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### Concept <a id="concept.same">[[concept.same]]</a>
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``` cpp
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template<class T, class U>
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concept same-as-impl = is_same_v<T, U>; // exposition only
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template<class T, class U>
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concept same_as = same-as-impl<T, U> && same-as-impl<U, T>;
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```
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[*Note 1*: `same_as<T, U>` subsumes `same_as<U, T>` and vice
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versa. — *end note*]
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