// (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_FLUSH_HPP_INCLUDED

#define BOOST_IOSTREAMS_FLUSH_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/detail/dispatch.hpp>

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

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

#include <boost/iostreams/operations_fwd.hpp>

#include <boost/iostreams/traits.hpp>

#include <boost/mpl/if.hpp>

// Must come last.

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

namespace boost { namespace iostreams {

namespace detail {

template<typename T>

struct flush_device_impl;

template<typename T>

struct flush_filter_impl;

} // End namespace detail.

template<typename T>

bool flush(T& t)

{ return detail::flush_device_impl<T>::flush(detail::unwrap(t)); }

template<typename T, typename Sink>

bool flush(T& t, Sink& snk)

{ return detail::flush_filter_impl<T>::flush(detail::unwrap(t), snk); }

namespace detail {

//------------------Definition of flush_device_impl---------------------------//

template<typename T>

struct flush_device_impl

    : mpl::if_<

          is_custom<T>,

          operations<T>,

          flush_device_impl<

              BOOST_DEDUCED_TYPENAME

              dispatch<

                  T, ostream_tag, streambuf_tag, flushable_tag, any_tag

              >::type

          >

      >::type

    { };

template<>

struct flush_device_impl<ostream_tag> {

    template<typename T>

    static bool flush(T& t)

    { return t.rdbuf()->BOOST_IOSTREAMS_PUBSYNC() == 0; }

};

template<>

struct flush_device_impl<streambuf_tag> {

    template<typename T>

    static bool flush(T& t)

    { return t.BOOST_IOSTREAMS_PUBSYNC() == 0; }

};

template<>

struct flush_device_impl<flushable_tag> {

    template<typename T>

    static bool flush(T& t) { return t.flush(); }

};

template<>

struct flush_device_impl<any_tag> {

    template<typename T>

    static bool flush(T&) { return true; }

};

//------------------Definition of flush_filter_impl---------------------------//

template<typename T>

struct flush_filter_impl

    : mpl::if_<

          is_custom<T>,

          operations<T>,

          flush_filter_impl<

              BOOST_DEDUCED_TYPENAME

              dispatch<

                  T, flushable_tag, any_tag

              >::type

          >

      >::type

    { };

template<>

struct flush_filter_impl<flushable_tag> {

    template<typename T, typename Sink>

    static bool flush(T& t, Sink& snk) { return t.flush(snk); }

};

template<>

struct flush_filter_impl<any_tag> {

    template<typename T, typename Sink>

    static bool flush(T&, Sink&) { return false; }

};

} // End namespace detail.

} } // End namespaces iostreams, boost.

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

#endif // #ifndef BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED