Using Default Arguments with Template Classes

   
#include <iostream>
#include <cstdlib>
using namespace std;
   
template <class T=int, int size=10> class MyClass {
  T a[size]; // size of array is passed in size
public:
  MyClass() {
    register int i;
    for(i=0; i<size; i++) a[i] = i;
  }
  T &operator[](int i);
};
   
template <class T, int size>
T &MyClass<T, size>::operator[](int i)
{
  if(i<0 || i> size-1) {
    cout << "\nIndex value of ";
    cout << i << " is out-of-bounds.\n";
    exit(1);
  }
  return a[i];
}
   
int main()
{
  MyClass<int, 100> intarray;  
  MyClass<double> doublearray; 
  MyClass<> defarray;          
   
  cout << "int array: ";
  for(int i=0; i<100; i++) intarray[i] = i;
  for(int i=0; i<100; i++) cout << intarray[i] << endl;
   
  cout << "double array: ";
  for(int i=0; i<10; i++) doublearray[i] = (double) i/3;
  for(int i=0; i<10; i++) cout << doublearray[i] << endl;
   
  cout << "defarray array: ";
  for(int i=0; i<10; i++) defarray[i] = i;
  for(int i=0; i<10; i++) cout << defarray[i] << endl;
   
  return 0;
}

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Using Default Arguments with Template Classes : template class « Class « C++

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