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// (C) Copyright Jonathan Turkanis 2003.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED
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#define BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
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#include <boost/detail/workaround.hpp>
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#include <boost/iostreams/detail/dispatch.hpp>
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#include <boost/iostreams/detail/streambuf.hpp>
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#include <boost/iostreams/detail/wrap_unwrap.hpp>
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#include <boost/iostreams/operations_fwd.hpp>
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#include <boost/iostreams/traits.hpp>
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#include <boost/mpl/if.hpp>
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// Must come last.
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#include <boost/iostreams/detail/config/disable_warnings.hpp>
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namespace boost { namespace iostreams {
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namespace detail {
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template<typename T>
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struct flush_device_impl;
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template<typename T>
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struct flush_filter_impl;
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} // End namespace detail.
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template<typename T>
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bool flush(T& t)
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{ return detail::flush_device_impl<T>::flush(detail::unwrap(t)); }
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template<typename T, typename Sink>
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bool flush(T& t, Sink& snk)
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{ return detail::flush_filter_impl<T>::flush(detail::unwrap(t), snk); }
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namespace detail {
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//------------------Definition of flush_device_impl---------------------------//
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template<typename T>
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struct flush_device_impl
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: mpl::if_<
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is_custom<T>,
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operations<T>,
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flush_device_impl<
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BOOST_DEDUCED_TYPENAME
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dispatch<
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T, ostream_tag, streambuf_tag, flushable_tag, any_tag
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>::type
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>
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>::type
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{ };
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template<>
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struct flush_device_impl<ostream_tag> {
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template<typename T>
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static bool flush(T& t)
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{ return t.rdbuf()->BOOST_IOSTREAMS_PUBSYNC() == 0; }
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};
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template<>
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struct flush_device_impl<streambuf_tag> {
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template<typename T>
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static bool flush(T& t)
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{ return t.BOOST_IOSTREAMS_PUBSYNC() == 0; }
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};
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template<>
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struct flush_device_impl<flushable_tag> {
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template<typename T>
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static bool flush(T& t) { return t.flush(); }
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};
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template<>
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struct flush_device_impl<any_tag> {
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template<typename T>
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static bool flush(T&) { return true; }
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};
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//------------------Definition of flush_filter_impl---------------------------//
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template<typename T>
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struct flush_filter_impl
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: mpl::if_<
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is_custom<T>,
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operations<T>,
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flush_filter_impl<
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BOOST_DEDUCED_TYPENAME
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dispatch<
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T, flushable_tag, any_tag
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>::type
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>
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>::type
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{ };
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template<>
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struct flush_filter_impl<flushable_tag> {
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template<typename T, typename Sink>
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static bool flush(T& t, Sink& snk) { return t.flush(snk); }
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};
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template<>
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struct flush_filter_impl<any_tag> {
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template<typename T, typename Sink>
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static bool flush(T&, Sink&) { return false; }
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};
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} // End namespace detail.
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} } // End namespaces iostreams, boost.
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#include <boost/iostreams/detail/config/enable_warnings.hpp>
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#endif // #ifndef BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED
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