# `bool operator==(const success_type<A> &) const`

Returns true if this result is successful and its value compares equal to the value in the success type sugar. Comparison is done using `operator==` on `value_type` and `A`. If `A` is `void`, this call aliases `bool has_value() const noexcept` .

Requires: `operator==` must be a valid expression between `value_type` and `A`, or `A` is `void`. If `value_type` is `void`, then so must be `A`.

Complexity: Whatever the underlying `operator==` has. Constexpr and noexcept of underlying operations is propagated.

Guarantees: None.

Last revised: January 20, 2019 at 16:02:33 UTC