ErrorCondEnum constructor. Calls
void on_outcome_construction(T *, U &&) noexcept
predicate::enable_error_condition_converting_constructor<R> is true.
Complexity: Same as for
error_type’s copy or move constructor from the result of
make_error_code(ErrorCondEnum). Constexpr, triviality and noexcept of underlying operations is propagated.
Guarantees: If an exception is thrown during the operation, the state of the input is left indeterminate.