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  1. #include <functional>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. struct Holder {
  6.  
  7. 	void init() {
  8. 		callback = [=]() { cout << "In the callback, value == " << value << endl; };
  9. 	}
  10.  
  11. 	void speak() {
  12. 		cout << "In speak(), value == " << value << endl;
  13. 	}
  14.  
  15. 	function<void()> callback;
  16. 	string value;
  17. };
  18.  
  19. int main() {
  20. 	Holder h;
  21. 	h.value = "initial";
  22. 	h.init();
  23. 	h.value = "updated";
  24. 	h.callback();
  25. 	h.speak();
  26. 	return 0;
  27. }
Success #stdin #stdout 0.01s 5280KB
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Standard input is empty
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In the callback, value == updated
In speak(), value == updated
https://ideone.com/HMrInR
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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