//
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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_BUFFERS_PAIR_HPP
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#define BOOST_BEAST_DETAIL_BUFFERS_PAIR_HPP
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#include <boost/asio/buffer.hpp>
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#include <boost/assert.hpp>
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#include <boost/config/workaround.hpp>
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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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# pragma warning (push)
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# pragma warning (disable: 4521) // multiple copy constructors specified
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# pragma warning (disable: 4522) // multiple assignment operators specified
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#endif
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template<bool isMutable>
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class buffers_pair
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{
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public:
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// VFALCO: This type is public otherwise
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// asio::buffers_iterator won't compile.
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using value_type = typename
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std::conditional<isMutable,
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net::mutable_buffer,
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net::const_buffer>::type;
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using const_iterator = value_type const*;
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buffers_pair() = default;
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
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buffers_pair(buffers_pair const& other)
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: buffers_pair(
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*other.begin(), *(other.begin() + 1))
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{
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}
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buffers_pair&
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operator=(buffers_pair const& other)
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{
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b_[0] = *other.begin();
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b_[1] = *(other.begin() + 1);
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return *this;
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}
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#else
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buffers_pair(buffers_pair const& other) = default;
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buffers_pair& operator=(buffers_pair const& other) = default;
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#endif
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template<
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bool isMutable_ = isMutable,
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class = typename std::enable_if<
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! isMutable_>::type>
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buffers_pair(buffers_pair<true> const& other)
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: buffers_pair(
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*other.begin(), *(other.begin() + 1))
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{
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}
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template<
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bool isMutable_ = isMutable,
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class = typename std::enable_if<
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! isMutable_>::type>
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buffers_pair&
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operator=(buffers_pair<true> const& other)
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{
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b_[0] = *other.begin();
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b_[1] = *(other.begin() + 1);
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return *this;
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}
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buffers_pair(value_type b0, value_type b1)
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: b_{b0, b1}
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{
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}
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const_iterator
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begin() const noexcept
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{
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return &b_[0];
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}
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const_iterator
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end() const noexcept
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{
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if(b_[1].size() > 0)
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return &b_[2];
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return &b_[1];
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}
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private:
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value_type b_[2];
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};
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1910)
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# pragma warning (pop)
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#endif
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} // detail
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} // beast
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} // boost
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#endif
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