update boost

linx64/include/boost/asio/windows/basic_object_handle.hpp

@@ -2,7 +2,7 @@
 // windows/basic_object_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 // Copyright (c) 2011 Boris Schaeling (boris@highscore.de)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -21,13 +21,13 @@
 #if defined(BOOST_ASIO_HAS_WINDOWS_OBJECT_HANDLE) \
   || defined(GENERATING_DOCUMENTATION)
 
+#include <boost/asio/any_io_executor.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/detail/io_object_impl.hpp>
 #include <boost/asio/detail/throw_error.hpp>
 #include <boost/asio/detail/win_object_handle_service.hpp>
 #include <boost/asio/error.hpp>
 #include <boost/asio/execution_context.hpp>
-#include <boost/asio/executor.hpp>
 
 #if defined(BOOST_ASIO_HAS_MOVE)
 # include <utility>
@@ -48,13 +48,24 @@ namespace windows {
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
-template <typename Executor = executor>
+template <typename Executor = any_io_executor>
 class basic_object_handle
 {
+private:
+  class initiate_async_wait;
+
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
+  /// Rebinds the handle type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The handle type when rebound to the specified executor.
+    typedef basic_object_handle<Executor1> other;
+  };
+
   /// The native representation of a handle.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
@@ -75,7 +86,7 @@ public:
    * object handle.
    */
   explicit basic_object_handle(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -89,11 +100,11 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_object_handle(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value,
-        basic_object_handle
-      >::type* = 0)
-    : impl_(context)
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
   }
 
@@ -112,7 +123,7 @@ public:
    */
   basic_object_handle(const executor_type& ex,
       const native_handle_type& native_handle)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(), native_handle, ec);
@@ -135,10 +146,10 @@ public:
   template <typename ExecutionContext>
   basic_object_handle(ExecutionContext& context,
       const native_handle_type& native_handle,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
-    : impl_(context)
+      >::type = 0)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(), native_handle, ec);
@@ -178,10 +189,56 @@ public:
     impl_ = std::move(other.impl_);
     return *this;
   }
+
+  // All handles have access to each other's implementations.
+  template <typename Executor1>
+  friend class basic_object_handle;
+
+  /// Move-construct an object handle from a handle of another executor type.
+  /**
+   * This constructor moves an object handle from one object to another.
+   *
+   * @param other The other object 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 basic_object_handle(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  basic_object_handle(basic_object_handle<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(std::move(other.impl_))
+  {
+  }
+
+  /// Move-assign an object handle from a handle of another executor type.
+  /**
+   * This assignment operator moves an object handle from one object to another.
+   *
+   * @param other The other object 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 basic_object_handle(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_object_handle&
+  >::type operator=(basic_object_handle<Executor1>&& other)
+  {
+    impl_ = std::move(other.impl_);
+    return *this;
+  }
 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 
   /// Get the executor associated with the object.
-  executor_type get_executor() BOOST_ASIO_NOEXCEPT
+  const executor_type& get_executor() BOOST_ASIO_NOEXCEPT
   {
     return impl_.get_executor();
   }
@@ -350,31 +407,39 @@ public:
   /// Start an asynchronous wait on the object handle.
   /**
    * This function is be used to initiate an asynchronous wait against the
-   * object handle. It always returns immediately.
+   * object handle. It is an initiating function for an @ref
+   * asynchronous_operation, and always returns immediately.
    *
-   * @param handler The handler to be called when the object handle is set to
-   * the signalled state. Copies will be made of the handler as required. The
-   * function signature of the handler must be:
+   * @param token The @ref completion_token that will be used to produce a
+   * completion handler, which will be called when the wait completes.
+   * Potential completion tokens include @ref use_future, @ref use_awaitable,
+   * @ref yield_context, or a function object with the correct completion
+   * signature. The function signature of the completion handler must be:
    * @code void handler(
    *   const boost::system::error_code& error // Result of operation.
    * ); @endcode
    * Regardless of whether the asynchronous operation completes immediately or
-   * not, the handler will not be invoked from within this function. On
-   * immediate completion, invocation of the handler will be performed in a
+   * not, the completion handler will not be invoked from within this function.
+   * On immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
+   *
+   * @par Completion Signature
+   * @code void(boost::system::error_code) @endcode
    */
-  template <typename WaitHandler>
-  BOOST_ASIO_INITFN_RESULT_TYPE(WaitHandler,
+  template <
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code))
+        WaitToken BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(WaitToken,
       void (boost::system::error_code))
-  async_wait(BOOST_ASIO_MOVE_ARG(WaitHandler) handler)
+  async_wait(
+      BOOST_ASIO_MOVE_ARG(WaitToken) token
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
+      async_initiate<WaitToken, void (boost::system::error_code)>(
+          declval<initiate_async_wait>(), token)))
   {
-    boost::asio::async_completion<WaitHandler,
-      void (boost::system::error_code)> init(handler);
-
-    impl_.get_service().async_wait(impl_.get_implementation(),
-        init.completion_handler, impl_.get_implementation_executor());
-
-    return init.result.get();
+    return async_initiate<WaitToken, void (boost::system::error_code)>(
+        initiate_async_wait(this), token);
   }
 
