Difference between revisions of "cpp/utility/compare/named comparison functions"
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Revision as of 09:38, 5 September 2020
| Defined in header <compare>
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| 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
Contents |
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
| (C++20) |
the result type of 3-way comparison that supports all 6 operators, is not substitutable, and allows incomparable values (class) |
