std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq (3) - Linux Manuals
std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq: std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq
NAME
std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq - std::is_eq,std::is_neq,std::is_lt,std::is_gt,std::is_lteq,std::is_gteq
Synopsis
Defined in header <compare>
constexpr bool is_eq(std::weak_equality cmp) noexcept; (1) (since C++20)
constexpr bool is_neq(std::weak_equality 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
This section is incomplete
Reason: no example
See also
partial_ordering the result type of 3-way comparison that supports all 6 operators, is not substitutable, and allows incomparable values
(C++20)
weak_equality the result type of 3-way comparison that supports only equality/inequality and is not substitutable
(C++20)