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  1. #include <iostream>
  2. #include <functional>
  3. using namespace std;
  4.  
  5. class X
  6. {
  7. 	static std::function<void()> f;
  8. 	public:
  9. 	template<typename T = decltype(f)>
  10.     void test(T fn = f){
  11.     fn();
  12.    }
  13. };
  14.  
  15. std::function<void()> X:: f = []{};
  16. int main() {
  17.  
  18.  
  19. X xx;
  20.  
  21. auto l =[]{std::cout << "Hello POW" <<std::endl ;};
  22. xx.test(l);
  23. xx.test();
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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Hello POW
https://ideone.com/s092Os
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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