[type.index.synopsis]

# 17 Language support library [[support]](./#support)

## 17.7 Type identification [[support.rtti]](support.rtti#type.index.synopsis)

### 17.7.6 Header <typeindex> synopsis [type.index.synopsis]

[ð](#header:%3ctypeindex%3e)

#include <compare> // see [[compare.syn]](compare.syn "17.12.1 Header <compare> synopsis")namespace std {class type_index; template<class T> struct hash; template<> struct hash<type_index>;}
