tmp/tmpz3bjm5hj/{from.md → to.md}
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### Class `identity` <a id="func.identity">[[func.identity]]</a>
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``` cpp
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struct identity {
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template<class T>
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constexpr T&& operator()(T&& t) const noexcept;
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using is_transparent = unspecified;
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};
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template<class T>
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constexpr T&& operator()(T&& t) const noexcept;
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```
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*Effects:* Equivalent to: `return std::forward<T>(t);`
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