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