| [857] | 1 | // (C) Copyright Jonathan Turkanis 2003.
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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| 4 |
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| 5 | // See http://www.boost.org/libs/iostreams for documentation.
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| 6 |
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| 7 | #ifndef BOOST_IOSTREAMS_DETAIL_RESOLVE_HPP_INCLUDED
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| 8 | #define BOOST_IOSTREAMS_DETAIL_RESOLVE_HPP_INCLUDED
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| 9 |
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| 10 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 11 | # pragma once
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| 12 | #endif
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| 13 |
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| 14 | #include <boost/config.hpp> // partial spec, put size_t in std.
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| 15 | #include <cstddef> // std::size_t.
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| 16 | #include <boost/detail/is_incrementable.hpp>
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| 17 | #include <boost/detail/workaround.hpp>
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| 18 | #include <boost/iostreams/detail/adapter/mode_adapter.hpp>
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| 19 | #include <boost/iostreams/detail/adapter/output_iterator_adapter.hpp>
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| 20 | #include <boost/iostreams/detail/adapter/range_adapter.hpp>
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| 21 | #include <boost/iostreams/detail/config/gcc.hpp>
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| 22 | #include <boost/iostreams/detail/config/overload_resolution.hpp>
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| 23 | #include <boost/iostreams/detail/config/wide_streams.hpp>
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| 24 | #include <boost/iostreams/detail/enable_if_stream.hpp>
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| 25 | #include <boost/iostreams/detail/is_dereferenceable.hpp>
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| 26 | #include <boost/iostreams/detail/is_iterator_range.hpp>
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| 27 | #include <boost/iostreams/detail/select.hpp>
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| 28 | #include <boost/iostreams/detail/wrap_unwrap.hpp>
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| 29 | #include <boost/iostreams/device/array.hpp>
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| 30 | #include <boost/iostreams/traits.hpp>
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| 31 | #include <boost/mpl/and.hpp>
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| 32 | #include <boost/mpl/bool.hpp> // true_.
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| 33 | #include <boost/mpl/if.hpp>
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| 34 | #include <boost/range/iterator_range.hpp>
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| 35 | #include <boost/type_traits/is_array.hpp>
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| 36 |
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| 37 | // Must come last.
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| 38 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // VC7.1 C4224.
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| 39 |
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| 40 | namespace boost { namespace iostreams { namespace detail {
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| 41 |
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| 42 | //------------------Definition of resolve-------------------------------------//
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| 43 |
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| 44 | #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //-------------------------//
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| 45 |
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| 46 | template<typename Mode, typename Ch, typename T>
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| 47 | struct resolve_traits {
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| 48 | typedef typename
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| 49 | mpl::if_<
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| 50 | boost::detail::is_incrementable<T>,
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| 51 | output_iterator_adapter<Mode, Ch, T>,
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| 52 | const T&
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| 53 | >::type type;
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| 54 | };
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| 55 |
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| 56 | # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------//
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| 57 |
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| 58 | template<typename Mode, typename Ch, typename T>
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| 59 | typename resolve_traits<Mode, Ch, T>::type
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| 60 | resolve( const T& t
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| 61 | BOOST_IOSTREAMS_DISABLE_IF_STREAM(T)
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| 62 |
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| 63 | // I suspect that the compilers which require this workaround may
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| 64 | // be correct, but I'm not sure why :(
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| 65 | #if BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, BOOST_TESTED_AT(810)) ||\
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| 66 | BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3205)) || \
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| 67 | BOOST_WORKAROUND(BOOST_IOSTREAMS_GCC, BOOST_TESTED_AT(400)) \
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| 68 | /**/
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| 69 | , typename disable_if< is_iterator_range<T> >::type* = 0
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| 70 | #endif
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| 71 | )
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| 72 | {
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| 73 | typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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| 74 | return return_type(t);
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| 75 | }
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| 76 |
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| 77 | template<typename Mode, typename Ch, typename Tr>
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| 78 | mode_adapter< Mode, std::basic_streambuf<Ch, Tr> >
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| 79 | resolve(std::basic_streambuf<Ch, Tr>& sb)
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| 80 | { return mode_adapter< Mode, std::basic_streambuf<Ch, Tr> >(wrap(sb)); }
