basic_outcome(const basic_outcome &)
Copy constructor.
Requires: that value_type, error_type and exception_type all implement a copy constructor.
Complexity: Same as for value_type’s, error_type’s and exception_type’s copy constructors. Constexpr, triviality and noexcept of underlying operations is propagated.
Guarantees: If an exception is thrown during the operation, the object is left in a partially completed state, as per the normal rules for the same operation on a struct.



