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88 lines
2.4 KiB
88 lines
2.4 KiB
3 years ago
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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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_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
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#define BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
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#if defined(_MSC_VER)
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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/constants.hpp> // constants.
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#include <boost/iostreams/detail/dispatch.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/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 optimal_buffer_size_impl;
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} // End namespace detail.
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template<typename T>
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std::streamsize optimal_buffer_size(const T& t)
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{
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typedef detail::optimal_buffer_size_impl<T> impl;
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return impl::optimal_buffer_size(detail::unwrap(t));
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}
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namespace detail {
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//------------------Definition of optimal_buffer_size_impl--------------------//
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template<typename T>
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struct optimal_buffer_size_impl
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: mpl::if_<
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is_custom<T>,
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operations<T>,
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optimal_buffer_size_impl<
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BOOST_DEDUCED_TYPENAME
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dispatch<
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T, optimally_buffered_tag, device_tag, filter_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 optimal_buffer_size_impl<optimally_buffered_tag> {
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template<typename T>
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static std::streamsize optimal_buffer_size(const T& t)
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{ return t.optimal_buffer_size(); }
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};
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template<>
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struct optimal_buffer_size_impl<device_tag> {
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template<typename T>
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static std::streamsize optimal_buffer_size(const T&)
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{ return default_device_buffer_size; }
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};
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template<>
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struct optimal_buffer_size_impl<filter_tag> {
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template<typename T>
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static std::streamsize optimal_buffer_size(const T&)
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{ return default_filter_buffer_size; }
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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_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
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