std::weak_equal

template< class T >
constexpr std::weak_equality weak_equal(const T& a, const T& b);

Compares two values using 3-way comparison and produces a result of type std::weak_equality.

Specifically,

• If the expression a <=> b is well-formed and its result is convertible to std::weak_equality, returns that result.
• Otherwise, if the expression a <=> b is well-formed, but its result is not convertible to std::weak_equality, then the function is defined as deleted.
• Otherwise, if the expression a <=> b is ill-formed, but the expression a == b is well-formed and convertible to bool,
• if a == b is true, returns std::weak_equality::equivalent
• otherwise, returns std::weak_equality::nonequivalent
• Otherwise, the function is defined as deleted.

Parameters

Return value

A value of type std::weak_equality, as described above.

Notes

Example

See also