problem with template function

can anyone tell me why when i call the binary search function in int main() it tells me it cant match it to the template i have set up?

Code:

---

#include <iostream>
#include <vector>

using namespace std;

template <typename T>
T binary_search(vector<T> data, T begin, T end, T searched_value)
{
  if(begin > end)
      return -1;
  T mid = (begin + end)/2;
  if (data[mid] == searched_value)
        return mid;
  else if (data[mid] < searched_value)
        return binary_search(data, mid + 1, end, searched_value);
  else
        return binary_search(data, begin, mid - 1, searched_value);
}


int main()
{
  vector<int> v;
  cout << "Enter a series of integers: " << "\n";
  int numbers;
  while(cin >> numbers)
    {
      v.push_back(numbers);
    }
  cout << "\n";
  cout << "What integer shall i search for?" << "\n";
  int n;
  cin >> n;
  int pos = binary_search(v, 0, v.size()-1, n);
  cout << "Found in position" << pos << "\n";
 
  return 0;
}

---

I would doubt that v.size()-1 is of the same type as the rest, since it's going to be unsigned.

In addition to the syntax error, you have a huge gaping logic error, since binary_search is going to require sorted data, which you don't have.