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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\asio\buffered_write_stream.hpp
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// // buffered_write_stream.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_BUFFERED_WRITE_STREAM_HPP #define BOOST_ASIO_BUFFERED_WRITE_STREAM_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include
#include
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namespace boost { namespace asio { /// Adds buffering to the write-related operations of a stream. /** * The buffered_write_stream class template can be used to add buffering to the * synchronous and asynchronous write operations of a stream. * * @par Thread Safety * @e Distinct @e objects: Safe.@n * @e Shared @e objects: Unsafe. * * @par Concepts: * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream. */ template
class buffered_write_stream : private noncopyable { public: /// The type of the next layer. typedef typename boost::remove_reference
::type next_layer_type; /// The type of the lowest layer. typedef typename next_layer_type::lowest_layer_type lowest_layer_type; #if defined(GENERATING_DOCUMENTATION) /// The default buffer size. static const std::size_t default_buffer_size = implementation_defined; #else BOOST_STATIC_CONSTANT(std::size_t, default_buffer_size = 1024); #endif /// Construct, passing the specified argument to initialise the next layer. template
explicit buffered_write_stream(Arg& a) : next_layer_(a), storage_(default_buffer_size) { } /// Construct, passing the specified argument to initialise the next layer. template
buffered_write_stream(Arg& a, std::size_t buffer_size) : next_layer_(a), storage_(buffer_size) { } /// Get a reference to the next layer. next_layer_type& next_layer() { return next_layer_; } /// Get a reference to the lowest layer. lowest_layer_type& lowest_layer() { return next_layer_.lowest_layer(); } /// (Deprecated: use get_io_service().) Get the io_service associated with /// the object. boost::asio::io_service& io_service() { return next_layer_.get_io_service(); } /// Get the io_service associated with the object. boost::asio::io_service& get_io_service() { return next_layer_.get_io_service(); } /// Close the stream. void close() { next_layer_.close(); } /// Close the stream. boost::system::error_code close(boost::system::error_code& ec) { return next_layer_.close(ec); } /// Flush all data from the buffer to the next layer. Returns the number of /// bytes written to the next layer on the last write operation. Throws an /// exception on failure. std::size_t flush() { std::size_t bytes_written = write(next_layer_, buffer(storage_.data(), storage_.size())); storage_.consume(bytes_written); return bytes_written; } /// Flush all data from the buffer to the next layer. Returns the number of /// bytes written to the next layer on the last write operation, or 0 if an /// error occurred. std::size_t flush(boost::system::error_code& ec) { std::size_t bytes_written = write(next_layer_, buffer(storage_.data(), storage_.size()), transfer_all(), ec); storage_.consume(bytes_written); return bytes_written; } template
class flush_handler { public: flush_handler(boost::asio::io_service& io_service, detail::buffered_stream_storage& storage, WriteHandler handler) : io_service_(io_service), storage_(storage), handler_(handler) { } void operator()(const boost::system::error_code& ec, std::size_t bytes_written) { storage_.consume(bytes_written); io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_written)); } private: boost::asio::io_service& io_service_; detail::buffered_stream_storage& storage_; WriteHandler handler_; }; /// Start an asynchronous flush. template
void async_flush(WriteHandler handler) { async_write(next_layer_, buffer(storage_.data(), storage_.size()), flush_handler
(get_io_service(), storage_, handler)); } /// Write the given data to the stream. Returns the number of bytes written. /// Throws an exception on failure. template
std::size_t write_some(const ConstBufferSequence& buffers) { if (storage_.size() == storage_.capacity()) flush(); return copy(buffers); } /// Write the given data to the stream. Returns the number of bytes written, /// or 0 if an error occurred and the error handler did not throw. template
std::size_t write_some(const ConstBufferSequence& buffers, boost::system::error_code& ec) { ec = boost::system::error_code(); if (storage_.size() == storage_.capacity() && !flush(ec)) return 0; return copy(buffers); } template