 private:
@@ -382,6 +447,38 @@ private:
   basic_object_handle(const basic_object_handle&) BOOST_ASIO_DELETED;
   basic_object_handle& operator=(const basic_object_handle&) BOOST_ASIO_DELETED;
 
+  class initiate_async_wait
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_wait(basic_object_handle* self)
+      : self_(self)
+    {
+    }
+
+    const executor_type& get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename WaitHandler>
+    void operator()(BOOST_ASIO_MOVE_ARG(WaitHandler) handler) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a WaitHandler.
+      BOOST_ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check;
+
+      detail::non_const_lvalue<WaitHandler> handler2(handler);
+      self_->impl_.get_service().async_wait(
+          self_->impl_.get_implementation(),
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_object_handle* self_;
+  };
+
   boost::asio::detail::io_object_impl<
     boost::asio::detail::win_object_handle_service, Executor> impl_;
 };

linx64/include/boost/asio/windows/basic_overlapped_handle.hpp

@@ -2,7 +2,7 @@
 // windows/basic_overlapped_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)
@@ -22,13 +22,13 @@
   || defined(GENERATING_DOCUMENTATION)
 
 #include <cstddef>
+#include <boost/asio/any_io_executor.hpp>
 #include <boost/asio/async_result.hpp>
 #include <boost/asio/detail/io_object_impl.hpp>
 #include <boost/asio/detail/throw_error.hpp>
 #include <boost/asio/detail/win_iocp_handle_service.hpp>
 #include <boost/asio/error.hpp>
 #include <boost/asio/execution_context.hpp>
-#include <boost/asio/executor.hpp>
 
 #if defined(BOOST_ASIO_HAS_MOVE)
 # include <utility>
@@ -51,13 +51,21 @@ namespace windows {
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
-template <typename Executor = executor>
+template <typename Executor = any_io_executor>
 class basic_overlapped_handle
 {
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
+  /// Rebinds the handle type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The handle type when rebound to the specified executor.
+    typedef basic_overlapped_handle<Executor1> other;
+  };
+
   /// The native representation of a handle.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
@@ -78,7 +86,7 @@ public:
    * overlapped handle.
    */
   explicit basic_overlapped_handle(const executor_type& ex)
-    : impl_(ex)
+    : impl_(0, ex)
   {
   }
 
@@ -92,11 +100,11 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_overlapped_handle(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value,
-        basic_overlapped_handle
-      >::type* = 0)
-    : impl_(context)
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(0, 0, context)
   {
   }
 
