C++ | Templates | Question 10

Output?

#include <iostream>
using namespace std;

template<int n> struct funStruct
{
    static const int val = 2*funStruct<n-1>::val;
};

template<> struct funStruct<0>
{
    static const int val = 1 ;
};

int main()
{
    cout << funStruct<10>::val << endl;
    return 0;
}

(A) Compiler Error
(B) 1024
(C) 2
(D) 1


Answer: (B)

Explanation: This is an example of template metaprogramming. The program mainly calculates 2^10.

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