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| 81 |
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| 82 | template<typename Mode, typename Ch, typename Tr>
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| 83 | mode_adapter< Mode, std::basic_istream<Ch, Tr> >
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| 84 | resolve(std::basic_istream<Ch, Tr>& is)
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| 85 | { return mode_adapter< Mode, std::basic_istream<Ch, Tr> >(wrap(is)); }
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| 86 |
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| 87 | template<typename Mode, typename Ch, typename Tr>
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| 88 | mode_adapter< Mode, std::basic_ostream<Ch, Tr> >
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| 89 | resolve(std::basic_ostream<Ch, Tr>& os)
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| 90 | { return mode_adapter< Mode, std::basic_ostream<Ch, Tr> >(wrap(os)); }
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| 91 |
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| 92 | template<typename Mode, typename Ch, typename Tr>
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| 93 | mode_adapter< Mode, std::basic_iostream<Ch, Tr> >
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| 94 | resolve(std::basic_iostream<Ch, Tr>& io)
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| 95 | { return mode_adapter< Mode, std::basic_iostream<Ch, Tr> >(wrap(io)); }
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| 96 |
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| 97 | template<typename Mode, typename Ch, std::size_t N>
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| 98 | array_adapter<Mode, Ch> resolve(Ch (&array)[N])
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| 99 | { return array_adapter<Mode, Ch>(array); }
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| 100 |
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| 101 | template<typename Mode, typename Ch, typename Iter>
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| 102 | range_adapter< Mode, boost::iterator_range<Iter> >
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| 103 | resolve(const boost::iterator_range<Iter>& rng)
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| 104 | { return range_adapter< Mode, boost::iterator_range<Iter> >(rng); }
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| 105 |
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| 106 | # else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------//
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| 107 |
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| 108 | template<typename Mode, typename Ch, typename T>
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| 109 | typename resolve_traits<Mode, Ch, T>::type
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| 110 | resolve( const T& t
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| 111 | BOOST_IOSTREAMS_DISABLE_IF_STREAM(T)
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| 112 | #if defined(__GNUC__)
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| 113 | , typename disable_if< is_iterator_range<T> >::type* = 0
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| 114 | #endif
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| 115 | )
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| 116 | {
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| 117 | typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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| 118 | return return_type(t);
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| 119 | }
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| 120 |
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| 121 | template<typename Mode, typename Ch>
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| 122 | mode_adapter<Mode, std::streambuf>
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| 123 | resolve(std::streambuf& sb)
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| 124 | { return mode_adapter<Mode, std::streambuf>(wrap(sb)); }
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| 125 |
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| 126 | template<typename Mode, typename Ch>
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| 127 | mode_adapter<Mode, std::istream>
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| 128 | resolve(std::istream& is)
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| 129 | { return mode_adapter<Mode, std::istream>(wrap(is)); }
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| 130 |
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| 131 | template<typename Mode, typename Ch>
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| 132 | mode_adapter<Mode, std::ostream>
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| 133 | resolve(std::ostream& os)
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| 134 | { return mode_adapter<Mode, std::ostream>(wrap(os)); }
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| 135 |
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| 136 | template<typename Mode, typename Ch>
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| 137 | mode_adapter<Mode, std::iostream>
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| 138 | resolve(std::iostream& io)
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| 139 | { return mode_adapter<Mode, std::iostream>(wrap(io)); }
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| 140 |
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| 141 | template<typename Mode, typename Ch, std::size_t N>
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| 142 | array_adapter<Mode, Ch> resolve(Ch (&array)[N])
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| 143 | { return array_adapter<Mode, Ch>(array); }
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| 144 |
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| 145 | template<typename Mode, typename Ch, typename Iter>
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| 146 | range_adapter< Mode, boost::iterator_range<Iter> >
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| 147 | resolve(const boost::iterator_range<Iter>& rng)
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| 148 | { return range_adapter< Mode, boost::iterator_range<Iter> >(rng); }
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| 149 |
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| 150 | # endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------//
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| 151 | #else // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //----------------//
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| 152 |
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| 153 | template<typename Mode, typename Ch, typename T>
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| 154 | struct resolve_traits {
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| 155 | // Note: test for is_iterator_range must come before test for output
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| 156 | // iterator.
