http://stackoverflow.com/questions/8430906/constructor-templ

#include<iostream>

using namespace std;

enum obj_type{obj1,obj2};

template<int N>
struct obj
{
};



template <class T>
class A
{
    public:
A(int, int);
    private:
            int a_;
        int b_;
        obj_type type;
};


template<>
A<obj<obj1> >::A(int a, int b):a_(a),b_(b)
{
cout<<"case 1"<<endl;
this->type=obj1;
}


template<>
A<obj<obj2> >::A(int a, int b):a_(a)
{
b_=0;
cout<<"case 2"<<endl;
this->type=obj2;
}



int main()
{

    A<obj<obj2> > a(1,2);
return 1;
}