[857] | 1 | // (C) Copyright Jonathan Turkanis 2003.
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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| 4 |
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| 5 | // See http://www.boost.org/libs/iostreams for documentation.
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| 6 |
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| 7 | #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
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| 8 | #define BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
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| 9 |
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| 10 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 11 | # pragma once
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| 12 | #endif
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| 13 |
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| 14 | #include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
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| 15 | #include <boost/detail/workaround.hpp>
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| 16 | #include <boost/iostreams/constants.hpp> // constants.
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| 17 | #include <boost/iostreams/detail/dispatch.hpp>
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| 18 | #include <boost/iostreams/detail/wrap_unwrap.hpp>
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| 19 | #include <boost/iostreams/operations_fwd.hpp>
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| 20 | #include <boost/mpl/if.hpp>
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| 21 |
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| 22 | // Must come last.
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| 23 | #include <boost/iostreams/detail/config/disable_warnings.hpp>
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| 24 |
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| 25 | namespace boost { namespace iostreams {
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| 26 |
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| 27 | namespace detail {
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| 28 |
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| 29 | template<typename T>
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| 30 | struct optimal_buffer_size_impl;
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| 31 |
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| 32 | } // End namespace detail.
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| 33 |
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| 34 | template<typename T>
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| 35 | std::streamsize optimal_buffer_size(const T& t)
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| 36 | {
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| 37 | typedef detail::optimal_buffer_size_impl<T> impl;
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| 38 | return impl::optimal_buffer_size(detail::unwrap(t));
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| 39 | }
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| 40 |
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| 41 | namespace detail {
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| 42 |
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| 43 | //------------------Definition of optimal_buffer_size_impl--------------------//
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| 44 |
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| 45 | template<typename T>
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| 46 | struct optimal_buffer_size_impl
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| 47 | : mpl::if_<
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| 48 | is_custom<T>,
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| 49 | operations<T>,
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| 50 | optimal_buffer_size_impl<
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| 51 | BOOST_DEDUCED_TYPENAME
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| 52 | dispatch<
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| 53 | T, optimally_buffered_tag, device_tag, filter_tag
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| 54 | >::type
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| 55 | >
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| 56 | >::type
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| 57 | { };
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| 58 |
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| 59 | template<>
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| 60 | struct optimal_buffer_size_impl<optimally_buffered_tag> {
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| 61 | template<typename T>
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| 62 | static std::streamsize optimal_buffer_size(const T& t)
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| 63 | { return t.optimal_buffer_size(); }
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| 64 | };
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| 65 |
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| 66 | template<>
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| 67 | struct optimal_buffer_size_impl<device_tag> {
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| 68 | template<typename T>
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| 69 | static std::streamsize optimal_buffer_size(const T&)
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| 70 | { return default_device_buffer_size; }
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| 71 | };
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| 72 |
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| 73 | template<>
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| 74 | struct optimal_buffer_size_impl<filter_tag> {
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| 75 | template<typename T>
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| 76 | static std::streamsize optimal_buffer_size(const T&)
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| 77 | { return default_filter_buffer_size; }
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| 78 | };
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| 79 |
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| 80 | } // End namespace detail.
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| 81 |
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| 82 | } } // End namespaces iostreams, boost.
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| 83 |
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| 84 | #include <boost/iostreams/detail/config/enable_warnings.hpp>
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| 85 |
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| 86 | #endif // #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED
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