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+//
+// detail/win_iocp_socket_recvfrom_op.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP
+#define ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_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_HAS_IOCP)
+
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_alloc_helpers.hpp"
+#include "asio/detail/handler_invoke_helpers.hpp"
+#include "asio/detail/handler_work.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/operation.hpp"
+#include "asio/detail/socket_ops.hpp"
+#include "asio/error.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename MutableBufferSequence, typename Endpoint,
+ typename Handler, typename IoExecutor>
+class win_iocp_socket_recvfrom_op : public operation
+{
+public:
+ ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvfrom_op);
+
+ win_iocp_socket_recvfrom_op(Endpoint& endpoint,
+ socket_ops::weak_cancel_token_type cancel_token,
+ const MutableBufferSequence& buffers, Handler& handler,
+ const IoExecutor& io_ex)
+ : operation(&win_iocp_socket_recvfrom_op::do_complete),
+ endpoint_(endpoint),
+ endpoint_size_(static_cast<int>(endpoint.capacity())),
+ cancel_token_(cancel_token),
+ buffers_(buffers),
+ handler_(ASIO_MOVE_CAST(Handler)(handler)),
+ work_(handler_, io_ex)
+ {
+ }
+
+ int& endpoint_size()
+ {
+ return endpoint_size_;
+ }
+
+ static void do_complete(void* owner, operation* base,
+ const asio::error_code& result_ec,
+ std::size_t bytes_transferred)
+ {
+ asio::error_code ec(result_ec);
+
+ // Take ownership of the operation object.
+ win_iocp_socket_recvfrom_op* o(
+ static_cast<win_iocp_socket_recvfrom_op*>(base));
+ ptr p = { asio::detail::addressof(o->handler_), o, o };
+
+ ASIO_HANDLER_COMPLETION((*o));
+
+ // Take ownership of the operation's outstanding work.
+ handler_work<Handler, IoExecutor> w(
+ ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
+ o->work_));
+
+#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+ // Check whether buffers are still valid.
+ if (owner)
+ {
+ buffer_sequence_adapter<asio::mutable_buffer,
+ MutableBufferSequence>::validate(o->buffers_);
+ }
+#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
+
+ socket_ops::complete_iocp_recvfrom(o->cancel_token_, ec);
+
+ // Record the size of the endpoint returned by the operation.
+ o->endpoint_.resize(o->endpoint_size_);
+
+ // Make a copy of the handler so that the memory can be deallocated before
+ // the upcall is made. Even if we're not about to make an upcall, a
+ // sub-object of the handler may be the true owner of the memory associated
+ // with the handler. Consequently, a local copy of the handler is required
+ // to ensure that any owning sub-object remains valid until after we have
+ // deallocated the memory here.
+ detail::binder2<Handler, asio::error_code, std::size_t>
+ handler(o->handler_, ec, bytes_transferred);
+ p.h = asio::detail::addressof(handler.handler_);
+ p.reset();
+
+ // Make the upcall if required.
+ if (owner)
+ {
+ fenced_block b(fenced_block::half);
+ ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
+ w.complete(handler, handler.handler_);
+ ASIO_HANDLER_INVOCATION_END;
+ }
+ }
+
+private:
+ Endpoint& endpoint_;
+ int endpoint_size_;
+ socket_ops::weak_cancel_token_type cancel_token_;
+ MutableBufferSequence buffers_;
+ Handler handler_;
+ handler_work<Handler, IoExecutor> work_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_HAS_IOCP)
+
+#endif // ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP