std::is_eq, std::is_neq, std::is_lt, std::is_gt, std::is_lteq, std::is_gteq
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
See also
|
(C++20) | the result type of 3-way comparison that supports all 6 operators, is not substitutable, and allows incomparable values (class) |
|
(C++20) | the result type of 3-way comparison that supports only equality/inequality and is not substitutable (class) |
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