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Construct a descriptor without opening it.
template<
    typename ExecutionContext>
basic_descriptor(
    ExecutionContext & context,
    typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);
This constructor creates a descriptor without opening it.
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.