asd.cc

#include <iostream>

template<typename T>
struct type_trait
{
  template<typename U>
  struct pointer_trait
  {
    enum { result = false };
  };

  template<typename U>
  struct pointer_trait<U*>
  {
    enum { result = true };
  };

  enum { is_pointer = pointer_trait<T>::result };
};

int main(int argc, const char** argv)
{
  std::cout << type_trait<int *>::is_pointer << std::endl;
  std::cout << type_trait<int>::is_pointer << std::endl;

  return 0;
}