C++ | Templates | Question 10

Output of following program.

#include <iostream> 
using namespace std; 
  
template <class T, int max> 
int arrMin(T arr[], int n) 
{ 
   int m = max; 
   for (int i = 0; i < n; i++) 
      if (arr[i] < m) 
         m = arr[i]; 
  
   return m; 
} 
  
int main() 
{ 
   int arr1[]  = {10, 20, 15, 12}; 
   int n1 = sizeof(arr1)/sizeof(arr1[0]); 
  
   char arr2[] = {1, 2, 3}; 
   int n2 = sizeof(arr2)/sizeof(arr2[0]); 
  
   cout << arrMin<int, 10000>(arr1, n1) << endl; 
   cout << arrMin<char, 256>(arr2, n2); 
   return 0; 
} 

(A) Compiler error, template argument must be a data type.
(B)

10
1

(C)

10000
256

(D)

1
1

Answer: (B)

Explanation: We can pass non-type arguments to templates. Non-type parameters are mainly used for specifying max or min values or any other constant value for a particular instance of template. The important thing to note about non-type parameters is, they must be const. Compiler must know the value of non-type parameters at compile time. Because compiler needs to create functions/classes for a specified non-type value at compile time.

Following is another example of non-type parameters.

#include <iostream>
using namespace std;

template 
 T fun (T arr[], int size)
{
    if (size > N)
      cout << "Not possible";
    T max = arr[0];
   for (int i = 1; i < size; i++)
      if (max < arr[i])
          max = arr[i];
   return max;
}

int main ()
{
    int arr[] = {12, 3, 14};
    cout << fun  (arr, 3);
}

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