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Construct a random-access handle without opening it.
template< typename ExecutionContext> basic_random_access_handle( ExecutionContext & context, typename constraint< is_convertible< ExecutionContext &, execution_context & >::value, defaulted_constraint >::type = defaulted_constraint());
This constructor creates a random-access handle without opening it. The handle needs to be opened or assigned before data can be written to or read from it.
An execution context which provides 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.