@@ -115,7 +123,7 @@ public:
    */
   basic_overlapped_handle(const executor_type& ex,
       const native_handle_type& native_handle)
-    : impl_(ex)
+    : impl_(0, ex)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(), native_handle, ec);
@@ -138,10 +146,10 @@ public:
   template <typename ExecutionContext>
   basic_overlapped_handle(ExecutionContext& context,
       const native_handle_type& native_handle,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
-    : impl_(context)
+      >::type = 0)
+    : impl_(0, 0, context)
   {
     boost::system::error_code ec;
     impl_.get_service().assign(impl_.get_implementation(), native_handle, ec);
@@ -181,10 +189,57 @@ public:
     impl_ = std::move(other.impl_);
     return *this;
   }
+
+  // All overlapped handles have access to each other's implementations.
+  template <typename Executor1>
+  friend class basic_overlapped_handle;
+
+  /// Move-construct an overlapped handle from a handle of another executor
+  /// type.
+  /**
+   * 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(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  basic_overlapped_handle(basic_overlapped_handle<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : impl_(std::move(other.impl_))
+  {
+  }
+
+  /// Move-assign an overlapped handle from a handle of another executor type.
+  /**
+   * 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(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_overlapped_handle&
+  >::type operator=(basic_overlapped_handle<Executor1>&& other)
+  {
+    impl_ = std::move(other.impl_);
+    return *this;
+  }
 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 
   /// Get the executor associated with the object.
-  executor_type get_executor() BOOST_ASIO_NOEXCEPT
+  const executor_type& get_executor() BOOST_ASIO_NOEXCEPT
   {
     return impl_.get_executor();
   }
@@ -282,6 +337,58 @@ public:
     BOOST_ASIO_SYNC_OP_VOID_RETURN(ec);
   }
 
+  /// Release ownership of the underlying native handle.
+  /**
+   * This function causes all outstanding asynchronous operations to finish
+   * immediately, and the handlers for cancelled operations will be passed the
+   * boost::asio::error::operation_aborted error. Ownership of the native handle
+   * is then transferred to the caller.
+   *
+   * @throws boost::system::system_error Thrown on failure.
+   *
+   * @note This function is unsupported on Windows versions prior to Windows
+   * 8.1, and will fail with boost::asio::error::operation_not_supported on
+   * these platforms.
+   */
+#if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
+  __declspec(deprecated("This function always fails with "
+        "operation_not_supported when used on Windows versions "
+        "prior to Windows 8.1."))
+#endif
+  native_handle_type release()
+  {
+    boost::system::error_code ec;
+    native_handle_type s = impl_.get_service().release(
+        impl_.get_implementation(), ec);
+    boost::asio::detail::throw_error(ec, "release");
+    return s;
+  }
+
+  /// Release ownership of the underlying native handle.
+  /**
+   * This function causes all outstanding asynchronous operations to finish
+   * immediately, and the handlers for cancelled operations will be passed the
+   * boost::asio::error::operation_aborted error. Ownership of the native handle
+   * is then transferred to the caller.
+   *
+   * @param ec Set to indicate what error occurred, if any.
+   *
+   * @note This function is unsupported on Windows versions prior to Windows
+   * 8.1, and will fail with boost::asio::error::operation_not_supported on
+   * these platforms.
+   */
+#if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \
+  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
+  __declspec(deprecated("This function always fails with "
+        "operation_not_supported when used on Windows versions "
+        "prior to Windows 8.1."))
+#endif
+  native_handle_type release(boost::system::error_code& ec)
+  {
+    return impl_.get_service().release(impl_.get_implementation(), ec);
+  }
+
   /// Get the native handle representation.
   /**
    * This function may be used to obtain the underlying representation of the

