std::is_eq, std::is_neq, std::is_lt, std::is_gt, std::is_lteq, std::is_gteq

 

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Defined in header <compare>
constexpr bool is_eq( std::partial_ordering cmp ) noexcept;	(1)	(since C++20)
constexpr bool is_neq( std::partial_ordering cmp ) noexcept;	(2)	(since C++20)
constexpr bool is_lt( std::partial_ordering cmp ) noexcept;	(3)	(since C++20)
constexpr bool is_lteq( std::partial_ordering cmp ) noexcept;	(4)	(since C++20)
constexpr bool is_gt( std::partial_ordering cmp ) noexcept;	(5)	(since C++20)
constexpr bool is_gteq( std::partial_ordering cmp ) noexcept;	(6)	(since C++20)

These functions take a result of 3-way comparison and convert it to the result of one of the six relational operators

Specifically, these functions return

1) cmp == 0

2) cmp != 0

3) cmp < 0

4) cmp <= 0

5) cmp > 0

6) cmp >= 0

Parameters

cmp

-

result of 3-way comparison

Return value

bool result of the corresponding relational operation

See also

partial_ordering (C++20)

the result type of 3-way comparison that supports all 6 operators, is not substitutable, and allows incomparable values (class)