[indirectcallable.general]

# 24 Iterators library [[iterators]](./#iterators)

## 24.3 Iterator requirements [[iterator.requirements]](iterator.requirements#indirectcallable.general)

### 24.3.6 Indirect callable requirements [[indirectcallable]](indirectcallable#general)

#### 24.3.6.1 General [indirectcallable.general]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L2430)

There are several concepts that group requirements of algorithms that
take callable objects ([[func.def]](func.def "22.10.3 Definitions")) as arguments[.](#1.sentence-1)