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| 157 | typedef typename
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| 158 | iostreams::select< // Disambiguation for Tru64.
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| 159 | is_std_io<T>,
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| 160 | mode_adapter<Mode, T>,
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| 161 | is_iterator_range<T>,
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| 162 | range_adapter<Mode, T>,
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| 163 | is_dereferenceable<T>,
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| 164 | output_iterator_adapter<Mode, Ch, T>,
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| 165 | is_array<T>,
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| 166 | array_adapter<Mode, T>,
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| 167 | else_,
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| 168 | #if !BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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| 169 | const T&
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| 170 | #else
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| 171 | T
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| 172 | #endif
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| 173 | >::type type;
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| 174 | };
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| 175 |
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| 176 | template<typename Mode, typename Ch, typename T>
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| 177 | typename resolve_traits<Mode, Ch, T>::type
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| 178 | resolve(const T& t, mpl::true_)
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| 179 | { // Bad overload resolution.
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| 180 | typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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| 181 | return return_type(wrap(const_cast<T&>(t)));
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| 182 | }
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| 183 |
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| 184 | template<typename Mode, typename Ch, typename T>
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| 185 | typename resolve_traits<Mode, Ch, T>::type
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| 186 | resolve(const T& t, mpl::false_)
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| 187 | {
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| 188 | typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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| 189 | return return_type(t);
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| 190 | }
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| 191 |
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| 192 | template<typename Mode, typename Ch, typename T>
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| 193 | typename resolve_traits<Mode, Ch, T>::type
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| 194 | resolve(const T& t BOOST_IOSTREAMS_DISABLE_IF_STREAM(T))
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| 195 | { return resolve<Mode, Ch>(t, is_std_io<T>()); }
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| 196 |
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| 197 | # if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \
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| 198 | !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) && \
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| 199 | !defined(__GNUC__) // ---------------------------------------------------//
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| 200 |
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| 201 | template<typename Mode, typename Ch, typename T>
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| 202 | typename resolve_traits<Mode, Ch, T>::type
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| 203 | resolve(T& t, mpl::true_)
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| 204 | {
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| 205 | typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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| 206 | return return_type(wrap(t));
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| 207 | }
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| 208 |
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| 209 | template<typename Mode, typename Ch, typename T>
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| 210 | typename resolve_traits<Mode, Ch, T>::type
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| 211 | resolve(T& t, mpl::false_)
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| 212 | {
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| 213 | typedef typename resolve_traits<Mode, Ch, T>::type return_type;
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| 214 | return return_type(t);
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| 215 | }
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| 216 |
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| 217 | template<typename Mode, typename Ch, typename T>
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| 218 | typename resolve_traits<Mode, Ch, T>::type
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| 219 | resolve(T& t BOOST_IOSTREAMS_ENABLE_IF_STREAM(T))
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| 220 | { return resolve<Mode, Ch>(t, is_std_io<T>()); }
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| 221 |
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| 222 | # endif // Borland 5.x, VC6-7.0 or GCC 2.9x //--------------------------------//
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| 223 | #endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //---------------//
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| 224 |
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| 225 | } } } // End namespaces detail, iostreams, boost.
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| 226 |
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| 227 | #include <boost/iostreams/detail/config/enable_warnings.hpp> // VC7.1 4224.
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| 228 |
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| 229 | #endif // BOOST_IOSTREAMS_DETAIL_RESOLVE_HPP_INCLUDED
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