[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 "24.3.7.8 Concept 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 "24.3.7.8 Concept sortable [alg.req.sortable]") =[permutable](alg.req.permutable#concept:permutable "24.3.7.6 Concept permutable [alg.req.permutable]")<I> &&[indirect_strict_weak_order](indirectcallable.indirectinvocable#concept:indirect_strict_weak_order "24.3.6.3 Indirect callables [indirectcallable.indirectinvocable]")<R, projected<I, P>>;