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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <int N>
  5. struct pow2 
  6. {
  7.     enum { value = 2 * pow2<N - 1>::value };
  8. };
  9.  
  10. template <>
  11. struct pow2<0> 
  12. {
  13.     enum { value = 1 };
  14. };
  15.  
  16. int  main()
  17. {
  18.     const int x = pow2<4>::value; // == 16
  19.     const int y = pow2<0>::value; // == 1
  20.     char arr[x]; // Because x is constant
  21.     cout << "Array size is " << sizeof arr << endl;
  22. }
  23.  
  24.  
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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Array size is 16
https://ideone.com/RUfCG4
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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