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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. using namespace std;
  5.  
  6. template <unsigned int x>
  7. constexpr enable_if_t<x != 0U, int> log2 = 1 + log2<x / 2U>;
  8.  
  9. template <>
  10. constexpr int log2<1U> = 0;
  11.  
  12. int main() {
  13.   int foo[log2<8U>];
  14.  
  15.   cout << log2<8U> << endl;
  16. }
Success #stdin #stdout 0s 15232KB
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3
https://ideone.com/Nc5cSB
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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