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

 

C++

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Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Program utilities Variadic functions initializer_list (C++11) is_constant_evaluated (C++20) is_within_lifetime (C++26) source_location (C++20) Coroutine support (C++20) Contract support (C++26) Three-way comparison three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20)   is_eqis_ltis_lteq (C++20)(C++20)(C++20)   is_neqis_gtis_gteq (C++20)(C++20)(C++20)

General utilities Function objects Bit manipulation (C++20) C-style bit manipulation (C++26) bitset hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator>    rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)   cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) to_underlying (C++23) forward (C++11) forward_like (C++23) move (C++11) move_if_noexcept (C++11) as_const (C++17) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) expected (C++23)

 

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

Example

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)

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