typeid is a C++ keyword to determine a class type at runtime.


#include <cassert>

#include <string>

#include <typeinfo>



int main()

{

  assert(std::string(typeid(int).name())=="i");

  assert(std::string(typeid(double).name())=="d");

  assert(std::string(typeid(std::string).name())=="Ss");

}

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(C++) typeid