fork download
copy 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. typedef void (*F)();
  5.  
  6. template<F f> struct Goal
  7. {
  8. 	Goal() { f(); }
  9. };
  10.  
  11. template<F f> struct Singleton
  12. {
  13. 	static Goal<f> instance;
  14. 	Singleton() { (void)(&instance); }
  15. };
  16. template<F f> Goal<f> Singleton<f>::instance;
  17.  
  18. void foo() { cout << "foo" << endl; }
  19. void bar() { cout << "bar" << endl; }
  20.  
  21. int main() {
  22. 	Singleton<bar> tmp;
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
bar
https://ideone.com/oO6iaL
language:
C++14 (gcc 8.3)
created:
11 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!