Initial Commit

include/asio/detail/io_object_impl.hpp

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+//
+// detail/io_object_impl.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 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_IO_OBJECT_IMPL_HPP
+#define ASIO_DETAIL_IO_OBJECT_IMPL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <new>
+#include "asio/detail/config.hpp"
+#include "asio/detail/type_traits.hpp"
+#include "asio/execution/executor.hpp"
+#include "asio/execution/context.hpp"
+#include "asio/io_context.hpp"
+#include "asio/query.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+template <typename IoObjectService,
+    typename Executor = io_context::executor_type>
+class io_object_impl
+{
+public:
+  // The type of the service that will be used to provide I/O operations.
+  typedef IoObjectService service_type;
+
+  // The underlying implementation type of I/O object.
+  typedef typename service_type::implementation_type implementation_type;
+
+  // The type of the executor associated with the object.
+  typedef Executor executor_type;
+
+  // Construct an I/O object using an executor.
+  explicit io_object_impl(int, const executor_type& ex)
+    : service_(&asio::use_service<IoObjectService>(
+          io_object_impl::get_context(ex))),
+      executor_(ex)
+  {
+    service_->construct(implementation_);
+  }
+
+  // Construct an I/O object using an execution context.
+  template <typename ExecutionContext>
+  explicit io_object_impl(int, int, ExecutionContext& context)
+    : service_(&asio::use_service<IoObjectService>(context)),
+      executor_(context.get_executor())
+  {
+    service_->construct(implementation_);
+  }
+
+  // Move-construct an I/O object.
+  io_object_impl(io_object_impl&& other)
+    : service_(&other.get_service()),
+      executor_(other.get_executor())
+  {
+    service_->move_construct(implementation_, other.implementation_);
+  }
+
+  // Perform converting move-construction of an I/O object on the same service.
+  template <typename Executor1>
+  io_object_impl(io_object_impl<IoObjectService, Executor1>&& other)
+    : service_(&other.get_service()),
+      executor_(other.get_executor())
+  {
+    service_->move_construct(implementation_, other.get_implementation());
+  }
+
+  // Perform converting move-construction of an I/O object on another service.
+  template <typename IoObjectService1, typename Executor1>
+  io_object_impl(io_object_impl<IoObjectService1, Executor1>&& other)
+    : service_(&asio::use_service<IoObjectService>(
+            io_object_impl::get_context(other.get_executor()))),
+      executor_(other.get_executor())
+  {
+    service_->converting_move_construct(implementation_,
+        other.get_service(), other.get_implementation());
+  }
+
+  // Destructor.
+  ~io_object_impl()
+  {
+    service_->destroy(implementation_);
+  }
+
+  // Move-assign an I/O object.
+  io_object_impl& operator=(io_object_impl&& other)
+  {
+    if (this != &other)
+    {
+      service_->move_assign(implementation_,
+          *other.service_, other.implementation_);
+      executor_.~executor_type();
+      new (&executor_) executor_type(other.executor_);
+      service_ = other.service_;
+    }
+    return *this;
+  }
+
+  // Get the executor associated with the object.
+  const executor_type& get_executor() noexcept
+  {
+    return executor_;
+  }
+
+  // Get the service associated with the I/O object.
+  service_type& get_service()
+  {
+    return *service_;
+  }
+
+  // Get the service associated with the I/O object.
+  const service_type& get_service() const
+  {
+    return *service_;
+  }
+
+  // Get the underlying implementation of the I/O object.
+  implementation_type& get_implementation()
+  {
+    return implementation_;
+  }
+
+  // Get the underlying implementation of the I/O object.
+  const implementation_type& get_implementation() const
+  {
+    return implementation_;
+  }
+
+private:
+  // Helper function to get an executor's context.
+  template <typename T>
+  static execution_context& get_context(const T& t,
+      enable_if_t<execution::is_executor<T>::value>* = 0)
+  {
+    return asio::query(t, execution::context);
+  }
+
+  // Helper function to get an executor's context.
+  template <typename T>
+  static execution_context& get_context(const T& t,
+      enable_if_t<!execution::is_executor<T>::value>* = 0)
+  {
+    return t.context();
+  }
+
+  // Disallow copying and copy assignment.
+  io_object_impl(const io_object_impl&);
+  io_object_impl& operator=(const io_object_impl&);
+
+  // The service associated with the I/O object.
+  service_type* service_;
+
+  // The underlying implementation of the I/O object.
+  implementation_type implementation_;
+
+  // The associated executor.
+  executor_type executor_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_DETAIL_IO_OBJECT_IMPL_HPP