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[alg.req.sortable]
# 24 Iterators library [[iterators]](./#iterators)
## 24.3 Iterator requirements [[iterator.requirements]](iterator.requirements#alg.req.sortable)
### 24.3.7 Common algorithm requirements [[alg.req]](alg.req#sortable)
#### 24.3.7.8 Concept sortable [alg.req.sortable]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L2723)
The [sortable](#concept:sortable "24.3.7.8Concept sortable[alg.req.sortable]") concept specifies the common requirements of
algorithms that permute sequences into ordered sequences (e.g., sort)[.](#1.sentence-1)
template<class I, class R = ranges::less, class P = identity>concept [sortable](#concept:sortable "24.3.7.8Concept sortable[alg.req.sortable]") =[permutable](alg.req.permutable#concept:permutable "24.3.7.6Concept permutable[alg.req.permutable]")<I> &&[indirect_strict_weak_order](indirectcallable.indirectinvocable#concept:indirect_strict_weak_order "24.3.6.3Indirect callables[indirectcallable.indirectinvocable]")<R, projected<I, P>>;