class write_some_handler { public: write_some_handler(boost::asio::io_service& io_service, detail::buffered_stream_storage& storage, const ConstBufferSequence& buffers, WriteHandler handler) : io_service_(io_service), storage_(storage), buffers_(buffers), handler_(handler) { } void operator()(const boost::system::error_code& ec, std::size_t) { if (ec) { std::size_t length = 0; io_service_.dispatch(detail::bind_handler(handler_, ec, length)); } else { using namespace std; // For memcpy. std::size_t orig_size = storage_.size(); std::size_t space_avail = storage_.capacity() - orig_size; std::size_t bytes_copied = 0; typename ConstBufferSequence::const_iterator iter = buffers_.begin(); typename ConstBufferSequence::const_iterator end = buffers_.end(); for (; iter != end && space_avail > 0; ++iter) { std::size_t bytes_avail = buffer_size(*iter); std::size_t length = (bytes_avail < space_avail) ? bytes_avail : space_avail; storage_.resize(orig_size + bytes_copied + length); memcpy(storage_.data() + orig_size + bytes_copied, buffer_cast
(*iter), length); bytes_copied += length; space_avail -= length; } io_service_.dispatch(detail::bind_handler(handler_, ec, bytes_copied)); } } private: boost::asio::io_service& io_service_; detail::buffered_stream_storage& storage_; ConstBufferSequence buffers_; WriteHandler handler_; }; /// Start an asynchronous write. The data being written must be valid for the /// lifetime of the asynchronous operation. template
void async_write_some(const ConstBufferSequence& buffers, WriteHandler handler) { if (storage_.size() == storage_.capacity()) { async_flush(write_some_handler
( get_io_service(), storage_, buffers, handler)); } else { std::size_t bytes_copied = copy(buffers); get_io_service().post(detail::bind_handler( handler, boost::system::error_code(), bytes_copied)); } } /// Read some data from the stream. Returns the number of bytes read. Throws /// an exception on failure. template
std::size_t read_some(const MutableBufferSequence& buffers) { return next_layer_.read_some(buffers); } /// Read some data from the stream. Returns the number of bytes read or 0 if /// an error occurred. template
std::size_t read_some(const MutableBufferSequence& buffers, boost::system::error_code& ec) { return next_layer_.read_some(buffers, ec); } /// Start an asynchronous read. The buffer into which the data will be read /// must be valid for the lifetime of the asynchronous operation. template
void async_read_some(const MutableBufferSequence& buffers, ReadHandler handler) { next_layer_.async_read_some(buffers, handler); } /// Peek at the incoming data on the stream. Returns the number of bytes read. /// Throws an exception on failure. template
std::size_t peek(const MutableBufferSequence& buffers) { return next_layer_.peek(buffers); } /// Peek at the incoming data on the stream. Returns the number of bytes read, /// or 0 if an error occurred. template
std::size_t peek(const MutableBufferSequence& buffers, boost::system::error_code& ec) { return next_layer_.peek(buffers, ec); } /// Determine the amount of data that may be read without blocking. std::size_t in_avail() { return next_layer_.in_avail(); } /// Determine the amount of data that may be read without blocking. std::size_t in_avail(boost::system::error_code& ec) { return next_layer_.in_avail(ec); } private: /// Copy data into the internal buffer from the specified source buffer. /// Returns the number of bytes copied. template
std::size_t copy(const ConstBufferSequence& buffers) { using namespace std; // For memcpy. std::size_t orig_size = storage_.size(); std::size_t space_avail = storage_.capacity() - orig_size; std::size_t bytes_copied = 0; typename ConstBufferSequence::const_iterator iter = buffers.begin(); typename ConstBufferSequence::const_iterator end = buffers.end(); for (; iter != end && space_avail > 0; ++iter) { std::size_t bytes_avail = buffer_size(*iter); std::size_t length = (bytes_avail < space_avail) ? bytes_avail : space_avail; storage_.resize(orig_size + bytes_copied + length); memcpy(storage_.data() + orig_size + bytes_copied, buffer_cast
(*iter), length); bytes_copied += length; space_avail -= length; } return bytes_copied; } /// The next layer. Stream next_layer_; // The data in the buffer. detail::buffered_stream_storage storage_; }; } // namespace asio } // namespace boost #include
#endif // BOOST_ASIO_BUFFERED_WRITE_STREAM_HPP
buffered_write_stream.hpp
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