20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.5 Class template reference_­wrapper [refwrap]

20.14.5.4 Invocation [refwrap.invoke]

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template<class... ArgTypes> constexpr invoke_result_t<T&, ArgTypes...> operator()(ArgTypes&&... args) const;
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Mandates: T is a complete type.
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Returns: INVOKE(get(), std​::​forward<ArgTypes>(args)...).