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const_buffers_iterator.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\asio\detail\const_buffers_iterator.hpp
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// // const_buffers_iterator.hpp // ~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff 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) // #ifndef BOOST_ASIO_DETAIL_CONST_BUFFERS_ITERATOR_HPP #define BOOST_ASIO_DETAIL_CONST_BUFFERS_ITERATOR_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include
#include
#include
#include
#include
#include
#include
namespace boost { namespace asio { namespace detail { // A proxy iterator for a sub-range in a list of buffers. template
class const_buffers_iterator : public boost::iterator_facade
, const char, boost::bidirectional_traversal_tag> { public: // Default constructor creates an iterator in an undefined state. const_buffers_iterator() { } // Create an iterator for the specified position. const_buffers_iterator(const ConstBufferSequence& buffers, std::size_t position) : begin_(buffers.begin()), current_(buffers.begin()), end_(buffers.end()), position_(0) { while (current_ != end_) { current_buffer_ = *current_; std::size_t buffer_size = boost::asio::buffer_size(current_buffer_); if (position - position_ < buffer_size) { current_buffer_position_ = position - position_; position_ = position; return; } position_ += buffer_size; ++current_; } current_buffer_ = boost::asio::const_buffer(); current_buffer_position_ = 0; } std::size_t position() const { return position_; } private: friend class boost::iterator_core_access; void increment() { if (current_ == end_) return; ++position_; ++current_buffer_position_; if (current_buffer_position_ != boost::asio::buffer_size(current_buffer_)) return; ++current_; current_buffer_position_ = 0; while (current_ != end_) { current_buffer_ = *current_; if (boost::asio::buffer_size(current_buffer_) > 0) return; ++current_; } } void decrement() { if (position_ == 0) return; --position_; if (current_buffer_position_ != 0) { --current_buffer_position_; return; } typename ConstBufferSequence::const_iterator iter = current_; while (iter != begin_) { --iter; boost::asio::const_buffer buffer = *iter; std::size_t buffer_size = boost::asio::buffer_size(buffer); if (buffer_size > 0) { current_ = iter; current_buffer_ = buffer; current_buffer_position_ = buffer_size - 1; return; } } } bool equal(const const_buffers_iterator& other) const { return position_ == other.position_; } const char& dereference() const { return boost::asio::buffer_cast
( current_buffer_)[current_buffer_position_]; } boost::asio::const_buffer current_buffer_; std::size_t current_buffer_position_; typename ConstBufferSequence::const_iterator begin_; typename ConstBufferSequence::const_iterator current_; typename ConstBufferSequence::const_iterator end_; std::size_t position_; }; } // namespace detail } // namespace asio } // namespace boost #include
#endif // BOOST_ASIO_DETAIL_CONST_BUFFERS_ITERATOR_HPP
const_buffers_iterator.hpp
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