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-rw-r--r--lib/asio/buffered_stream.hpp278
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-//
-// buffered_stream.hpp
-// ~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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 ASIO_BUFFERED_STREAM_HPP
-#define ASIO_BUFFERED_STREAM_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include <cstddef>
-#include "asio/async_result.hpp"
-#include "asio/buffered_read_stream.hpp"
-#include "asio/buffered_write_stream.hpp"
-#include "asio/buffered_stream_fwd.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/error.hpp"
-#include "asio/io_context.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Adds buffering to the read- and write-related operations of a stream.
-/**
- * The buffered_stream class template can be used to add buffering to the
- * synchronous and asynchronous read and 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 <typename Stream>
-class buffered_stream
- : private noncopyable
-{
-public:
- /// The type of the next layer.
- typedef typename remove_reference<Stream>::type next_layer_type;
-
- /// The type of the lowest layer.
- typedef typename next_layer_type::lowest_layer_type lowest_layer_type;
-
- /// The type of the executor associated with the object.
- typedef typename lowest_layer_type::executor_type executor_type;
-
- /// Construct, passing the specified argument to initialise the next layer.
- template <typename Arg>
- explicit buffered_stream(Arg& a)
- : inner_stream_impl_(a),
- stream_impl_(inner_stream_impl_)
- {
- }
-
- /// Construct, passing the specified argument to initialise the next layer.
- template <typename Arg>
- explicit buffered_stream(Arg& a, std::size_t read_buffer_size,
- std::size_t write_buffer_size)
- : inner_stream_impl_(a, write_buffer_size),
- stream_impl_(inner_stream_impl_, read_buffer_size)
- {
- }
-
- /// Get a reference to the next layer.
- next_layer_type& next_layer()
- {
- return stream_impl_.next_layer().next_layer();
- }
-
- /// Get a reference to the lowest layer.
- lowest_layer_type& lowest_layer()
- {
- return stream_impl_.lowest_layer();
- }
-
- /// Get a const reference to the lowest layer.
- const lowest_layer_type& lowest_layer() const
- {
- return stream_impl_.lowest_layer();
- }
-
- /// Get the executor associated with the object.
- executor_type get_executor() ASIO_NOEXCEPT
- {
- return stream_impl_.lowest_layer().get_executor();
- }
-
-#if !defined(ASIO_NO_DEPRECATED)
- /// (Deprecated: Use get_executor().) Get the io_context associated with the
- /// object.
- asio::io_context& get_io_context()
- {
- return stream_impl_.get_io_context();
- }
-
- /// (Deprecated: Use get_executor().) Get the io_context associated with the
- /// object.
- asio::io_context& get_io_service()
- {
- return stream_impl_.get_io_service();
- }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
- /// Close the stream.
- void close()
- {
- stream_impl_.close();
- }
-
- /// Close the stream.
- ASIO_SYNC_OP_VOID close(asio::error_code& ec)
- {
- stream_impl_.close(ec);
- ASIO_SYNC_OP_VOID_RETURN(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()
- {
- return stream_impl_.next_layer().flush();
- }
-
- /// 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(asio::error_code& ec)
- {
- return stream_impl_.next_layer().flush(ec);
- }
-
- /// Start an asynchronous flush.
- template <typename WriteHandler>
- ASIO_INITFN_RESULT_TYPE(WriteHandler,
- void (asio::error_code, std::size_t))
- async_flush(ASIO_MOVE_ARG(WriteHandler) handler)
- {
- return stream_impl_.next_layer().async_flush(
- ASIO_MOVE_CAST(WriteHandler)(handler));
- }
-
- /// Write the given data to the stream. Returns the number of bytes written.
- /// Throws an exception on failure.
- template <typename ConstBufferSequence>
- std::size_t write_some(const ConstBufferSequence& buffers)
- {
- return stream_impl_.write_some(buffers);
- }
-
- /// Write the given data to the stream. Returns the number of bytes written,
- /// or 0 if an error occurred.
