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  1. #include<iostream>
  2.  
  3. template<int N>
  4. struct is_power_of_two {
  5.     enum {val = (N > 1) & !(N & (N - 1))};
  6.     static_assert(val, "should use a power of 2 as template parameter");
  7. };
  8.  
  9. int main()
  10. {
  11. 	std::cout << is_power_of_two<2>::val << "\n";
  12. 	std::cout << is_power_of_two<3>::val << "\n";
  13. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In instantiation of 'is_power_of_two<3>':
prog.cpp:12:33:   instantiated from here
prog.cpp:6:5: error: static assertion failed: "should use a power of 2 as template parameter"
stdout
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Standard output is empty
https://ideone.com/M8K7a
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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