Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2005-2007 Jonathan Turkanis
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // See http://www.boost.org/libs/iostreams for documentation.
Chris@16: 
Chris@16: namespace boost { namespace iostreams {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct close_impl;
Chris@16: 
Chris@16: } // End namespace detail.
Chris@16: 
Chris@16: template<typename T>
Chris@16: void close(T& t) { detail::close_all(t); }
Chris@16: 
Chris@16: template<typename T>
Chris@16: void close(T& t, BOOST_IOS::openmode which)
Chris@16: {
Chris@16:     typedef typename detail::unwrapped_type<T>::type unwrapped;
Chris@16:     detail::close_impl<T>::inner<unwrapped>::close(detail::unwrap(t), which);
Chris@16: }
Chris@16: 
Chris@16: template<typename T, typename Sink>
Chris@16: void close(T& t, Sink& snk, BOOST_IOS::openmode which)
Chris@16: {
Chris@16:     typedef typename detail::unwrapped_type<T>::type unwrapped;
Chris@16:     detail::close_impl<T>::inner<unwrapped>::close(detail::unwrap(t), snk, which);
Chris@16: }
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: //------------------Definition of close_impl----------------------------------//
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct close_tag {
Chris@16:     typedef typename category_of<T>::type category;
Chris@16:     typedef typename
Chris@16:             mpl::eval_if<
Chris@16:                 is_convertible<category, closable_tag>,
Chris@16:                 mpl::if_<
Chris@16:                     mpl::or_<
Chris@16:                         is_convertible<category, two_sequence>,
Chris@16:                         is_convertible<category, dual_use>
Chris@16:                     >,
Chris@16:                     two_sequence,
Chris@16:                     closable_tag
Chris@16:                 >,
Chris@16:                 mpl::identity<any_tag>
Chris@16:             >::type type;
Chris@16: };
Chris@16: 
Chris@16: template<typename T>
Chris@16: struct close_impl
Chris@16:     : mpl::if_<
Chris@16:           is_custom<T>,
Chris@16:           operations<T>,
Chris@16:           close_impl<BOOST_DEDUCED_TYPENAME close_tag<T>::type>
Chris@16:       >::type
Chris@16:     { };
Chris@16: 
Chris@16: template<>
Chris@16: struct close_impl<any_tag> {
Chris@16:     template<typename T>
Chris@16:     struct inner {
Chris@16:         static void close(T& t, BOOST_IOS::openmode which)
Chris@16:         {
Chris@16:             if (which == BOOST_IOS::out)
Chris@16:                 iostreams::flush(t);
Chris@16:         }
Chris@16: 
Chris@16:         template<typename Sink>
Chris@16:         static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
Chris@16:         {
Chris@16:             if (which == BOOST_IOS::out) {
Chris@16:                 non_blocking_adapter<Sink> nb(snk);
Chris@16:                 iostreams::flush(t, nb);
Chris@16:             }
Chris@16:         }
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct close_impl<closable_tag> {
Chris@16:     template<typename T>
Chris@16:     struct inner {
Chris@16:         static void close(T& t, BOOST_IOS::openmode which)
Chris@16:         {
Chris@16:             typedef typename category_of<T>::type category;
Chris@16:             const bool in =  is_convertible<category, input>::value &&
Chris@16:                             !is_convertible<category, output>::value;
Chris@16:             if (in == (which == BOOST_IOS::in))
Chris@16:                 t.close();
Chris@16:         }
Chris@16:         template<typename Sink>
Chris@16:         static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
Chris@16:         {
Chris@16:             typedef typename category_of<T>::type category;
Chris@16:             const bool in =  is_convertible<category, input>::value &&
Chris@16:                             !is_convertible<category, output>::value;
Chris@16:             if (in == (which == BOOST_IOS::in)) {
Chris@16:                 non_blocking_adapter<Sink> nb(snk);
Chris@16:                 t.close(nb);
Chris@16:             }
Chris@16:         }
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct close_impl<two_sequence> {
Chris@16:     template<typename T>
Chris@16:     struct inner {
Chris@16:         static void close(T& t, BOOST_IOS::openmode which) { t.close(which); }
Chris@16: 
Chris@16:         template<typename Sink>
Chris@16:         static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
Chris@16:         {
Chris@16:             non_blocking_adapter<Sink> nb(snk);
Chris@16:             t.close(nb, which);
Chris@16:         }
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: } // End namespace detail.
Chris@16: 
Chris@16: } } // End namespaces iostreams, boost.