std::predicate(3) C++ Standard Libary std::predicate(3) NAME std::predicate - std::predicate Synopsis Defined in header <concepts> template< class F, class... Args > concept predicate = (since C++20) std::regular_invocable<F, Args...> && boolean-testable<std::invoke_result_t<F, Args...>>; The concept std::predicate<F, Args...> specifies that F is a predicate that accepts arguments whose types and value categories are encoded by Args..., i.e., it can be invoked with these arguments to produce a boolean-testable result. Note that regular_invocable requires the invocation to not modify either the callable object or the arguments and be equality-preserving. Equality preservation Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise). http://cppreference.com 2024.06.10 std::predicate(3)
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