Threshold Default Template Arguments

#include <iostream>
using namespace std;

template<typename T = int> 
T thresholdOrDefault(T v, T def = {}) {
    // Your code here
    if (v<0) return def;
    return v;
}

int main() {
   int v, def;
   if (cin.peek() == '-') { // value is negative
       cin >> v;
       if (cin.peek() == ' ') {
           cin >> def;
           cout << thresholdOrDefault(v, def) << "\n";
       } else {
           cout << thresholdOrDefault(v) << "\n";
       }
   } else {
       cin >> v;
       cout << thresholdOrDefault(v) << "\n";
   }
   return 0;
}