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392 lines
13 KiB
C++
392 lines
13 KiB
C++
// (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) && (_MSC_VER >= 1020)
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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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#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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# include <boost/range/iterator_range.hpp>
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# include <boost/range/value_type.hpp>
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#endif // #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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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_NO_TEMPLATE_PARTIAL_SPECIALIZATION //---------------------------//
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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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#else // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //------------------//
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template<typename T>
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struct char_type_of {
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template<typename U>
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struct get_value_type {
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#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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typedef typename range_value<U>::type type;
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#endif // #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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};
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typedef typename
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mpl::eval_if<
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is_iterator_range<T>,
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get_value_type<T>,
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detail::member_char_type<
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BOOST_DEDUCED_TYPENAME detail::unwrapped_type<T>::type
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>
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>::type type;
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};
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#endif // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //-----------------//
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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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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //---------------------------//
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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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#endif // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //-----------------//
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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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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //---------------------------//
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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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#endif // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //-----------------//
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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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