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

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI) Library feature-test macros (C++20) Dynamic memory management Program utilities Coroutine support (C++20) Variadic functions is_constant_evaluated (C++20) is_within_lifetime (C++26) initializer_list (C++11) source_location (C++20) Three-way comparison (C++20) 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_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

General utilities Date and time Function objects Formatting library (C++20) 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) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17)

 

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)