[C++] Class Template Inheritance

#include<iostream>
#include<cstdlib>
using namespace std;
template<class T>
class foo
{
    public:
    T a,b;
};
template<class T>
class bar:public foo<T>
{
    public:
    void show()
    {
        cout<<"Son";
    }
};
int main()
{
    bar<int> k;
    k.show();
    return 0;
}