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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5.  
  6. class Foobar {
  7. public:
  8. 	Foobar(int x) : x(x) {
  9. 	}
  10.  
  11. 	void frobnicate_1() {
  12. 		cout << "In frobnicate_1, this=" << this << endl;
  13. 	}
  14.  
  15. 	void frobnicate_2() {
  16. 		cout << "In frobnicate_2, this=" << this
  17. 			 << ", y=" << Foobar::y  // doesn’t lookup “this”
  18. 			 << ", x=" << flush;
  19.  
  20. 		cout << this->x << endl;  // crash, if “this” isn’t valid
  21. 	}
  22. private:
  23. 	int x;
  24. 	static int y;
  25. };
  26.  
  27. int Foobar::y = -3;
  28.  
  29.  
  30. int main() {
  31. 	Foobar a(5);
  32.  
  33. 	Foobar* f = &a;
  34. 	f->frobnicate_1();
  35. 	f->frobnicate_2();
  36.  
  37. 	f = nullptr;
  38. 	f->frobnicate_1();
  39. 	f->frobnicate_2(); // crash!
  40. }
  41.  
Runtime error #stdin #stdout 0s 3468KB
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stdin
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Standard input is empty
stdout
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In frobnicate_1, this=0xff81fc9c
In frobnicate_2, this=0xff81fc9c, y=-3, x=5
In frobnicate_1, this=0
In frobnicate_2, this=0, y=-3, x=
https://ideone.com/5YE0I4
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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