- template <typename ConstBufferSequence>
- std::size_t write_some(const ConstBufferSequence& buffers,
- asio::error_code& ec)
- {
- return stream_impl_.write_some(buffers, ec);
- }
-
- /// Start an asynchronous write. The data being written must be valid for the
- /// lifetime of the asynchronous operation.
- template <typename ConstBufferSequence, typename WriteHandler>
- ASIO_INITFN_RESULT_TYPE(WriteHandler,
- void (asio::error_code, std::size_t))
- async_write_some(const ConstBufferSequence& buffers,
- ASIO_MOVE_ARG(WriteHandler) handler)
- {
- return stream_impl_.async_write_some(buffers,
- ASIO_MOVE_CAST(WriteHandler)(handler));
- }
-
- /// Fill the buffer with some data. Returns the number of bytes placed in the
- /// buffer as a result of the operation. Throws an exception on failure.
- std::size_t fill()
- {
- return stream_impl_.fill();
- }
-
- /// Fill the buffer with some data. Returns the number of bytes placed in the
- /// buffer as a result of the operation, or 0 if an error occurred.
- std::size_t fill(asio::error_code& ec)
- {
- return stream_impl_.fill(ec);
- }
-
- /// Start an asynchronous fill.
- template <typename ReadHandler>
- ASIO_INITFN_RESULT_TYPE(ReadHandler,
- void (asio::error_code, std::size_t))
- async_fill(ASIO_MOVE_ARG(ReadHandler) handler)
- {
- return stream_impl_.async_fill(ASIO_MOVE_CAST(ReadHandler)(handler));
- }
-
- /// Read some data from the stream. Returns the number of bytes read. Throws
- /// an exception on failure.
- template <typename MutableBufferSequence>
- std::size_t read_some(const MutableBufferSequence& buffers)
- {
- return stream_impl_.read_some(buffers);
- }
-
- /// Read some data from the stream. Returns the number of bytes read or 0 if
- /// an error occurred.
- template <typename MutableBufferSequence>
- std::size_t read_some(const MutableBufferSequence& buffers,
- asio::error_code& ec)
- {
- return stream_impl_.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 <typename MutableBufferSequence, typename ReadHandler>
- ASIO_INITFN_RESULT_TYPE(ReadHandler,
- void (asio::error_code, std::size_t))
- async_read_some(const MutableBufferSequence& buffers,
- ASIO_MOVE_ARG(ReadHandler) handler)
- {
- return stream_impl_.async_read_some(buffers,
- ASIO_MOVE_CAST(ReadHandler)(handler));
- }
-
- /// Peek at the incoming data on the stream. Returns the number of bytes read.
- /// Throws an exception on failure.
- template <typename MutableBufferSequence>
- std::size_t peek(const MutableBufferSequence& buffers)
- {
- return stream_impl_.peek(buffers);
- }
-
- /// Peek at the incoming data on the stream. Returns the number of bytes read,
- /// or 0 if an error occurred.
- template <typename MutableBufferSequence>
- std::size_t peek(const MutableBufferSequence& buffers,
- asio::error_code& ec)
- {
- return stream_impl_.peek(buffers, ec);
- }
-
- /// Determine the amount of data that may be read without blocking.
- std::size_t in_avail()
- {
- return stream_impl_.in_avail();
- }
-
- /// Determine the amount of data that may be read without blocking.
- std::size_t in_avail(asio::error_code& ec)
- {
- return stream_impl_.in_avail(ec);
- }
-
-private:
- // The buffered write stream.
- typedef buffered_write_stream<Stream> write_stream_type;
- write_stream_type inner_stream_impl_;
-
- // The buffered read stream.
- typedef buffered_read_stream<write_stream_type&> read_stream_type;
- read_stream_type stream_impl_;
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_BUFFERED_STREAM_HPP