std::relation
From cppreference.com
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relation
(C++20)
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Exposition-only concepts
(C++20)
Defined in header
<concepts>
template< class R, class T, class U >
(1)
(since C++20)
concept relation =
std::predicate <R, T, T> && std::predicate <R, U, U> &&
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.
[edit] References
- C++23 standard (ISO/IEC 14882:2024):
- 18.7.5 Concept
relation[concept.relation]
- 18.7.5 Concept
- C++20 standard (ISO/IEC 14882:2020):
- 18.7.5 Concept
relation[concept.relation]
- 18.7.5 Concept