#
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: t.
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template<class T> constexpr reference_wrapper<const T> cref(const T& t) noexcept;
4
#
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
#
Returns: t.

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