c++ templates

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cassert>
using namespace std;

/*Write the class AddElements here*/
template<class T>
class AddElements{
    T element;
public:
    AddElements(T data){element = data;}
    T concatenate(T data2)
    {
        return element + data2;
    }
    T add(T data2)
    {
        return element + data2;
    }
};
/*template<>
class AddElements<double>{
    double element;
public:
    AddElements(double data){element = data; }
    double add(double data1)
    {
        return element + data1;
    }
};*/
/*template<>
class AddElements<int>{
    int element;
public:
    AddElements(int data){element = data; }
    int add(double data1)
    {
        return element + data1;
    }
};*/
int main () {
  int n,i;
  cin >> n;
  for(i=0;i<n;i++) {
    string type;
    cin >> type;
    if(type=="float") {
        double element1,element2;
        cin >> element1 >> element2;
        AddElements<double> myfloat (element1);
        cout << myfloat.add(element2) << endl;
    }
    else if(type == "int") {
        int element1, element2;
        cin >> element1 >> element2;
        AddElements<int> myint (element1);
        cout << myint.add(element2) << endl;
    }
    else if(type == "string") {
        string element1, element2;
        cin >> element1 >> element2;
        AddElements<string> mystring (element1);
        cout << mystring.concatenate(element2) << endl;
    }
  }
  return 0;
}