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363 lines
12 KiB
363 lines
12 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
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// (C) Copyright 2003-2007 Jonathan Turkanis |
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// Distributed under the Boost Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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// See http://www.boost.org/libs/iostreams for documentation. |
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// |
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// Contains metafunctions char_type_of, category_of and mode_of used for |
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// deducing the i/o category and i/o mode of a model of Filter or Device. |
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// |
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// Also contains several utility metafunctions, functions and macros. |
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// |
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#ifndef BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED |
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#define BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED |
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#if defined(_MSC_VER) |
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# pragma once |
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#endif |
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#include <iosfwd> // stream types, char_traits. |
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#include <boost/config.hpp> // partial spec, deduced typename. |
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#include <boost/detail/workaround.hpp> |
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#include <boost/iostreams/categories.hpp> |
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#include <boost/iostreams/detail/bool_trait_def.hpp> |
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#include <boost/iostreams/detail/config/wide_streams.hpp> |
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#include <boost/iostreams/detail/is_iterator_range.hpp> |
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#include <boost/iostreams/detail/select.hpp> |
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#include <boost/iostreams/detail/select_by_size.hpp> |
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#include <boost/iostreams/detail/wrap_unwrap.hpp> |
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#include <boost/iostreams/traits_fwd.hpp> |
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#include <boost/mpl/bool.hpp> |
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#include <boost/mpl/eval_if.hpp> |
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#include <boost/mpl/identity.hpp> |
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#include <boost/mpl/int.hpp> |
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#include <boost/mpl/or.hpp> |
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#include <boost/range/iterator_range.hpp> |
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#include <boost/range/value_type.hpp> |
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#include <boost/ref.hpp> |
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#include <boost/type_traits/is_convertible.hpp> |
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// Must come last. |
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#include <boost/iostreams/detail/config/disable_warnings.hpp> |
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namespace boost { namespace iostreams { |
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//----------Definitions of predicates for streams and stream buffers----------// |
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#ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------------------// |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istream, std::basic_istream, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostream, std::basic_ostream, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_iostream, std::basic_iostream, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_streambuf, std::basic_streambuf, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ifstream, std::basic_ifstream, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ofstream, std::basic_ofstream, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_fstream, std::basic_fstream, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_filebuf, std::basic_filebuf, 2) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istringstream, std::basic_istringstream, 3) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostringstream, std::basic_ostringstream, 3) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_stringstream, std::basic_stringstream, 3) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_stringbuf, std::basic_stringbuf, 3) |
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#else // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-----------------------// |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istream, std::istream, 0) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostream, std::ostream, 0) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_iostream, std::iostream, 0) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_streambuf, std::streambuf, 0) |
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#endif // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //----------------------// |
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template<typename T> |
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struct is_std_io |
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: mpl::or_< is_istream<T>, is_ostream<T>, is_streambuf<T> > |
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{ }; |
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template<typename T> |
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struct is_std_file_device |
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: mpl::or_< |
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is_ifstream<T>, |
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is_ofstream<T>, |
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is_fstream<T>, |
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is_filebuf<T> |
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> |
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{ }; |
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template<typename T> |
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struct is_std_string_device |
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: mpl::or_< |
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is_istringstream<T>, |
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is_ostringstream<T>, |
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is_stringstream<T>, |
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is_stringbuf<T> |
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> |
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{ }; |
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template<typename Device, typename Tr, typename Alloc> |
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struct stream; |
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template<typename T, typename Tr, typename Alloc, typename Mode> |
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class stream_buffer; |
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template< typename Mode, typename Ch, typename Tr, |
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typename Alloc, typename Access > |
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class filtering_stream; |
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template< typename Mode, typename Ch, typename Tr, |
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typename Alloc, typename Access > |
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class wfiltering_stream; |
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template< typename Mode, typename Ch, typename Tr, |
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typename Alloc, typename Access > |
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class filtering_streambuf; |
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template< typename Mode, typename Ch, typename Tr, |
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typename Alloc, typename Access > |
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class filtering_wstreambuf; |
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namespace detail { |
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template<typename T, typename Tr> |
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class linked_streambuf; |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_boost_stream, |
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boost::iostreams::stream, |
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3 ) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_boost_stream_buffer, |
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boost::iostreams::stream_buffer, |
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4 ) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_stream_impl, |
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boost::iostreams::filtering_stream, |
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5 ) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_wstream_impl, |
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boost::iostreams::wfiltering_stream, |
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5 ) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_streambuf_impl, |
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boost::iostreams::filtering_streambuf, |
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5 ) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_wstreambuf_impl, |
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boost::iostreams::filtering_wstreambuf, |
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5 ) |
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BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_linked, linked_streambuf, 2) |
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template<typename T> |
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struct is_filtering_stream |
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: mpl::or_< |
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is_filtering_stream_impl<T>, |
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is_filtering_wstream_impl<T> |
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> |
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{ }; |
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template<typename T> |
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struct is_filtering_streambuf |
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: mpl::or_< |
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is_filtering_streambuf_impl<T>, |
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is_filtering_wstreambuf_impl<T> |
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> |
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{ }; |
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template<typename T> |
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struct is_boost |
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: mpl::or_< |
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is_boost_stream<T>, |
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is_boost_stream_buffer<T>, |
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is_filtering_stream<T>, |
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is_filtering_streambuf<T> |
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> |
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{ }; |
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} // End namespace detail. |
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//------------------Definitions of char_type_of-------------------------------// |
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namespace detail { |
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template<typename T> |
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struct member_char_type { typedef typename T::char_type type; }; |
