Construct a stream handle on an existing native handle.
template< typename ExecutionContext> basic_stream_handle( ExecutionContext & context, const native_handle_type & handle, typename constraint< is_convertible< ExecutionContext &, execution_context & >::value >::type = 0);
This constructor creates a stream handle object to hold an existing native handle.
An execution context which provides the I/O executor that the stream handle will use, by default, to dispatch handlers for any asynchronous operations performed on the stream handle.
The new underlying handle implementation.
Thrown on failure.