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Construct an overlapped handle without opening it.
template<
    typename ExecutionContext>
basic_overlapped_handle(
    ExecutionContext & context,
    typename constraint< is_convertible< ExecutionContext &, execution_context & >::value, defaulted_constraint >::type  = defaulted_constraint());
This constructor creates an overlapped handle without opening it.
An execution context which provides the I/O executor that the overlapped handle will use, by default, to dispatch handlers for any asynchronous operations performed on the overlapped handle.