fork(6) download
copy 
  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
comments (?)
stdin
copy 
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
copy 
Standard output is empty
https://ideone.com/M8K7a
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!