linx64/include/boost/asio/windows/basic_random_access_handle.hpp

@@ -2,7 +2,7 @@
 // windows/basic_random_access_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)
@@ -36,14 +36,26 @@ namespace windows {
  * @e Distinct @e objects: Safe.@n
  * @e Shared @e objects: Unsafe.
  */
-template <typename Executor = executor>
+template <typename Executor = any_io_executor>
 class basic_random_access_handle
   : public basic_overlapped_handle<Executor>
 {
+private:
+  class initiate_async_write_some_at;
+  class initiate_async_read_some_at;
+
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
+  /// Rebinds the handle type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The handle type when rebound to the specified executor.
+    typedef basic_random_access_handle<Executor1> other;
+  };
+
   /// The native representation of a handle.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
@@ -68,8 +80,8 @@ public:
   /// Construct a random-access handle without opening it.
   /**
    * This constructor creates a random-access handle without opening it. The
-   * handle needs to be opened or assigned before data can be sent or received
-   * on it.
+   * handle needs to be opened or assigned before data can be written to or read
+   * from it.
    *
    * @param context An execution context which provides the I/O executor that
    * the random-access handle will use, by default, to dispatch handlers for any
@@ -77,10 +89,10 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_random_access_handle(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value,
-        basic_random_access_handle
-      >::type* = 0)
+        defaulted_constraint
+      >::type = defaulted_constraint())
     : basic_overlapped_handle<Executor>(context)
   {
   }
@@ -120,9 +132,9 @@ public:
   template <typename ExecutionContext>
   basic_random_access_handle(ExecutionContext& context,
       const native_handle_type& handle,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_overlapped_handle<Executor>(context, handle)
   {
   }
@@ -161,6 +173,51 @@ public:
     basic_overlapped_handle<Executor>::operator=(std::move(other));
     return *this;
   }
+
+  /// Move-construct a random-access handle from a handle of another executor
+  /// type.
+  /**
+   * This constructor moves a random-access handle from one object to another.
+   *
+   * @param other The other random-access 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 basic_random_access_handle(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  basic_random_access_handle(basic_random_access_handle<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_overlapped_handle<Executor>(std::move(other))
+  {
+  }
+
+  /// Move-assign a random-access handle from a handle of another executor
+  /// type.
+  /**
+   * This assignment operator moves a random-access handle from one object to
+   * another.
+   *
+   * @param other The other random-access 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 basic_random_access_handle(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_random_access_handle&
+  >::type operator=(basic_random_access_handle<Executor1>&& other)
+  {
+    basic_overlapped_handle<Executor>::operator=(std::move(other));
+    return *this;
+  }
 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 
   /// Write some data to the handle at the specified offset.
@@ -232,27 +289,33 @@ public:
   /// 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.
+   * handle. It is an initiating function for an @ref asynchronous_operation,
+   * and 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.
+   * that they remain valid until the completion 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:
+   * @param token The @ref completion_token that will be used to produce a
+   * completion handler, which will be called when the write completes.
+   * Potential completion tokens include @ref use_future, @ref use_awaitable,
+   * @ref yield_context, or a function object with the correct completion
+   * signature. The function signature of the completion handler must be:
    * @code void handler(
    *   const boost::system::error_code& error, // Result of operation.
-   *   std::size_t bytes_transferred           // Number of bytes written.
+   *   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. On
-   * immediate completion, invocation of the handler will be performed in a
+   * not, the completion handler will not be invoked from within this function.
+   * On immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
    *
+   * @par Completion Signature
+   * @code void(boost::system::error_code, std::size_t) @endcode
+   *
    * @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.
@@ -265,27 +328,35 @@ public:
    * 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.
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
-  template <typename ConstBufferSequence, typename WriteHandler>
-  BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,
+  template <typename ConstBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) WriteToken
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(WriteToken,
       void (boost::system::error_code, std::size_t))
   async_write_some_at(uint64_t offset,
       const ConstBufferSequence& buffers,
-      BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
+      BOOST_ASIO_MOVE_ARG(WriteToken) token
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
+      async_initiate<WriteToken,
+        void (boost::system::error_code, std::size_t)>(
+          declval<initiate_async_write_some_at>(), token, offset, buffers)))
   {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a WriteHandler.
-    BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
-
-    boost::asio::async_completion<WriteHandler,
-      void (boost::system::error_code, std::size_t)> init(handler);
-
-    this->impl_.get_service().async_write_some_at(
-        this->impl_.get_implementation(), offset,
-        buffers, init.completion_handler,
-        this->impl_.get_implementation_executor());
-
-    return init.result.get();
+    return async_initiate<WriteToken,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_write_some_at(this), token, offset, buffers);
   }
 
