std::relation(3) Library Functions Manual std::relation(3) NAME std::relation - [concept.relation], concept relation SYNOPSIS #include Concept definition template concept relation = predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up> && predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp> Detailed Description [concept.relation], concept relation Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ std::relation(3)