22 General utilities library [utilities]

22.8 Expected objects [expected]

22.8.6 Class template expected [expected.expected]

22.8.6.8 Equality operators [expected.object.eq]

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template<class T2, class E2> requires (!is_void_v<T2>) friend constexpr bool operator==(const expected& x, const expected<T2, E2>& y);
1
#
Mandates: The expressions *x == *y and x.error() == y.error() are well-formed and their results are convertible to bool.
2
#
Returns: If x.has_value() does not equal y.has_value(), false; otherwise if x.has_value() is true, *x == *y; otherwise x.error() == y.error().
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template<class T2> friend constexpr bool operator==(const expected& x, const T2& v);
3
#
Mandates: The expression *x == v is well-formed and its result is convertible to bool.
[Note 1: 
T need not be Cpp17EqualityComparable.
— end note]
4
#
Returns: x.has_value() && static_cast<bool>(*x == v).
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template<class E2> friend constexpr bool operator==(const expected& x, const unexpected<E2>& e);
5
#
Mandates: The expression x.error() == e.error() is well-formed and its result is convertible to bool.
6
#
Returns: !x.has_value() && static_cast<bool>(x.error() == e.error()).