#include <stdio.h>
#include <type_traits>
 
void print()
{
    printf("cheers from print !\n");
}
 
class A 
{
  public:
  void print()
  {
      printf("cheers from A !\n");
  }
};
 
template<typename Function>
void run(Function& f, std::true_type tag)
{
   f();
}
 
template<typename Object>
void run(Object& o, std::false_type tag)
{
   o.print();
}
 
 
template<typename T>
void run(T& t)
{
   constexpr bool is_fun = std::is_function<typename std::remove_pointer<T>::type >::value;
   run(t, std::integral_constant<bool, is_fun>());
}
 
int main()
{
    run(print);
 
    A a;
    run(a);
 
    return 0;
}
 

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