   /// Read some data from the handle at the specified offset.
@@ -359,27 +430,33 @@ public:
   /// 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.
+   * handle. It is an initiating function for an @ref asynchronous_operation,
+   * and 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.
+   * that they remain valid until the completion 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:
+   * @param token The @ref completion_token that will be used to produce a
+   * completion handler, which will be called when the read completes.
+   * Potential completion tokens include @ref use_future, @ref use_awaitable,
+   * @ref yield_context, or a function object with the correct completion
+   * signature. The function signature of the completion handler must be:
    * @code void handler(
    *   const boost::system::error_code& error, // Result of operation.
-   *   std::size_t bytes_transferred           // Number of bytes read.
+   *   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. On
-   * immediate completion, invocation of the handler will be performed in a
+   * not, the completion handler will not be invoked from within this function.
+   * On immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
    *
+   * @par Completion Signature
+   * @code void(boost::system::error_code, std::size_t) @endcode
+   *
    * @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
@@ -393,28 +470,103 @@ public:
    * 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.
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
-  template <typename MutableBufferSequence, typename ReadHandler>
-  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,
+  template <typename MutableBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) ReadToken
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
       void (boost::system::error_code, std::size_t))
   async_read_some_at(uint64_t offset,
       const MutableBufferSequence& buffers,
-      BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
+      BOOST_ASIO_MOVE_ARG(ReadToken) token
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
+      async_initiate<ReadToken,
+        void (boost::system::error_code, std::size_t)>(
+          declval<initiate_async_read_some_at>(), token, offset, buffers)))
   {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a ReadHandler.
-    BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
-
-    boost::asio::async_completion<ReadHandler,
-      void (boost::system::error_code, std::size_t)> init(handler);
-
-    this->impl_.get_service().async_read_some_at(
-        this->impl_.get_implementation(), offset,
-        buffers, init.completion_handler,
-        this->impl_.get_implementation_executor());
-
-    return init.result.get();
+    return async_initiate<ReadToken,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_read_some_at(this), token, offset, buffers);
   }
+
+private:
+  class initiate_async_write_some_at
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_write_some_at(basic_random_access_handle* self)
+      : self_(self)
+    {
+    }
+
+    const executor_type& get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename WriteHandler, typename ConstBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(WriteHandler) handler,
+        uint64_t offset, const ConstBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a WriteHandler.
+      BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
+
+      detail::non_const_lvalue<WriteHandler> handler2(handler);
+      self_->impl_.get_service().async_write_some_at(
+          self_->impl_.get_implementation(), offset, buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_random_access_handle* self_;
+  };
+
+  class initiate_async_read_some_at
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_read_some_at(basic_random_access_handle* self)
+      : self_(self)
+    {
+    }
+
+    const executor_type& get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename ReadHandler, typename MutableBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler,
+        uint64_t offset, const MutableBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a ReadHandler.
+      BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+      detail::non_const_lvalue<ReadHandler> handler2(handler);
+      self_->impl_.get_service().async_read_some_at(
+          self_->impl_.get_implementation(), offset, buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_random_access_handle* self_;
+  };
 };
 
 } // namespace windows

linx64/include/boost/asio/windows/basic_stream_handle.hpp

@@ -2,7 +2,7 @@
 // windows/basic_stream_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)
@@ -39,14 +39,26 @@ namespace windows {
  * @par Concepts:
  * AsyncReadStream, AsyncWriteStream, Stream, SyncReadStream, SyncWriteStream.
  */
-template <typename Executor = executor>
+template <typename Executor = any_io_executor>
 class basic_stream_handle
   : public basic_overlapped_handle<Executor>
 {
+private:
+  class initiate_async_write_some;
+  class initiate_async_read_some;
+
 public:
   /// The type of the executor associated with the object.
   typedef Executor executor_type;
 
