20 General utilities library [utilities]

20.14 Function objects [function.objects]

20.14.5 Class template reference_­wrapper [refwrap]

20.14.5.5 Helper functions [refwrap.helpers]

1
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The template parameter T of the following ref and cref function templates may be an incomplete type.
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template<class T> constexpr reference_wrapper<T> ref(T& t) noexcept;
2
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Returns: reference_­wrapper<T>(t).
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template<class T> constexpr reference_wrapper<T> ref(reference_wrapper<T> t) noexcept;
3
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Returns: ref(t.get()).
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template<class T> constexpr reference_wrapper<const T> cref(const T& t) noexcept;
4
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Returns: reference_­wrapper <const T>(t).
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template<class T> constexpr reference_wrapper<const T> cref(reference_wrapper<T> t) noexcept;
5
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Returns: cref(t.get()).