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Current File : //usr/include/asio/windows/overlapped_handle.hpp
//
// windows/overlapped_handle.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_WINDOWS_OVERLAPPED_HANDLE_HPP
#define ASIO_WINDOWS_OVERLAPPED_HANDLE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if !defined(ASIO_ENABLE_OLD_SERVICES)
#if defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
|| defined(ASIO_HAS_WINDOWS_STREAM_HANDLE) \
|| defined(GENERATING_DOCUMENTATION)
#include <cstddef>
#include "asio/async_result.hpp"
#include "asio/basic_io_object.hpp"
#include "asio/detail/throw_error.hpp"
#include "asio/detail/win_iocp_handle_service.hpp"
#include "asio/error.hpp"
#include "asio/io_context.hpp"
#if defined(ASIO_HAS_MOVE)
# include <utility>
#endif // defined(ASIO_HAS_MOVE)
#define ASIO_SVC_T asio::detail::win_iocp_handle_service
#include "asio/detail/push_options.hpp"
namespace asio {
namespace windows {
/// Provides Windows handle functionality for objects that support
/// overlapped I/O.
/**
* The windows::overlapped_handle class provides the ability to wrap a Windows
* handle. The underlying object referred to by the handle must support
* overlapped I/O.
*
* @par Thread Safety
* @e Distinct @e objects: Safe.@n
* @e Shared @e objects: Unsafe.
*/
class overlapped_handle
: ASIO_SVC_ACCESS basic_io_object<ASIO_SVC_T>
{
public:
/// The type of the executor associated with the object.
typedef io_context::executor_type executor_type;
/// The native representation of a handle.
#if defined(GENERATING_DOCUMENTATION)
typedef implementation_defined native_handle_type;
#else
typedef ASIO_SVC_T::native_handle_type native_handle_type;
#endif
/// An overlapped_handle is always the lowest layer.
typedef overlapped_handle lowest_layer_type;
/// Construct an overlapped_handle without opening it.
/**
* This constructor creates a handle without opening it.
*
* @param io_context The io_context object that the handle will use to
* dispatch handlers for any asynchronous operations performed on the handle.
*/
explicit overlapped_handle(asio::io_context& io_context)
: basic_io_object<ASIO_SVC_T>(io_context)
{
}
/// Construct an overlapped_handle on an existing native handle.
/**
* This constructor creates a handle object to hold an existing native handle.
*
* @param io_context The io_context object that the handle will use to
* dispatch handlers for any asynchronous operations performed on the handle.
*
* @param handle A native handle.
*
* @throws asio::system_error Thrown on failure.
*/
overlapped_handle(asio::io_context& io_context,
const native_handle_type& handle)
: basic_io_object<ASIO_SVC_T>(io_context)
{
asio::error_code ec;
this->get_service().assign(this->get_implementation(), handle, ec);
asio::detail::throw_error(ec, "assign");
}
#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
/// Move-construct an overlapped_handle from another.
/**
* This constructor moves a handle from one object to another.
*
* @param other The other overlapped_handle object from which the move will
* occur.
*
* @note Following the move, the moved-from object is in the same state as if
* constructed using the @c overlapped_handle(io_context&) constructor.
*/
overlapped_handle(overlapped_handle&& other)
: basic_io_object<ASIO_SVC_T>(std::move(other))
{
}
/// Move-assign an overlapped_handle from another.
/**
* This assignment operator moves a handle from one object to another.
*
* @param other The other overlapped_handle object from which the move will
* occur.
*
* @note Following the move, the moved-from object is in the same state as if
* constructed using the @c overlapped_handle(io_context&) constructor.
*/
overlapped_handle& operator=(overlapped_handle&& other)
{
basic_io_object<ASIO_SVC_T>::operator=(std::move(other));
return *this;
}
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
#if !defined(ASIO_NO_DEPRECATED)
/// (Deprecated: Use get_executor().) Get the io_context associated with the
/// object.
/**
* This function may be used to obtain the io_context object that the I/O
* object uses to dispatch handlers for asynchronous operations.
*
* @return A reference to the io_context object that the I/O object will use
* to dispatch handlers. Ownership is not transferred to the caller.
*/
asio::io_context& get_io_context()
{
return basic_io_object<ASIO_SVC_T>::get_io_context();
}
/// (Deprecated: Use get_executor().) Get the io_context associated with the
/// object.
/**
* This function may be used to obtain the io_context object that the I/O
* object uses to dispatch handlers for asynchronous operations.
*
* @return A reference to the io_context object that the I/O object will use
* to dispatch handlers. Ownership is not transferred to the caller.
