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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. typedef void (*VF)();
  5.  
  6. VF Test() {
  7. 	return nullptr;
  8. }
  9.  
  10. int main(int argc, char* argv[]) {
  11. 	std::function<void()> foo;
  12. 	std::cout << !!foo << std::endl;
  13.  
  14. 	foo = nullptr;
  15. 	std::cout << !!foo << std::endl;
  16.  
  17. 	foo = Test();
  18. 	std::cout << !!foo << std::endl;
  19.  
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 3340KB
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https://ideone.com/0U1ZGJ
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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