std::relation
Defined in header <concepts> | ||
|---|---|---|
template< class R, class T, class U >
concept relation =
std::predicate<R, T, T> && std::predicate<R, U, U> &&
std::predicate<R, T, U> && std::predicate<R, U, T>;
| (1) | (since C++20) |
The concept relation<R, T, U> specifies that R defines a binary relation over the set of expressions whose type and value category are those encoded by either T or U.
References
- C++23 standard (ISO/IEC 14882:2024):
- 18.7.5 Concept
relation[concept.relation] - C++20 standard (ISO/IEC 14882:2020):
- 18.7.5 Concept
relation[concept.relation]
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