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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class PtrHolder
  6. {
  7. 	private:
  8. 	char *x_;
  9. 	public:
  10. 	PtrHolder(char *x): x_(x) {}
  11. 	void print(){cout<<"Ptr is "<<*x_<<endl;}
  12. };
  13.  
  14. class RefHolder
  15. {
  16. 	private:
  17. 	char &x_;
  18. 	public:
  19. 	RefHolder(char &x): x_(x) {}
  20. 	void print(){cout<<"Ref is "<<x_<<endl;}
  21. };
  22.  
  23. class ValueHolder
  24. {
  25. 	private:
  26. 	char x_;
  27. 	public:
  28. 	ValueHolder(char x): x_(x) {}
  29. 	void print(){cout<<"Value is "<<x_<<endl;}
  30. };
  31.  
  32. int main() {
  33. 	char c = 'a';
  34. 	PtrHolder p(&c);
  35. 	RefHolder r(c);
  36. 	ValueHolder v(c);
  37. 	c = 'b';
  38. 	p.print();
  39. 	cout<<"PtrHolder is "<<sizeof(PtrHolder)<<" bytes"<<endl;
  40. 	r.print();
  41. 	cout<<"RefHolder is "<<sizeof(RefHolder)<<" bytes"<<endl;
  42. 	v.print();
  43. 	cout<<"ValueHolder is "<<sizeof(ValueHolder)<<" bytes"<<endl;	return 0;
  44. }
Success #stdin #stdout 0s 4516KB
comments (?)
stdin
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Standard input is empty
stdout
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Ptr is b
PtrHolder is 8 bytes
Ref is b
RefHolder is 8 bytes
Value is a
ValueHolder is 1 bytes
https://ideone.com/oi9y3N
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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