Initial Commit

include/asio/detached.hpp

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+//
+// detached.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_DETACHED_HPP
+#define ASIO_DETACHED_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <memory>
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// A @ref completion_token type used to specify that an asynchronous operation
+/// is detached.
+/**
+ * The detached_t class is used to indicate that an asynchronous operation is
+ * detached. That is, there is no completion handler waiting for the
+ * operation's result. A detached_t object may be passed as a handler to an
+ * asynchronous operation, typically using the special value
+ * @c asio::detached. For example:
+ *
+ * @code my_socket.async_send(my_buffer, asio::detached);
+ * @endcode
+ */
+class detached_t
+{
+public:
+  /// Constructor.
+  constexpr detached_t()
+  {
+  }
+
+  /// Adapts an executor to add the @c detached_t completion token as the
+  /// default.
+  template <typename InnerExecutor>
+  struct executor_with_default : InnerExecutor
+  {
+    /// Specify @c detached_t as the default completion token type.
+    typedef detached_t default_completion_token_type;
+
+    /// Construct the adapted executor from the inner executor type.
+    executor_with_default(const InnerExecutor& ex) noexcept
+      : InnerExecutor(ex)
+    {
+    }
+
+    /// Convert the specified executor to the inner executor type, then use
+    /// that to construct the adapted executor.
+    template <typename OtherExecutor>
+    executor_with_default(const OtherExecutor& ex,
+        constraint_t<
+          is_convertible<OtherExecutor, InnerExecutor>::value
+        > = 0) noexcept
+      : InnerExecutor(ex)
+    {
+    }
+  };
+
+  /// Type alias to adapt an I/O object to use @c detached_t as its
+  /// default completion token type.
+  template <typename T>
+  using as_default_on_t = typename T::template rebind_executor<
+      executor_with_default<typename T::executor_type>>::other;
+
+  /// Function helper to adapt an I/O object to use @c detached_t as its
+  /// default completion token type.
+  template <typename T>
+  static typename decay_t<T>::template rebind_executor<
+      executor_with_default<typename decay_t<T>::executor_type>
+    >::other
+  as_default_on(T&& object)
+  {
+    return typename decay_t<T>::template rebind_executor<
+        executor_with_default<typename decay_t<T>::executor_type>
+      >::other(static_cast<T&&>(object));
+  }
+};
+
+/// A @ref completion_token object used to specify that an asynchronous
+/// operation is detached.
+/**
+ * See the documentation for asio::detached_t for a usage example.
+ */
+ASIO_INLINE_VARIABLE constexpr detached_t detached;
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/detached.hpp"
+
+#endif // ASIO_DETACHED_HPP