+  /// Rebinds the handle type to another executor.
+  template <typename Executor1>
+  struct rebind_executor
+  {
+    /// The handle type when rebound to the specified executor.
+    typedef basic_stream_handle<Executor1> other;
+  };
+
   /// The native representation of a handle.
 #if defined(GENERATING_DOCUMENTATION)
   typedef implementation_defined native_handle_type;
@@ -71,7 +83,8 @@ public:
   /// Construct a stream handle without opening it.
   /**
    * This constructor creates a stream handle without opening it. The handle
-   * needs to be opened or assigned before data can be sent or received on it.
+   * needs to be opened or assigned before data can be written to or read from
+   * it.
    *
    * @param context An execution context which provides the I/O executor that
    * the stream handle will use, by default, to dispatch handlers for any
@@ -79,10 +92,10 @@ public:
    */
   template <typename ExecutionContext>
   explicit basic_stream_handle(ExecutionContext& context,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value,
-        basic_stream_handle
-      >::type* = 0)
+        defaulted_constraint
+      >::type = defaulted_constraint())
     : basic_overlapped_handle<Executor>(context)
   {
   }
@@ -121,9 +134,9 @@ public:
   template <typename ExecutionContext>
   basic_stream_handle(ExecutionContext& context,
       const native_handle_type& handle,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : basic_overlapped_handle<Executor>(context, handle)
   {
   }
@@ -161,6 +174,48 @@ public:
     basic_overlapped_handle<Executor>::operator=(std::move(other));
     return *this;
   }
+
+  /// Move-construct a stream handle from a handle of another executor type.
+  /**
+   * This constructor moves a stream handle from one object to another.
+   *
+   * @param other The other stream 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 basic_stream_handle(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  basic_stream_handle(basic_stream_handle<Executor1>&& other,
+      typename constraint<
+        is_convertible<Executor1, Executor>::value,
+        defaulted_constraint
+      >::type = defaulted_constraint())
+    : basic_overlapped_handle<Executor>(std::move(other))
+  {
+  }
+
+  /// Move-assign a stream handle from a handle of another executor type.
+  /**
+   * This assignment operator moves a stream handle from one object to
+   * another.
+   *
+   * @param other The other stream 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 basic_stream_handle(const executor_type&)
+   * constructor.
+   */
+  template<typename Executor1>
+  typename constraint<
+    is_convertible<Executor1, Executor>::value,
+    basic_stream_handle&
+  >::type operator=(basic_stream_handle<Executor1>&& other)
+  {
+    basic_overlapped_handle<Executor>::operator=(std::move(other));
+    return *this;
+  }
 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 
   /// Write some data to the handle.
@@ -227,25 +282,31 @@ public:
   /// Start an asynchronous write.
   /**
    * This function is used to asynchronously write data to the stream handle.
-   * The function call always returns immediately.
+   * It is an initiating function for an @ref asynchronous_operation, and always
+   * returns immediately.
    *
    * @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.
+   * that they remain valid until the completion 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:
+   * @param token The @ref completion_token that will be used to produce a
+   * completion handler, which will be called when the write completes.
+   * Potential completion tokens include @ref use_future, @ref use_awaitable,
+   * @ref yield_context, or a function object with the correct completion
+   * signature. The function signature of the completion handler must be:
    * @code void handler(
    *   const boost::system::error_code& error, // Result of operation.
-   *   std::size_t bytes_transferred           // Number of bytes written.
+   *   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. On
-   * immediate completion, invocation of the handler will be performed in a
+   * not, the completion handler will not be invoked from within this function.
+   * On immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
    *
+   * @par Completion Signature
+   * @code void(boost::system::error_code, std::size_t) @endcode
+   *
    * @note The write operation may not transmit all of the data to the peer.
    * Consider using the @ref async_write function if you need to ensure that all
    * data is written before the asynchronous operation completes.
@@ -258,26 +319,34 @@ public:
    * 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.
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
-  template <typename ConstBufferSequence, typename WriteHandler>
-  BOOST_ASIO_INITFN_RESULT_TYPE(WriteHandler,
+  template <typename ConstBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) WriteToken
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(WriteToken,
       void (boost::system::error_code, std::size_t))
   async_write_some(const ConstBufferSequence& buffers,
-      BOOST_ASIO_MOVE_ARG(WriteHandler) handler)
+      BOOST_ASIO_MOVE_ARG(WriteToken) token
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
+      async_initiate<WriteToken,
+        void (boost::system::error_code, std::size_t)>(
+          declval<initiate_async_write_some>(), token, buffers)))
   {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a WriteHandler.
-    BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
-
-    boost::asio::async_completion<WriteHandler,
-      void (boost::system::error_code, std::size_t)> init(handler);
-
-    this->impl_.get_service().async_write_some(
-        this->impl_.get_implementation(),
-        buffers, init.completion_handler,
-        this->impl_.get_implementation_executor());
-
-    return init.result.get();
+    return async_initiate<WriteToken,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_write_some(this), token, buffers);
   }
 
