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Showing content from https://timsong-cpp.github.io/cppwp/n4659/refwrap.helpers below:

[refwrap.helpers]

23 General utilities library [utilities] 23.14 Function objects [function.objects] 23.14.5 Class template reference_­wrapper [refwrap] 23.14.5.5 reference_­wrapper helper functions [refwrap.helpers]

template <class T> reference_wrapper<T> ref(T& t) noexcept;

Returns: reference_­wrapper<T>(t).

template <class T> reference_wrapper<T> ref(reference_wrapper<T> t) noexcept;

template <class T> reference_wrapper<const T> cref(const T& t) noexcept;

Returns: reference_­wrapper <const T>(t).

template <class T> reference_wrapper<const T> cref(reference_wrapper<T> t) noexcept;


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