// (C) Copyright Jonathan Turkanis 2003.

// Distributed under the Boost Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)

// See http://www.boost.org/libs/iostreams for documentation.

#ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED

#define BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED

#if defined(_MSC_VER) && (_MSC_VER >= 1020)

# pragma once

#endif

#include <boost/config.hpp>  // DEDUCED_TYPENAME, MSVC.

#include <boost/detail/workaround.hpp>

#include <boost/iostreams/categories.hpp>

#include <boost/iostreams/flush.hpp>

#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>

#include <boost/iostreams/detail/wrap_unwrap.hpp>

#include <boost/iostreams/operations_fwd.hpp>

#include <boost/iostreams/traits.hpp>

#include <boost/mpl/identity.hpp>

#include <boost/mpl/if.hpp>

#include <boost/type_traits/is_convertible.hpp>

// Must come last.

#include <boost/iostreams/detail/config/disable_warnings.hpp>

#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-----------------------------------//

# include <boost/iostreams/detail/vc6/close.hpp>

#else // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //--------------------------//

namespace boost { namespace iostreams {

namespace detail {

template<typename T>

struct close_impl;

} // End namespace detail.

template<typename T>

void close(T& t, BOOST_IOS::openmode which)

{ detail::close_impl<T>::close(detail::unwrap(t), which); }

template<typename T, typename Sink>

void close(T& t, Sink& snk, BOOST_IOS::openmode which)

{ detail::close_impl<T>::close(detail::unwrap(t), snk, which); }

namespace detail {

//------------------Definition of close_impl----------------------------------//

template<typename T>

struct close_tag {

    typedef typename category_of<T>::type category;

    typedef typename

            mpl::eval_if<

                is_convertible<category, closable_tag>,

                mpl::if_<

                    mpl::or_<

                        is_convertible<category, two_sequence>,

                        is_convertible<category, dual_use>

                    >,

                    two_sequence,

                    closable_tag

                >,

                mpl::identity<any_tag>

            >::type type;

};

template<typename T>

struct close_impl

    : mpl::if_<

          is_custom<T>,

          operations<T>,

          close_impl<BOOST_DEDUCED_TYPENAME close_tag<T>::type>

      >::type

    { };

template<>

struct close_impl<any_tag> {

    template<typename T>

    static void close(T& t, BOOST_IOS::openmode which)

    {

        if ((which & BOOST_IOS::out) != 0)

            iostreams::flush(t);

    }

    template<typename T, typename Sink>

    static void close(T& t, Sink& snk, BOOST_IOS::openmode which)

    {

        if ((which & BOOST_IOS::out) != 0) {

            non_blocking_adapter<Sink> nb(snk);

            iostreams::flush(t, nb);

        }

    }

};

#include <boost/iostreams/detail/config/disable_warnings.hpp> // Borland.

template<>

struct close_impl<closable_tag> {

    template<typename T>

    static void close(T& t, BOOST_IOS::openmode which)

    {

        typedef typename category_of<T>::type category;

        const bool in =  is_convertible<category, input>::value &&

                        !is_convertible<category, output>::value;

        if (in == ((which & BOOST_IOS::in) != 0))

            t.close();

    }

    template<typename T, typename Sink>

    static void close(T& t, Sink& snk, BOOST_IOS::openmode which)

    {

        typedef typename category_of<T>::type category;

        const bool in =  is_convertible<category, input>::value &&

                        !is_convertible<category, output>::value;

        if (in == ((which & BOOST_IOS::in) != 0)) {

            non_blocking_adapter<Sink> nb(snk);

            t.close(nb);

        }

    }

};

template<>

struct close_impl<two_sequence> {

    template<typename T>

    static void close(T& t, BOOST_IOS::openmode which) { t.close(which); }

    template<typename T, typename Sink>

    static void close(T& t, Sink& snk, BOOST_IOS::openmode which)

    {

        non_blocking_adapter<Sink> nb(snk);

        t.close(nb, which);

    }

};

} // End namespace detail.

} } // End namespaces iostreams, boost.

#endif // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-------------------------//

#include <boost/iostreams/detail/config/enable_warnings.hpp>

#endif // #ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED