/Src/Dependencies/Boost/boost/iostreams/detail/vc6/close.hpp

  1// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
  2// (C) Copyright 2005-2007 Jonathan Turkanis
  3// Distributed under the Boost Software License, Version 1.0. (See accompanying
  4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
  5
  6// See http://www.boost.org/libs/iostreams for documentation.
  7
  8namespace boost { namespace iostreams {
  9
 10namespace detail {
 11
 12template<typename T>
 13struct close_impl;
 14
 15} // End namespace detail.
 16
 17template<typename T>
 18void close(T& t) { detail::close_all(t); }
 19
 20template<typename T>
 21void close(T& t, BOOST_IOS::openmode which)
 22{
 23    typedef typename detail::unwrapped_type<T>::type unwrapped;
 24    detail::close_impl<T>::inner<unwrapped>::close(detail::unwrap(t), which);
 25}
 26
 27template<typename T, typename Sink>
 28void close(T& t, Sink& snk, BOOST_IOS::openmode which)
 29{
 30    typedef typename detail::unwrapped_type<T>::type unwrapped;
 31    detail::close_impl<T>::inner<unwrapped>::close(detail::unwrap(t), snk, which);
 32}
 33
 34namespace detail {
 35
 36//------------------Definition of close_impl----------------------------------//
 37
 38template<typename T>
 39struct close_tag {
 40    typedef typename category_of<T>::type category;
 41    typedef typename
 42            mpl::eval_if<
 43                is_convertible<category, closable_tag>,
 44                mpl::if_<
 45                    mpl::or_<
 46                        is_convertible<category, two_sequence>,
 47                        is_convertible<category, dual_use>
 48                    >,
 49                    two_sequence,
 50                    closable_tag
 51                >,
 52                mpl::identity<any_tag>
 53            >::type type;
 54};
 55
 56template<typename T>
 57struct close_impl
 58    : mpl::if_<
 59          is_custom<T>,
 60          operations<T>,
 61          close_impl<BOOST_DEDUCED_TYPENAME close_tag<T>::type>
 62      >::type
 63    { };
 64
 65template<>
 66struct close_impl<any_tag> {
 67    template<typename T>
 68    struct inner {
 69        static void close(T& t, BOOST_IOS::openmode which)
 70        {
 71            if (which == BOOST_IOS::out)
 72                iostreams::flush(t);
 73        }
 74
 75        template<typename Sink>
 76        static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
 77        {
 78            if (which == BOOST_IOS::out) {
 79                non_blocking_adapter<Sink> nb(snk);
 80                iostreams::flush(t, nb);
 81            }
 82        }
 83    };
 84};
 85
 86template<>
 87struct close_impl<closable_tag> {
 88    template<typename T>
 89    struct inner {
 90        static void close(T& t, BOOST_IOS::openmode which)
 91        {
 92            typedef typename category_of<T>::type category;
 93            const bool in =  is_convertible<category, input>::value &&
 94                            !is_convertible<category, output>::value;
 95            if (in == (which == BOOST_IOS::in))
 96                t.close();
 97        }
 98        template<typename Sink>
 99        static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
100        {
101            typedef typename category_of<T>::type category;
102            const bool in =  is_convertible<category, input>::value &&
103                            !is_convertible<category, output>::value;
104            if (in == (which == BOOST_IOS::in)) {
105                non_blocking_adapter<Sink> nb(snk);
106                t.close(nb);
107            }
108        }
109    };
110};
111
112template<>
113struct close_impl<two_sequence> {
114    template<typename T>
115    struct inner {
116        static void close(T& t, BOOST_IOS::openmode which) { t.close(which); }
117
118        template<typename Sink>
119        static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
120        {
121            non_blocking_adapter<Sink> nb(snk);
122            t.close(nb, which);
123        }
124    };
125};
126
127} // End namespace detail.
128
129} } // End namespaces iostreams, boost.