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+//
+// basic_random_access_handle.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_WINDOWS_BASIC_RANDOM_ACCESS_HANDLE_HPP
+#define BOOST_ASIO_WINDOWS_BASIC_RANDOM_ACCESS_HANDLE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <cstddef>
+#include <boost/config.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/error.hpp>
+#include <boost/asio/windows/basic_handle.hpp>
+#include <boost/asio/windows/random_access_handle_service.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+
+#if defined(BOOST_ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
+  || defined(GENERATING_DOCUMENTATION)
+
+namespace boost {
+namespace asio {
+namespace windows {
+
+/// Provides random-access handle functionality.
+/**
+ * The windows::basic_random_access_handle class template provides asynchronous
+ * and blocking random-access handle functionality.
+ *
+ * @par Thread Safety
+ * @e Distinct @e objects: Safe.@n
+ * @e Shared @e objects: Unsafe.
+ */
+template <typename RandomAccessHandleService = random_access_handle_service>
+class basic_random_access_handle
+  : public basic_handle<RandomAccessHandleService>
+{
+public:
+  /// The native representation of a handle.
+  typedef typename RandomAccessHandleService::native_type native_type;
+
+  /// Construct a basic_random_access_handle without opening it.
+  /**
+   * This constructor creates a random-access handle without opening it. The
+   * handle needs to be opened before data can be written to or or read from it.
+   *
+   * @param io_service The io_service object that the random-access handle will
+   * use to dispatch handlers for any asynchronous operations performed on the
+   * handle.
+   */
+  explicit basic_random_access_handle(boost::asio::io_service& io_service)
+    : basic_handle<RandomAccessHandleService>(io_service)
+  {
+  }
+
+  /// Construct a basic_random_access_handle on an existing native handle.
+  /**
+   * This constructor creates a random-access handle object to hold an existing
+   * native handle.
+   *
+   * @param io_service The io_service object that the random-access handle will
+   * use to dispatch handlers for any asynchronous operations performed on the
+   * handle.
+   *
+   * @param native_handle The new underlying handle implementation.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   */
+  basic_random_access_handle(boost::asio::io_service& io_service,
+      const native_type& native_handle)
+    : basic_handle<RandomAccessHandleService>(io_service, native_handle)
+  {
+  }
+
+  /// Write some data to the handle at the specified offset.
+  /**
+   * This function is used to write data to the random-access handle. The
+   * function call will block until one or more bytes of the data has been
+   * written successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @returns The number of bytes written.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The write_some_at operation may not write all of the data. Consider
+   * using the @ref write_at function if you need to ensure that all data is
+   * written before the blocking operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.write_some_at(42, boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(boost::uint64_t offset,
+      const ConstBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = this->service.write_some_at(
+        this->implementation, offset, buffers, ec);
+    boost::asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Write some data to the handle at the specified offset.
+  /**
+   * This function is used to write data to the random-access handle. The
+   * function call will block until one or more bytes of the data has been
+   * written successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes written. Returns 0 if an error occurred.
+   *
+   * @note The write_some operation may not transmit all of the data to the
+   * peer. Consider using the @ref write_at function if you need to ensure that
+   * all data is written before the blocking operation completes.
+   */
+  template <typename ConstBufferSequence>
+  std::size_t write_some_at(boost::uint64_t offset,
+      const ConstBufferSequence& buffers, boost::system::error_code& ec)
+  {
+    return this->service.write_some_at(
+        this->implementation, offset, buffers, ec);
+  }
+
+  /// Start an asynchronous write at the specified offset.
+  /**
+   * This function is used to asynchronously write data to the random-access
+   * handle. The function call always returns immediately.
+   *
+   * @param offset The offset at which the data will be written.
+   *
+   * @param buffers One or more data buffers to be written to the handle.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the write operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes written.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * boost::asio::io_service::post().
+   *
+   * @note The write operation may not transmit all of the data to the peer.
+   * Consider using the @ref async_write_at function if you need to ensure that
+   * all data is written before the asynchronous operation completes.
