You can used C++11 type_traits. Here is something to get you started, you can specialize more as needed:
#include <type_traits>
#include <iostream>
template<typename T, typename E = void>
struct A; // undefined
template<typename T>
struct A<T, typename std::enable_if<std::is_class<T>::value && !std::is_pod<T>::value>::type> {
A() { std::cout << "I'm a class, but I'm not a pod type" << std::endl; }
};
template<typename T>
struct A<T, typename std::enable_if<std::is_class<T>::value && std::is_pod<T>::value>::type> {
A() { std::cout << "I'm a class and a pod type" << std::endl; }
};
template<typename T>
struct A<T, typename std::enable_if<!std::is_class<T>::value>::type> {
A() { std::cout << "I'm not a class" << std::endl; }
};
class X {};
class Y { ~Y(){} };
int main()
{
A<X> a1;
A<Y> a2;
A<int> a3;
}