   /// Read some data from the handle.
@@ -346,25 +415,31 @@ public:
   /// Start an asynchronous read.
   /**
    * This function is used to asynchronously read data from the stream handle.
-   * The function call always returns immediately.
+   * It is an initiating function for an @ref asynchronous_operation, and always
+   * returns immediately.
    *
    * @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.
+   * that they remain valid until the completion 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:
+   * @param token The @ref completion_token that will be used to produce a
+   * completion handler, which will be called when the read completes.
+   * Potential completion tokens include @ref use_future, @ref use_awaitable,
+   * @ref yield_context, or a function object with the correct completion
+   * signature. The function signature of the completion handler must be:
    * @code void handler(
    *   const boost::system::error_code& error, // Result of operation.
-   *   std::size_t bytes_transferred           // Number of bytes read.
+   *   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. On
-   * immediate completion, invocation of the handler will be performed in a
+   * not, the completion handler will not be invoked from within this function.
+   * On immediate completion, invocation of the handler will be performed in a
    * manner equivalent to using boost::asio::post().
    *
+   * @par Completion Signature
+   * @code void(boost::system::error_code, std::size_t) @endcode
+   *
    * @note The read operation may not read all of the requested number of bytes.
    * Consider using the @ref async_read function if you need to ensure that the
    * requested amount of data is read before the asynchronous operation
@@ -378,27 +453,102 @@ public:
    * 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.
+   *
+   * @par Per-Operation Cancellation
+   * This asynchronous operation supports cancellation for the following
+   * boost::asio::cancellation_type values:
+   *
+   * @li @c cancellation_type::terminal
+   *
+   * @li @c cancellation_type::partial
+   *
+   * @li @c cancellation_type::total
    */
-  template <typename MutableBufferSequence, typename ReadHandler>
-  BOOST_ASIO_INITFN_RESULT_TYPE(ReadHandler,
+  template <typename MutableBufferSequence,
+      BOOST_ASIO_COMPLETION_TOKEN_FOR(void (boost::system::error_code,
+        std::size_t)) ReadToken
+          BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+  BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
       void (boost::system::error_code, std::size_t))
   async_read_some(const MutableBufferSequence& buffers,
-      BOOST_ASIO_MOVE_ARG(ReadHandler) handler)
+      BOOST_ASIO_MOVE_ARG(ReadToken) token
+        BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    BOOST_ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
+      async_initiate<ReadToken,
+        void (boost::system::error_code, std::size_t)>(
+          declval<initiate_async_read_some>(), token, buffers)))
   {
-    // If you get an error on the following line it means that your handler does
-    // not meet the documented type requirements for a ReadHandler.
-    BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
-
-    boost::asio::async_completion<ReadHandler,
-      void (boost::system::error_code, std::size_t)> init(handler);
-
-    this->impl_.get_service().async_read_some(
-        this->impl_.get_implementation(),
-        buffers, init.completion_handler,
-        this->impl_.get_implementation_executor());
-
-    return init.result.get();
+    return async_initiate<ReadToken,
+      void (boost::system::error_code, std::size_t)>(
+        initiate_async_read_some(this), token, buffers);
   }
+
+private:
+  class initiate_async_write_some
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_write_some(basic_stream_handle* self)
+      : self_(self)
+    {
+    }
+
+    const executor_type& get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename WriteHandler, typename ConstBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(WriteHandler) handler,
+        const ConstBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a WriteHandler.
+      BOOST_ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
+
+      detail::non_const_lvalue<WriteHandler> handler2(handler);
+      self_->impl_.get_service().async_write_some(
+          self_->impl_.get_implementation(), buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_stream_handle* self_;
+  };
+
+  class initiate_async_read_some
+  {
+  public:
+    typedef Executor executor_type;
+
+    explicit initiate_async_read_some(basic_stream_handle* self)
+      : self_(self)
+    {
+    }
+
+    const executor_type& get_executor() const BOOST_ASIO_NOEXCEPT
+    {
+      return self_->get_executor();
+    }
+
+    template <typename ReadHandler, typename MutableBufferSequence>
+    void operator()(BOOST_ASIO_MOVE_ARG(ReadHandler) handler,
+        const MutableBufferSequence& buffers) const
+    {
+      // If you get an error on the following line it means that your handler
+      // does not meet the documented type requirements for a ReadHandler.
+      BOOST_ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
+
+      detail::non_const_lvalue<ReadHandler> handler2(handler);
+      self_->impl_.get_service().async_read_some(
+          self_->impl_.get_implementation(), buffers,
+          handler2.value, self_->impl_.get_executor());
+    }
+
+  private:
+    basic_stream_handle* self_;
+  };
 };
 
