C++ Getting a Compile-Time Unique Numeric ID for a Type

gistfile1.cpp

#include <iostream>

template<typename T>
size_t numeric_handle() {
	static int x;
	return (size_t)(&x);
}

int main(int argc, char* argv[]) {
	using namespace std;
	cout << "int   " << numeric_handle<int>() << endl;
	cout << "float " << numeric_handle<float>() << endl;
	return 0;
}

You just return the address of the pointer.