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Showing content from https://cplusplus.com/reference/typeindex/type_index/ below:

class

<typeindex>

Type index

The class provides direct access to the name and hash_code members of type_info.

(constructor)

Construct type_index (public member function)

hash_code

Get type hash code (public member function)

name

Get type name (public member function)

(relational operators)

type_index operators (public member function)

hash<type_index>

Hash for type_index (class template specialization)

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// type_index example
#include <iostream>       // std::cout
#include <typeinfo>       // operator typeid
#include <typeindex>      // std::type_index
#include <unordered_map>  // std::unordered_map
#include <string>         // std::string

struct C {};

int main()
{
  std::unordered_map<std::type_index,std::string> mytypes;

  mytypes[typeid(int)]="Integer type";
  mytypes[typeid(double)]="Floating-point type";
  mytypes[typeid(C)]="Custom class named C";

  std::cout << "int: " << mytypes[typeid(int)] << '\n';
  std::cout << "double: " << mytypes[typeid(double)] << '\n';
  std::cout << "C: " << mytypes[typeid(C)] << '\n';

  return 0;
}

int: Integer type
double: Floating-point type
C: Custom class named C

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