+   *
+   * @par Example
+   * To write a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_write_some_at(42, boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on writing multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename ConstBufferSequence, typename WriteHandler>
+  void async_write_some_at(boost::uint64_t offset,
+      const ConstBufferSequence& buffers, WriteHandler handler)
+  {
+    this->service.async_write_some_at(
+        this->implementation, offset, buffers, handler);
+  }
+
+  /// Read some data from the handle at the specified offset.
+  /**
+   * This function is used to read data from the random-access handle. The
+   * function call will block until one or more bytes of data has been read
+   * successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @returns The number of bytes read.
+   *
+   * @throws boost::system::system_error Thrown on failure. An error code of
+   * boost::asio::error::eof indicates that the connection was closed by the
+   * peer.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read_at function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.read_some_at(42, boost::asio::buffer(data, size));
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(boost::uint64_t offset,
+      const MutableBufferSequence& buffers)
+  {
+    boost::system::error_code ec;
+    std::size_t s = this->service.read_some_at(
+        this->implementation, offset, buffers, ec);
+    boost::asio::detail::throw_error(ec);
+    return s;
+  }
+
+  /// Read some data from the handle at the specified offset.
+  /**
+   * This function is used to read data from the random-access handle. The
+   * function call will block until one or more bytes of data has been read
+   * successfully, or until an error occurs.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @returns The number of bytes read. Returns 0 if an error occurred.
+   *
+   * @note The read_some operation may not read all of the requested number of
+   * bytes. Consider using the @ref read_at function if you need to ensure that
+   * the requested amount of data is read before the blocking operation
+   * completes.
+   */
+  template <typename MutableBufferSequence>
+  std::size_t read_some_at(boost::uint64_t offset,
+      const MutableBufferSequence& buffers, boost::system::error_code& ec)
+  {
+    return this->service.read_some_at(
+        this->implementation, offset, buffers, ec);
+  }
+
+  /// Start an asynchronous read at the specified offset.
+  /**
+   * This function is used to asynchronously read data from the random-access
+   * handle. The function call always returns immediately.
+   *
+   * @param offset The offset at which the data will be read.
+   *
+   * @param buffers One or more buffers into which the data will be read.
+   * Although the buffers object may be copied as necessary, ownership of the
+   * underlying memory blocks is retained by the caller, which must guarantee
+   * that they remain valid until the handler is called.
+   *
+   * @param handler The handler to be called when the read operation completes.
+   * Copies will be made of the handler as required. The function signature of
+   * the handler must be:
+   * @code void handler(
+   *   const boost::system::error_code& error, // Result of operation.
+   *   std::size_t bytes_transferred           // Number of bytes read.
+   * ); @endcode
+   * Regardless of whether the asynchronous operation completes immediately or
+   * not, the handler will not be invoked from within this function. Invocation
+   * of the handler will be performed in a manner equivalent to using
+   * boost::asio::io_service::post().
+   *
+   * @note The read operation may not read all of the requested number of bytes.
+   * Consider using the @ref async_read_at function if you need to ensure that
+   * the requested amount of data is read before the asynchronous operation
+   * completes.
+   *
+   * @par Example
+   * To read into a single data buffer use the @ref buffer function as follows:
+   * @code
+   * handle.async_read_some_at(42, boost::asio::buffer(data, size), handler);
+   * @endcode
+   * See the @ref buffer documentation for information on reading into multiple
+   * buffers in one go, and how to use it with arrays, boost::array or
+   * std::vector.
+   */
+  template <typename MutableBufferSequence, typename ReadHandler>
+  void async_read_some_at(boost::uint64_t offset,
+      const MutableBufferSequence& buffers, ReadHandler handler)
+  {
+    this->service.async_read_some_at(
+        this->implementation, offset, buffers, handler);
+  }
+};
+
+} // namespace windows
+} // namespace asio
+} // namespace boost
+
+#endif // defined(BOOST_ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
+       //   || defined(GENERATING_DOCUMENTATION)
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_WINDOWS_BASIC_RANDOM_ACCESS_HANDLE_HPP