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#### Exposition only helper functions <a id="optional.ref.expos">[[optional.ref.expos]]</a>
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``` cpp
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template<class U>
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constexpr void convert-ref-init-val(U&& u); // exposition only
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```
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*Effects:* Creates a variable `r` as if by `T& r(std::forward<U>(u));`
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and then initializes *val* with `addressof(r)`.
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