//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail 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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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_DETAIL_BUFFER_TRAITS_HPP
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#define BOOST_BEAST_DETAIL_BUFFER_TRAITS_HPP
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#include <boost/asio/buffer.hpp>
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#include <boost/config/workaround.hpp>
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#include <boost/type_traits/make_void.hpp>
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#include <cstdint>
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#include <type_traits>
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namespace boost {
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namespace beast {
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namespace detail {
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
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template<class T>
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struct buffers_iterator_type_helper
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{
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using type = decltype(
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net::buffer_sequence_begin(
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std::declval<T const&>()));
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};
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template<>
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struct buffers_iterator_type_helper<
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net::const_buffer>
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{
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using type = net::const_buffer const*;
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};
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template<>
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struct buffers_iterator_type_helper<
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net::mutable_buffer>
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{
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using type = net::mutable_buffer const*;
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};
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#endif
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struct buffer_bytes_impl
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{
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std::size_t
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operator()(net::const_buffer b) const noexcept
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{
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return net::const_buffer(b).size();
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}
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std::size_t
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operator()(net::mutable_buffer b) const noexcept
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{
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return net::mutable_buffer(b).size();
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}
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template<
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class B,
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class = typename std::enable_if<
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net::is_const_buffer_sequence<B>::value>::type>
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std::size_t
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operator()(B const& b) const noexcept
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{
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using net::buffer_size;
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return buffer_size(b);
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}
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};
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/** Return `true` if a buffer sequence is empty
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This is sometimes faster than using @ref buffer_bytes
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*/
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template<class ConstBufferSequence>
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bool
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buffers_empty(ConstBufferSequence const& buffers)
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{
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auto it = net::buffer_sequence_begin(buffers);
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auto end = net::buffer_sequence_end(buffers);
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while(it != end)
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{
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if(net::const_buffer(*it).size() > 0)
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return false;
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++it;
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}
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return true;
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}
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} // detail
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} // beast
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} // boost
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#endif
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