60 lines
1.5 KiB
C++
60 lines
1.5 KiB
C++
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//
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// is_write_buffered.hpp
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// ~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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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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//
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#ifndef ASIO_IS_WRITE_BUFFERED_HPP
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#define ASIO_IS_WRITE_BUFFERED_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include "asio/buffered_stream_fwd.hpp"
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#include "asio/buffered_write_stream_fwd.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename Stream>
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char is_write_buffered_helper(buffered_stream<Stream>* s);
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template <typename Stream>
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char is_write_buffered_helper(buffered_write_stream<Stream>* s);
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struct is_write_buffered_big_type { char data[10]; };
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is_write_buffered_big_type is_write_buffered_helper(...);
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} // namespace detail
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/// The is_write_buffered class is a traits class that may be used to determine
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/// whether a stream type supports buffering of written data.
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template <typename Stream>
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class is_write_buffered
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{
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public:
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#if defined(GENERATING_DOCUMENTATION)
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/// The value member is true only if the Stream type supports buffering of
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/// written data.
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static const bool value;
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#else
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ASIO_STATIC_CONSTANT(bool,
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value = sizeof(detail::is_write_buffered_helper((Stream*)0)) == 1);
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#endif
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};
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_IS_WRITE_BUFFERED_HPP
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