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Construct a random-access handle on an existing native handle.
basic_random_access_handle( const executor_type & ex, const native_handle_type & handle);
This constructor creates a random-access handle object to hold an existing native handle.
The I/O executor that the random-access handle will use, by default, to dispatch handlers for any asynchronous operations performed on the random-access handle.
The new underlying handle implementation.
Thrown on failure.