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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5. class A {
  6. 	public:
  7. 	int value;
  8. };
  9.  
  10.  
  11. // A reference passed by value - reassign the value.
  12. void myValFunction(A* value) {
  13. 	A other;
  14. 	other.value = 4;
  15. 	value = &other;
  16. }
  17.  
  18. // A reference passed by value - update its value.
  19. void myUpdateValFunction(A* value) {
  20. 	value->value = 5;
  21. }
  22.  
  23. // Pass by reference - reassign the reference.
  24. // You can't do this in JavaScript
  25. void myRefFunction(A& ref) {
  26. 	A other;
  27. 	other.value = 6;
  28. 	ref = other;
  29. }
  30.  
  31. int main() {
  32. 	// I'll create 3 A instances here (a#) and their references (r#)
  33. 	// In JavaScript, we only really interact with the r# value.
  34. 	A a1; A* r1 = &a1;
  35. 	A a2; A* r2 = &a2;
  36. 	A a3; A* r3 = &a3;
  37.  
  38. 	// Set some values through the reference.
  39. 	r1->value = 1;
  40. 	r2->value = 2;
  41. 	r3->value = 3;
  42.  
  43.  
  44. 	myValFunction(r1);
  45. 	myUpdateValFunction(r2);
  46.  
  47. 	myRefFunction(a3);
  48.  
  49. 	std::cout << r1->value << std::endl;
  50. 	std::cout << r2->value << std::endl;
  51. 	std::cout << r3->value << std::endl;
  52.  
  53. 	return 0;
  54. }
  55.  
Success #stdin #stdout 0s 4520KB
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https://ideone.com/zb4W3E
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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