19 General utilities library [utilities]

19.14 Function objects [function.objects]

19.14.5 Class template reference_­wrapper [refwrap]

19.14.5.4 reference_­wrapper invocation [refwrap.invoke]

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template<class... ArgTypes> invoke_result_t<T&, ArgTypes...> operator()(ArgTypes&&... args) const;
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Returns: INVOKE(get(), std​::​forward<ArgTypes>(args)...).