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231 lines
8.3 KiB
231 lines
8.3 KiB
3 years ago
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// (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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#ifndef BOOST_IOSTREAMS_DETAIL_RESOLVE_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_RESOLVE_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 <boost/config.hpp> // partial spec, put size_t in std.
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#include <cstddef> // std::size_t.
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#include <boost/detail/is_incrementable.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/iostreams/detail/adapter/mode_adapter.hpp>
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#include <boost/iostreams/detail/adapter/output_iterator_adapter.hpp>
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#include <boost/iostreams/detail/adapter/range_adapter.hpp>
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#include <boost/iostreams/detail/config/gcc.hpp>
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#include <boost/iostreams/detail/config/overload_resolution.hpp>
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#include <boost/iostreams/detail/config/wide_streams.hpp>
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#include <boost/iostreams/detail/enable_if_stream.hpp>
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#include <boost/iostreams/detail/is_dereferenceable.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/wrap_unwrap.hpp>
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#include <boost/iostreams/device/array.hpp>
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#include <boost/iostreams/traits.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/bool.hpp> // true_.
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#include <boost/mpl/if.hpp>
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#include <boost/range/iterator_range.hpp>
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#include <boost/type_traits/is_array.hpp>
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// Must come last.
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#include <boost/iostreams/detail/config/disable_warnings.hpp> // VC7.1 C4224.
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namespace boost { namespace iostreams { namespace detail {
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//------------------Definition of resolve-------------------------------------//
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#ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //-------------------------//
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template<typename Mode, typename Ch, typename T>
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struct resolve_traits {
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typedef typename
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mpl::if_<
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boost::detail::is_incrementable<T>,
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output_iterator_adapter<Mode, Ch, T>,
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const T&
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>::type type;
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};
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# ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------//
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve( const T& t
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(T)
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// I suspect that the compilers which require this workaround may
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// be correct, but I'm not sure why :(
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#if BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, BOOST_TESTED_AT(810)) ||\
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BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3205)) || \
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BOOST_WORKAROUND(BOOST_IOSTREAMS_GCC, BOOST_TESTED_AT(400)) ||\
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BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(1110))
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/**/
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, typename disable_if< is_iterator_range<T> >::type* = 0
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#endif
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)
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{
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typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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return return_type(t);
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}
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template<typename Mode, typename Ch, typename Tr>
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mode_adapter< Mode, std::basic_streambuf<Ch, Tr> >
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resolve(std::basic_streambuf<Ch, Tr>& sb)
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{ return mode_adapter< Mode, std::basic_streambuf<Ch, Tr> >(wrap(sb)); }
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template<typename Mode, typename Ch, typename Tr>
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mode_adapter< Mode, std::basic_istream<Ch, Tr> >
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resolve(std::basic_istream<Ch, Tr>& is)
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{ return mode_adapter< Mode, std::basic_istream<Ch, Tr> >(wrap(is)); }
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template<typename Mode, typename Ch, typename Tr>
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mode_adapter< Mode, std::basic_ostream<Ch, Tr> >
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resolve(std::basic_ostream<Ch, Tr>& os)
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{ return mode_adapter< Mode, std::basic_ostream<Ch, Tr> >(wrap(os)); }
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template<typename Mode, typename Ch, typename Tr>
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mode_adapter< Mode, std::basic_iostream<Ch, Tr> >
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resolve(std::basic_iostream<Ch, Tr>& io)
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{ return mode_adapter< Mode, std::basic_iostream<Ch, Tr> >(wrap(io)); }
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template<typename Mode, typename Ch, std::size_t N>
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array_adapter<Mode, Ch> resolve(Ch (&array)[N])
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{ return array_adapter<Mode, Ch>(array); }
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template<typename Mode, typename Ch, typename Iter>
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range_adapter< Mode, boost::iterator_range<Iter> >
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resolve(const boost::iterator_range<Iter>& rng)
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{ return range_adapter< Mode, boost::iterator_range<Iter> >(rng); }
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# else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------//
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve( const T& t
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(T)
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#if defined(__GNUC__)
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, typename disable_if< is_iterator_range<T> >::type* = 0
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#endif
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)
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{
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typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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return return_type(t);
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}
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template<typename Mode, typename Ch>
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mode_adapter<Mode, std::streambuf>
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resolve(std::streambuf& sb)
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{ return mode_adapter<Mode, std::streambuf>(wrap(sb)); }
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template<typename Mode, typename Ch>
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mode_adapter<Mode, std::istream>
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resolve(std::istream& is)
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{ return mode_adapter<Mode, std::istream>(wrap(is)); }
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template<typename Mode, typename Ch>
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mode_adapter<Mode, std::ostream>
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resolve(std::ostream& os)
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{ return mode_adapter<Mode, std::ostream>(wrap(os)); }
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template<typename Mode, typename Ch>
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mode_adapter<Mode, std::iostream>
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resolve(std::iostream& io)
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{ return mode_adapter<Mode, std::iostream>(wrap(io)); }
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template<typename Mode, typename Ch, std::size_t N>
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array_adapter<Mode, Ch> resolve(Ch (&array)[N])
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{ return array_adapter<Mode, Ch>(array); }
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template<typename Mode, typename Ch, typename Iter>
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range_adapter< Mode, boost::iterator_range<Iter> >
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resolve(const boost::iterator_range<Iter>& rng)
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{ return range_adapter< Mode, boost::iterator_range<Iter> >(rng); }
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# endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------//
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#else // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //----------------//
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template<typename Mode, typename Ch, typename T>
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struct resolve_traits {
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// Note: test for is_iterator_range must come before test for output
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// iterator.
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typedef typename
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iostreams::select< // Disambiguation for Tru64.
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is_std_io<T>,
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mode_adapter<Mode, T>,
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is_iterator_range<T>,
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range_adapter<Mode, T>,
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is_dereferenceable<T>,
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output_iterator_adapter<Mode, Ch, T>,
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is_array<T>,
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array_adapter<Mode, T>,
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else_,
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#if !BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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const T&
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#else
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T
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#endif
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>::type type;
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};
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve(const T& t, mpl::true_)
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{ // Bad overload resolution.
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typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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return return_type(wrap(const_cast<T&>(t)));
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}
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve(const T& t, mpl::false_)
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{
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typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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return return_type(t);
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}
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve(const T& t BOOST_IOSTREAMS_DISABLE_IF_STREAM(T))
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{ return resolve<Mode, Ch>(t, is_std_io<T>()); }
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# if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \
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!defined(__GNUC__) // ---------------------------------------------------//
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve(T& t, mpl::true_)
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{
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typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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return return_type(wrap(t));
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}
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve(T& t, mpl::false_)
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{
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typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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return return_type(t);
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}
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template<typename Mode, typename Ch, typename T>
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typename resolve_traits<Mode, Ch, T>::type
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resolve(T& t BOOST_IOSTREAMS_ENABLE_IF_STREAM(T))
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{ return resolve<Mode, Ch>(t, is_std_io<T>()); }
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# endif // Borland 5.x or GCC //--------------------------------//
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#endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //---------------//
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} } } // End namespaces detail, iostreams, boost.
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#include <boost/iostreams/detail/config/enable_warnings.hpp> // VC7.1 4224.
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#endif // BOOST_IOSTREAMS_DETAIL_RESOLVE_HPP_INCLUDED
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