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[concept.same]
# 18 Concepts library [[concepts]](./#concepts)
## 18.4 Language-related concepts [[concepts.lang]](concepts.lang#concept.same)
### 18.4.2 Concept same_as [concept.same]
[🔗](#itemdecl:1)
`template<class T, class U>
concept [same-as-impl](#concept:same-as-impl "18.4.2Concept same_­as[concept.same]") = [is_same_v](meta.type.synop#lib:is_same_v "21.3.3Header <type_­traits> synopsis[meta.type.synop]")<T, U>; // exposition only
template<class T, class U>
concept [same_as](#concept:same_as "18.4.2Concept same_­as[concept.same]") = [same-as-impl](#concept:same-as-impl "18.4.2Concept same_­as[concept.same]")<T, U> && [same-as-impl](#concept:same-as-impl "18.4.2Concept same_­as[concept.same]")<U, T>;
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/concepts.tex#L309)
[*Note [1](#note-1)*:
[same_as](#concept:same_as "18.4.2Concept same_­as[concept.same]")<T, U> subsumes [same_as](#concept:same_as "18.4.2Concept same_­as[concept.same]")<U, T> and
vice versa[.](#1.sentence-1)
— *end note*]