temlate class

["learning c++" <learning_c@xxxxxxxxxxx>]

Hi,
I compíled a template class. I hope it can apply to int and double. Also, I 
hope to use vector class in my code. But it does not work.
Please help me.

#include <vector>
#include <iostream>

using namespace std;

template <class T> class vector1{
 int len;
 //double mean;
 T sum;
public:
 //double mean();
 T vector_sum (vector(T) &vec);
};

template <>
T vector1<T>::vector_sum(vector(T) &vec){
 vector<T>::iterator iter;
 for(iter=vec.begin();iter<vec.end();iter++)
   sum=sum+*iter;
 return sum;
}


int main(){
 int sum;
 double sum2;
 vector1<int> v1;
 vector1<double> v2;
 v1.push_back(1);
 v1.push_back(2);
 sum=vector1::vector_sum(v1);
 cout << "the result is: "<< sum<<endl;
 v2.push_back(1.1);
 v2.push_back(1.2);
 sum2=vector1::vector_sum(v2);
 return 0;

}

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