# std::Relation

From cppreference.com
< cpp‎ | concepts

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`.

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/concepts/Relation&oldid=106952"