get RTTI type name in runtime

black_magic.cpp

#include <cstdio>

//black magic
struct Hacked {
	void **vt;
};

template<typename T>
const char *getRuntimeTypename(T *type) {
	auto type_info = (void **) ((Hacked *) type)->vt[-1];
	auto type_name = (char *) type_info[1];
	return type_name;
}

template<typename T>
void printType(T *type) {
	printf("%s\n", getRuntimeTypename(type));
}
//

class X {
    virtual void foo() {}
};

int main() {
    X x;
    printType(&x);
}