type { #if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) typedef typename range_value
::type type; #endif // #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) }; typedef typename mpl::eval_if< is_iterator_range
, get_value_type
, detail::member_char_type< BOOST_DEDUCED_TYPENAME detail::unwrapped_type
::type > >::type type; }; #endif // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //-----------------// //------------------Definitions of category_of--------------------------------// namespace detail { template
struct member_category { typedef typename T::category type; }; } // End namespace detail. template
struct category_of { template
struct member_category { typedef typename U::category type; }; typedef typename detail::unwrapped_type
::type U; typedef typename mpl::eval_if< mpl::and_< is_std_io
, mpl::not_< detail::is_boost
> >, iostreams::select< // Disambiguation for Tru64 is_filebuf
, filebuf_tag, is_ifstream
, ifstream_tag, is_ofstream
, ofstream_tag, is_fstream
, fstream_tag, is_stringbuf
, stringbuf_tag, is_istringstream
, istringstream_tag, is_ostringstream
, ostringstream_tag, is_stringstream
, stringstream_tag, is_streambuf
, generic_streambuf_tag, is_iostream
, generic_iostream_tag, is_istream
, generic_istream_tag, is_ostream
, generic_ostream_tag >, detail::member_category
>::type type; }; //------------------Definition of get_category--------------------------------// // // Returns an object of type category_of
::type. // template
inline typename category_of
::type get_category(const T&) { typedef typename category_of
::type category; return category(); } //------------------Definition of int_type_of---------------------------------// template
struct int_type_of { #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES typedef std::char_traits< BOOST_DEDUCED_TYPENAME char_type_of
::type > traits_type; typedef typename traits_type::int_type type; #else typedef int type; #endif }; //------------------Definition of mode----------------------------------------// namespace detail { template
struct io_mode_impl; #define BOOST_IOSTREAMS_MODE_HELPER(tag_, id_) \ case_
io_mode_impl_helper(tag_); \ template<> struct io_mode_impl
{ typedef tag_ type; }; \ /**/ BOOST_IOSTREAMS_MODE_HELPER(input, 1) BOOST_IOSTREAMS_MODE_HELPER(output, 2) BOOST_IOSTREAMS_MODE_HELPER(bidirectional, 3) BOOST_IOSTREAMS_MODE_HELPER(input_seekable, 4) BOOST_IOSTREAMS_MODE_HELPER(output_seekable, 5) BOOST_IOSTREAMS_MODE_HELPER(seekable, 6) BOOST_IOSTREAMS_MODE_HELPER(dual_seekable, 7) BOOST_IOSTREAMS_MODE_HELPER(bidirectional_seekable, 8) BOOST_IOSTREAMS_MODE_HELPER(dual_use, 9) #undef BOOST_IOSTREAMS_MODE_HELPER template
struct io_mode_id { typedef typename category_of
::type category; BOOST_SELECT_BY_SIZE(int, value, detail::io_mode_impl_helper(category())); }; } // End namespace detail. template
// Borland 5.6.4 requires this circumlocution. struct mode_of : detail::io_mode_impl< detail::io_mode_id
::value > { }; //------------------Definition of is_device, is_filter and is_direct----------// namespace detail { template
struct has_trait_impl { typedef typename category_of
::type category; BOOST_STATIC_CONSTANT(bool, value = (is_convertible
::value)); }; template
struct has_trait : mpl::bool_
::value> { }; } // End namespace detail. template
struct is_device : detail::has_trait
{ }; template
struct is_filter : detail::has_trait
{ }; template
struct is_direct : detail::has_trait
{ }; //------------------Definition of BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS----------// #define BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \ typedef Tr traits_type; \ typedef typename traits_type::int_type int_type; \ typedef typename traits_type::off_type off_type; \ typedef typename traits_type::pos_type pos_type; \ /**/ } } // End namespaces iostreams, boost. #endif // #ifndef BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED
traits.hpp
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