20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.5 Function template invoke [func.invoke]

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template<class F, class... Args> constexpr invoke_result_t<F, Args...> invoke(F&& f, Args&&... args) noexcept(is_nothrow_invocable_v<F, Args...>);
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Returns: INVOKE(std​::​forward<F>(f), std​::​forward<Args>(args)...).