 } // namespace windows

linx64/include/boost/asio/windows/object_handle.hpp

@@ -2,7 +2,7 @@
 // windows/object_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
 // Copyright (c) 2011 Boris Schaeling (boris@highscore.de)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying

linx64/include/boost/asio/windows/overlapped_handle.hpp

@@ -2,7 +2,7 @@
 // windows/overlapped_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)

linx64/include/boost/asio/windows/overlapped_ptr.hpp

@@ -2,7 +2,7 @@
 // windows/overlapped_ptr.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)
@@ -53,9 +53,9 @@ public:
   template <typename ExecutionContext, typename Handler>
   explicit overlapped_ptr(ExecutionContext& context,
       BOOST_ASIO_MOVE_ARG(Handler) handler,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
     : impl_(context.get_executor(), BOOST_ASIO_MOVE_CAST(Handler)(handler))
   {
   }
@@ -64,9 +64,10 @@ public:
   template <typename Executor, typename Handler>
   explicit overlapped_ptr(const Executor& ex,
       BOOST_ASIO_MOVE_ARG(Handler) handler,
-      typename enable_if<
-        is_executor<Executor>::value
-      >::type* = 0)
+      typename constraint<
+        execution::is_executor<Executor>::value
+          || is_executor<Executor>::value
+      >::type = 0)
     : impl_(ex, BOOST_ASIO_MOVE_CAST(Handler)(handler))
   {
   }
@@ -86,9 +87,9 @@ public:
   /// object.
   template <typename ExecutionContext, typename Handler>
   void reset(ExecutionContext& context, BOOST_ASIO_MOVE_ARG(Handler) handler,
-      typename enable_if<
+      typename constraint<
         is_convertible<ExecutionContext&, execution_context&>::value
-      >::type* = 0)
+      >::type = 0)
   {
     impl_.reset(context.get_executor(), BOOST_ASIO_MOVE_CAST(Handler)(handler));
   }
@@ -97,9 +98,10 @@ public:
   /// object.
   template <typename Executor, typename Handler>
   void reset(const Executor& ex, BOOST_ASIO_MOVE_ARG(Handler) handler,
-      typename enable_if<
-        is_executor<Executor>::value
-      >::type* = 0)
+      typename constraint<
+        execution::is_executor<Executor>::value
+          || is_executor<Executor>::value
+      >::type = 0)
   {
     impl_.reset(ex, BOOST_ASIO_MOVE_CAST(Handler)(handler));
   }

linx64/include/boost/asio/windows/random_access_handle.hpp

@@ -2,7 +2,7 @@
 // windows/random_access_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)

linx64/include/boost/asio/windows/stream_handle.hpp

@@ -2,7 +2,7 @@
 // windows/stream_handle.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~
 //
-// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2023 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)