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6d5547a Set version to 1.0.0-b34 6fab138 Fix and tidy up CMake build scripts: ccefa54 Set version to 1.0.0-b33 32afe41 Set internal state correctly when writing frames: fe3e20b Add write_frames unit test 578dcd0 Add decorator unit test aaa3733 Use fwrite return value in file_body df66165 Require Visual Studio 2015 Update 3 or later b8e5a21 Set version to 1.0.0-b32 ffb1758 Update CMake scripts for finding packages: b893749 Remove http Writer suspend and resume feature (API Change): 27864fb Add io_service completion invariants tests eba05a7 Set version to 1.0.0-b31 484bcef Fix badge markdown in README.md 5663bea Add missing dynabuf_readstream member 0d7a551 Tidy up build settings 0fd4030 Move the handler, don't copy it git-subtree-dir: src/beast git-subtree-split: 6d5547a32c50ec95832c4779311502555ab0ee1f
125 lines
3.4 KiB
C++
125 lines
3.4 KiB
C++
//
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// Copyright (c) 2013-2017 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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#ifndef BEAST_CONSUMING_BUFFERS_HPP
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#define BEAST_CONSUMING_BUFFERS_HPP
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#include <beast/config.hpp>
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#include <beast/core/buffer_concepts.hpp>
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#include <boost/asio/buffer.hpp>
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#include <cstdint>
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#include <iterator>
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#include <type_traits>
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#include <utility>
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namespace beast {
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/** Adapter to trim the front of a `BufferSequence`.
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This adapter wraps a buffer sequence to create a new sequence
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which may be incrementally consumed. Bytes consumed are removed
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from the front of the buffer. The underlying memory is not changed,
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instead the adapter efficiently iterates through a subset of
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the buffers wrapped.
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The wrapped buffer is not modified, a copy is made instead.
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Ownership of the underlying memory is not transferred, the application
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is still responsible for managing its lifetime.
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@tparam BufferSequence The buffer sequence to wrap.
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*/
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template<class BufferSequence>
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class consuming_buffers
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{
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using iter_type =
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typename BufferSequence::const_iterator;
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BufferSequence bs_;
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iter_type begin_;
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iter_type end_;
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std::size_t skip_ = 0;
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template<class Deduced>
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consuming_buffers(Deduced&& other, std::size_t nbegin)
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: bs_(std::forward<Deduced>(other).bs_)
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, begin_(std::next(bs_.begin(), nbegin))
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, skip_(other.skip_)
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{
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}
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public:
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/** The type for each element in the list of buffers.
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If the buffers in the underlying sequence are convertible to
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`boost::asio::mutable_buffer`, then this type will be
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`boost::asio::mutable_buffer`, else this type will be
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`boost::asio::const_buffer`.
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*/
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#if GENERATING_DOCS
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using value_type = ...;
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#else
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using value_type = typename std::conditional<
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std::is_convertible<typename
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std::iterator_traits<iter_type>::value_type,
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boost::asio::mutable_buffer>::value,
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boost::asio::mutable_buffer,
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boost::asio::const_buffer>::type;
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#endif
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#if GENERATING_DOCS
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/// A bidirectional iterator type that may be used to read elements.
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using const_iterator = implementation_defined;
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#else
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class const_iterator;
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#endif
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/// Move constructor.
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consuming_buffers(consuming_buffers&&);
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/// Copy constructor.
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consuming_buffers(consuming_buffers const&);
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/// Move assignment.
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consuming_buffers& operator=(consuming_buffers&&);
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/// Copy assignment.
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consuming_buffers& operator=(consuming_buffers const&);
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/** Construct to represent a buffer sequence.
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A copy of the buffer sequence is made. Ownership of the
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underlying memory is not transferred or copied.
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*/
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explicit
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consuming_buffers(BufferSequence const& buffers);
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/// Get a bidirectional iterator to the first element.
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const_iterator
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begin() const;
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/// Get a bidirectional iterator to one past the last element.
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const_iterator
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end() const;
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/** Remove bytes from the beginning of the sequence.
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@param n The number of bytes to remove. If this is
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larger than the number of bytes remaining, all the
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bytes remaining are removed.
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*/
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void
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consume(std::size_t n);
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};
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} // beast
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#include <beast/core/impl/consuming_buffers.ipp>
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#endif
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