std::predicate(3) Library Functions Manual std::predicate(3)

std::predicate - [concept.predicate], concept predicate

#include <concepts>

template<typename _Fn, typename... _Args>
concept std::predicate =  regular_invocable<_Fn, _Args...>
      && __detail::__boolean_testable<invoke_result_t<_Fn, _Args...>>

[concept.predicate], concept predicate

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