Using an overloaded function template : overload template function « template « C++ Tutorial

1. C++ Tutorial
2. template
3. overload template function

#include <iostream>
using std::cout;
using std::endl;

template<class T> T larger(T a, T b);
long* larger(long* a, long* b);
template <class T> T larger (const T array[], int count); // Overloaded templat
e prototype

int main() {
  cout << "Larger of 1.5 and 2.5 is " << larger(1.5, 2.5) << endl;
  cout << "Larger of 3.5 and 4.5 is " << larger(3.5, 4.5) << endl;
 
  int a_int = 35;
  int b_int = 45;
  cout << larger(a_int, b_int)<< endl;

  
  long a_long = 9;
  long b_long = 8;
  cout << larger(a_long, b_long)<< endl;

  cout << *larger(&a_long,&b_long)<< endl;

  double x[] = { 10.5, 12.5, 2.5, 13.5, 5.5 };

  cout << larger(x, sizeof x/sizeof x[0]) << endl;

return 0;
}

template <class T> T larger(T a, T b) {
  cout << "standard version " << endl;
  return a>b ? a : b;
}

long* larger(long* a, long* b) {
  cout << "overloaded version for long* " << endl;
  return *a>*b ? a : b;
}

template <class T> T larger (const T array[], int count) {
  cout << "template overload version for arrays " << endl;
  T result = array[0];
  for(int i = 1 ; i < count ; i++)
    if(array[i] > result)
      result = array[i];
  return result;
}

standard version
Larger of 1.5 and 2.5 is 2.5
standard version
Larger of 3.5 and 4.5 is 4.5
standard version
45
standard version
9
overloaded version for long*
9
template overload version for arrays
13.5