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  1.     namespace detail
  2.     {
  3.         template<class T, int N>
  4.         struct helper
  5.         {
  6.             static constexpr T pow(const T x){
  7.                 return helper<T, N-1>::pow(x) * x;
  8.             }
  9.         };
  10.  
  11.         template<class T>
  12.         struct helper<T, 1>
  13.         {
  14.             static constexpr T pow(const T x){
  15.                 return x;
  16.             }
  17.         };
  18.  
  19.         template<class T>
  20.         struct helper<T, 0>
  21.         {
  22.             static constexpr T pow(const T x){
  23.                 return 1;
  24.             }
  25.         };
  26.     }
  27.  
  28.     template<int N, class T>
  29.     T constexpr pow(T const x)
  30.     {
  31.         return detail::helper<T, N>::pow(x);
  32.     }
  33.  
  34.     #include <iostream>
  35.  
  36.     int main()
  37.     {
  38.         std::cout << pow<5>(4);
  39.     }
  40.  
Success #stdin #stdout 0s 2852KB
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stdin 
Standard input is empty
stdout 
1024
https://ideone.com/2K9UzJ
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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