58de70e3c1
git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@18 52acb1d6-8a22-11de-b505-999d5b087335
134 lines
3.3 KiB
C++
134 lines
3.3 KiB
C++
//
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// consuming_buffers.hpp
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// ~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2005 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 BOOST_ASIO_DETAIL_CONSUMING_BUFFERS_HPP
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#define BOOST_ASIO_DETAIL_CONSUMING_BUFFERS_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 <boost/asio/detail/push_options.hpp>
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#include <boost/asio/detail/push_options.hpp>
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#include <algorithm>
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#include <cstddef>
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#include <boost/config.hpp>
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#include <boost/asio/detail/pop_options.hpp>
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#include <boost/asio/buffer.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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// A proxy for a sub-range in a list of buffers.
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template <typename Buffers>
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class consuming_buffers
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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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typedef typename Buffers::value_type value_type;
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// A forward-only iterator type that may be used to read or modify elements.
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typedef typename Buffers::iterator iterator;
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// A forward-only iterator type that may be used to read elements.
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typedef typename Buffers::const_iterator const_iterator;
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// Construct to represent the entire list of buffers.
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consuming_buffers(const Buffers& buffers)
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: buffers_(buffers),
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begin_(buffers_.begin())
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{
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}
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// Copy constructor.
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consuming_buffers(const consuming_buffers& other)
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: buffers_(other.buffers_),
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begin_(buffers_.begin())
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{
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const_iterator first = other.buffers_.begin();
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const_iterator second = other.begin_;
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std::advance(begin_, std::distance(first, second));
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}
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// Assignment operator.
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consuming_buffers& operator=(const consuming_buffers& other)
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{
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buffers_ = other.buffers_;
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begin_ = buffers_.begin();
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const_iterator first = other.buffers_.begin();
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const_iterator second = other.begin_;
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std::advance(begin_, std::distance(first, second));
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return *this;
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}
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// Get a forward-only iterator to the first element.
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iterator begin()
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{
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return begin_;
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}
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// Get a forward-only iterator to the first element.
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const_iterator begin() const
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{
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return begin_;
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}
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// Get a forward-only iterator for one past the last element.
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iterator end()
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{
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return buffers_.end();
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}
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// Get a forward-only iterator for one past the last element.
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const_iterator end() const
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{
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return buffers_.end();
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}
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// Consume the specified number of bytes from the buffers.
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void consume(std::size_t size)
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{
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// Remove buffers from the start until the specified size is reached.
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while (size > 0 && begin_ != buffers_.end())
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{
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if (buffer_size(*begin_) <= size)
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{
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size -= buffer_size(*begin_);
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*begin_ = value_type();
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++begin_;
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}
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else
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{
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*begin_ = *begin_ + size;
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size = 0;
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}
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}
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// Remove any more empty buffers at the start.
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while (begin_ != buffers_.end() && buffer_size(*begin_) == 0)
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++begin_;
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}
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private:
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Buffers buffers_;
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iterator begin_;
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#endif // BOOST_ASIO_DETAIL_CONSUMING_BUFFERS_HPP
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