*/
asio::io_context& get_io_service()
{
return basic_io_object<ASIO_SVC_T>::get_io_service();
}
#endif // !defined(ASIO_NO_DEPRECATED)
/// Get the executor associated with the object.
executor_type get_executor() ASIO_NOEXCEPT
{
return basic_io_object<ASIO_SVC_T>::get_executor();
}
/// Get a reference to the lowest layer.
/**
* This function returns a reference to the lowest layer in a stack of
* layers. Since an overlapped_handle cannot contain any further layers, it
* simply returns a reference to itself.
*
* @return A reference to the lowest layer in the stack of layers. Ownership
* is not transferred to the caller.
*/
lowest_layer_type& lowest_layer()
{
return *this;
}
/// Get a const reference to the lowest layer.
/**
* This function returns a const reference to the lowest layer in a stack of
* layers. Since an overlapped_handle cannot contain any further layers, it
* simply returns a reference to itself.
*
* @return A const reference to the lowest layer in the stack of layers.
* Ownership is not transferred to the caller.
*/
const lowest_layer_type& lowest_layer() const
{
return *this;
}
/// Assign an existing native handle to the handle.
/*
* This function opens the handle to hold an existing native handle.
*
* @param handle A native handle.
*
* @throws asio::system_error Thrown on failure.
*/
void assign(const native_handle_type& handle)
{
asio::error_code ec;
this->get_service().assign(this->get_implementation(), handle, ec);
asio::detail::throw_error(ec, "assign");
}
/// Assign an existing native handle to the handle.
/*
* This function opens the handle to hold an existing native handle.
*
* @param handle A native handle.
*
* @param ec Set to indicate what error occurred, if any.
*/
ASIO_SYNC_OP_VOID assign(const native_handle_type& handle,
asio::error_code& ec)
{
this->get_service().assign(this->get_implementation(), handle, ec);
ASIO_SYNC_OP_VOID_RETURN(ec);
}
/// Determine whether the handle is open.
bool is_open() const
{
return this->get_service().is_open(this->get_implementation());
}
/// Close the handle.
/**
* This function is used to close the handle. Any asynchronous read or write
* operations will be cancelled immediately, and will complete with the
* asio::error::operation_aborted error.
*
* @throws asio::system_error Thrown on failure.
*/
void close()
{
asio::error_code ec;
this->get_service().close(this->get_implementation(), ec);
asio::detail::throw_error(ec, "close");
}
/// Close the handle.
/**
* This function is used to close the handle. Any asynchronous read or write
* operations will be cancelled immediately, and will complete with the
* asio::error::operation_aborted error.
*
* @param ec Set to indicate what error occurred, if any.
*/
ASIO_SYNC_OP_VOID close(asio::error_code& ec)
{
this->get_service().close(this->get_implementation(), ec);
ASIO_SYNC_OP_VOID_RETURN(ec);
}
/// Get the native handle representation.
/**
* This function may be used to obtain the underlying representation of the
* handle. This is intended to allow access to native handle functionality
* that is not otherwise provided.
*/
native_handle_type native_handle()
{
return this->get_service().native_handle(this->get_implementation());
}
/// Cancel all asynchronous operations associated with the handle.
/**
* This function causes all outstanding asynchronous read or write operations
* to finish immediately, and the handlers for cancelled operations will be
* passed the asio::error::operation_aborted error.
*
* @throws asio::system_error Thrown on failure.
*/
void cancel()
{
asio::error_code ec;
this->get_service().cancel(this->get_implementation(), ec);
asio::detail::throw_error(ec, "cancel");
}
/// Cancel all asynchronous operations associated with the handle.
/**
* This function causes all outstanding asynchronous read or write operations
* to finish immediately, and the handlers for cancelled operations will be
* passed the asio::error::operation_aborted error.
*
* @param ec Set to indicate what error occurred, if any.
*/
ASIO_SYNC_OP_VOID cancel(asio::error_code& ec)
{
this->get_service().cancel(this->get_implementation(), ec);
ASIO_SYNC_OP_VOID_RETURN(ec);
}
protected:
/// Protected destructor to prevent deletion through this type.
/**
* This function destroys the handle, cancelling any outstanding asynchronous
* wait operations associated with the handle as if by calling @c cancel.
*/
~overlapped_handle()
{
}
};
} // namespace windows
} // namespace asio
#include "asio/detail/pop_options.hpp"
#undef ASIO_SVC_T
#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
// || defined(ASIO_HAS_WINDOWS_STREAM_HANDLE)
// || defined(GENERATING_DOCUMENTATION)
#endif // !defined(ASIO_ENABLE_OLD_SERVICES)
#endif // ASIO_WINDOWS_OVERLAPPED_HANDLE_HPP
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