consuming_buffers.hpp

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//
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//

#ifndef BOOST_BEAST_CONSUMING_BUFFERS_HPP
#define BOOST_BEAST_CONSUMING_BUFFERS_HPP

#include <boost/beast/config.hpp>
#include <boost/beast/core/detail/in_place_init.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/optional.hpp>
#include <cstdint>
#include <iterator>
#include <type_traits>
#include <utility>

namespace boost {
namespace beast {

template<class BufferSequence>
class consuming_buffers
{
    using buffers_type =
        typename std::decay<BufferSequence>::type;

    using iter_type =
        typename buffers_type::const_iterator;

    BufferSequence bs_;
    iter_type begin_;
    std::size_t skip_ = 0;

    template<class Deduced>
    consuming_buffers(Deduced&& other, std::size_t dist)
        : bs_(std::forward<Deduced>(other).bs_)
        , begin_(std::next(bs_.begin(), dist))
        , skip_(other.skip_)
    {
    }

public:
#if BOOST_BEAST_DOXYGEN
    using value_type = implementation_defined;
#else
    using value_type = typename std::conditional<
        std::is_convertible<typename
            std::iterator_traits<iter_type>::value_type,
                boost::asio::mutable_buffer>::value,
                    boost::asio::mutable_buffer,
                        boost::asio::const_buffer>::type;
#endif

#if BOOST_BEAST_DOXYGEN
    using const_iterator = implementation_defined;

#else
    class const_iterator;

#endif

    consuming_buffers();

    consuming_buffers(consuming_buffers&&);

    consuming_buffers(consuming_buffers const&);

    explicit
    consuming_buffers(BufferSequence const& buffers);

    template<class... Args>
    consuming_buffers(boost::in_place_init_t, Args&&... args);

    consuming_buffers& operator=(consuming_buffers&&);

    consuming_buffers& operator=(consuming_buffers const&);

    BufferSequence const&
    get() const
    {
        return bs_;
    }

    const_iterator
    begin() const;

    const_iterator
    end() const;

    void
    consume(std::size_t amount);
};

} // beast
} // boost

#include <boost/beast/core/impl/consuming_buffers.ipp>

#endif