bool operator!=(const success_type<A> &) const
Returns true if this outcome is not successful or its value does not compares equal to the value in the success type sugar. Comparison is done using
void, this call aliases
bool has_error() const noexcept
operator!= must be a valid expression between
void, then so must be
Complexity: Whatever the underlying
operator!= has. Constexpr and noexcept of underlying operations is propagated.