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} // End namespace detail. |
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# ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------// |
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template<typename T> |
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struct char_type_of |
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: detail::member_char_type< |
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typename detail::unwrapped_type<T>::type |
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> |
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{ }; |
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# else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------// |
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template<typename T> |
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struct char_type_of { |
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typedef typename detail::unwrapped_type<T>::type U; |
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typedef typename |
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mpl::eval_if< |
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is_std_io<U>, |
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mpl::identity<char>, |
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detail::member_char_type<U> |
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>::type type; |
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}; |
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# endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------// |
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template<typename Iter> |
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struct char_type_of< iterator_range<Iter> > { |
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typedef typename iterator_value<Iter>::type type; |
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}; |
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//------------------Definitions of category_of--------------------------------// |
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namespace detail { |
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template<typename T> |
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struct member_category { typedef typename T::category type; }; |
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} // End namespace detail. |
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template<typename T> |
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struct category_of { |
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template<typename U> |
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struct member_category { |
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typedef typename U::category type; |
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}; |
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typedef typename detail::unwrapped_type<T>::type U; |
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typedef typename |
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mpl::eval_if< |
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mpl::and_< |
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is_std_io<U>, |
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mpl::not_< detail::is_boost<U> > |
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>, |
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iostreams::select< // Disambiguation for Tru64 |
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is_filebuf<U>, filebuf_tag, |
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is_ifstream<U>, ifstream_tag, |
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is_ofstream<U>, ofstream_tag, |
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is_fstream<U>, fstream_tag, |
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is_stringbuf<U>, stringbuf_tag, |
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is_istringstream<U>, istringstream_tag, |
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is_ostringstream<U>, ostringstream_tag, |
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is_stringstream<U>, stringstream_tag, |
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is_streambuf<U>, generic_streambuf_tag, |
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is_iostream<U>, generic_iostream_tag, |
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is_istream<U>, generic_istream_tag, |
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is_ostream<U>, generic_ostream_tag |
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>, |
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detail::member_category<U> |
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>::type type; |
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}; |
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// Partial specialization for reference wrappers |
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template<typename T> |
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struct category_of< reference_wrapper<T> > |
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: category_of<T> |
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{ }; |
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//------------------Definition of get_category--------------------------------// |
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// |
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// Returns an object of type category_of<T>::type. |
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// |
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template<typename T> |
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inline typename category_of<T>::type get_category(const T&) |
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{ typedef typename category_of<T>::type category; return category(); } |
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//------------------Definition of int_type_of---------------------------------// |
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template<typename T> |
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struct int_type_of { |
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#ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES |
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typedef std::char_traits< |
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BOOST_DEDUCED_TYPENAME char_type_of<T>::type |
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> traits_type; |
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typedef typename traits_type::int_type type; |
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#else |
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typedef int type; |
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#endif |
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}; |
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//------------------Definition of mode_of-------------------------------------// |
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namespace detail { |
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template<int N> struct io_mode_impl; |
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#define BOOST_IOSTREAMS_MODE_HELPER(tag_, id_) \ |
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case_<id_> io_mode_impl_helper(tag_); \ |
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template<> struct io_mode_impl<id_> { typedef tag_ type; }; \ |
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/**/ |
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BOOST_IOSTREAMS_MODE_HELPER(input, 1) |
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BOOST_IOSTREAMS_MODE_HELPER(output, 2) |
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BOOST_IOSTREAMS_MODE_HELPER(bidirectional, 3) |
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BOOST_IOSTREAMS_MODE_HELPER(input_seekable, 4) |
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BOOST_IOSTREAMS_MODE_HELPER(output_seekable, 5) |
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BOOST_IOSTREAMS_MODE_HELPER(seekable, 6) |
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BOOST_IOSTREAMS_MODE_HELPER(dual_seekable, 7) |
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BOOST_IOSTREAMS_MODE_HELPER(bidirectional_seekable, 8) |
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BOOST_IOSTREAMS_MODE_HELPER(dual_use, 9) |
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#undef BOOST_IOSTREAMS_MODE_HELPER |
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template<typename T> |
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struct io_mode_id { |
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typedef typename category_of<T>::type category; |
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BOOST_SELECT_BY_SIZE(int, value, detail::io_mode_impl_helper(category())); |
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}; |
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} // End namespace detail. |
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template<typename T> // Borland 5.6.4 requires this circumlocution. |
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struct mode_of : detail::io_mode_impl< detail::io_mode_id<T>::value > { }; |
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// Partial specialization for reference wrappers |
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template<typename T> |
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struct mode_of< reference_wrapper<T> > |
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: mode_of<T> |
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{ }; |
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//------------------Definition of is_device, is_filter and is_direct----------// |
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namespace detail { |
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template<typename T, typename Tag> |
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struct has_trait_impl { |
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typedef typename category_of<T>::type category; |
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BOOST_STATIC_CONSTANT(bool, value = (is_convertible<category, Tag>::value)); |
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}; |
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template<typename T, typename Tag> |
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struct has_trait |
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: mpl::bool_<has_trait_impl<T, Tag>::value> |
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{ }; |
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} // End namespace detail. |
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template<typename T> |
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struct is_device : detail::has_trait<T, device_tag> { }; |
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template<typename T> |
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struct is_filter : detail::has_trait<T, filter_tag> { }; |
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template<typename T> |
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struct is_direct : detail::has_trait<T, direct_tag> { }; |
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//------------------Definition of BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS----------// |
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#define BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \ |
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typedef Tr traits_type; \ |
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typedef typename traits_type::int_type int_type; \ |
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typedef typename traits_type::off_type off_type; \ |
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typedef typename traits_type::pos_type pos_type; \ |
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/**/ |
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} } // End namespaces iostreams, boost. |
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#include <boost/iostreams/detail/config/enable_warnings.hpp> |
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#endif // #ifndef BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED
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