The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
#include <iostream>
template<typename T>
int f(T)
{
return 1;
}
template<typename T>
int f(T*)
{
return 2;
}
int main()
{
std::cout << f(0); // calls f<T>(T)
std::cout << f(nullptr); // calls f<T>(T)
std::cout << f((int*)nullptr); // calls f<T>(T*)
}