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[support.rtti.general]
# 17 Language support library [[support]](./#support)
## 17.7 Type identification [[support.rtti]](support.rtti#general)
### 17.7.1 General [support.rtti.general]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3264)
The header [<typeinfo>](typeinfo.syn#header:%3ctypeinfo%3e "17.7.2Header <typeinfo> synopsis[typeinfo.syn]") defines a
type associated with type information generated by the implementation[.](#1.sentence-1)
It also defines two types for reporting dynamic type identification errors[.](#1.sentence-2)
The header [<typeindex>](type.index.synopsis#header:%3ctypeindex%3e "17.7.6Header <typeindex> synopsis[type.index.synopsis]") defines
a wrapper type for use as an index type in associative containers ([[associative]](associative "23.4Associative containers"))
and in unordered associative containers ([[unord]](unord "23.5Unordered associative containers"))[.](#1.sentence-3)