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#include <iostream>
#include <vector>
using namespace std;
template<typename T>
 
 
template<typename T>
std::vector<T> slice(std::vector<T> const &v, int m, int n)
{
    auto first = v.cbegin() + m;
    auto last = v.cbegin() + n + 1;
 
    std::vector<T> vec(first, last);
    return vec;
}
 
int main()
{
    // input vector
    std::vector<int> v = { 1, 2, 3, 4, 2, 2, 4, 6, 5 };
 
    vector<int>::iterator ptr; 
    // starting and ending index
    int m = 4, n = 7;
 
    std::vector<int> sub_vec = slice(v, m, n);
    ptr = sub_vec.begin();
    cout<<&(*ptr)<<" ";
    ptr = v.begin()+4;
    //print(sub_vec);
    cout<<&(*ptr)<<" ";
    ptr = v.begin()+4;
 
    return 0;
}

prog.cpp:7:10: error: declaration of template parameter ‘T’ shadows template parameter
 template<typename T>
          ^~~~~~~~
prog.cpp:4:10: note: template parameter ‘T’ declared here
 template<typename T>
          ^~~~~~~~
prog.cpp:8:16: error: too many template-parameter-lists
 std::vector<T> slice(std::vector<T> const &v, int m, int n)
                ^~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:26:45: error: ‘slice’ was not declared in this scope
     std::vector<int> sub_vec = slice(v, m, n);
                                             ^

Standard output is empty