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  1. struct data
  2. {
  3. 	char c[100];
  4. };
  5.  
  6. class view
  7. {
  8. public:
  9. 	view(data d) :
  10. 		first(&d.c[0]),
  11. 		last(&d.c[100])
  12. 	{
  13.  
  14. 	}
  15. private:
  16. 	char * first;
  17. 	char * last;
  18. };
  19.  
  20. class data_interface
  21. {
  22. 	virtual view get_view() = 0;
  23. };
  24.  
  25. class base_owns_data : public data_interface
  26. {
  27. public:
  28. 	view get_view() override
  29. 	{
  30. 		return view(d);
  31. 	}
  32.  
  33. private:
  34. 	data d;
  35. };
  36.  
  37. view some_process(base_owns_data *b)
  38. {
  39. 	auto working_view = b->base_owns_data::get_view();
  40. 	// Do a bunch of things to filter the view
  41. 	return working_view;
  42. }
  43.  
  44. class derived_owns_data : public base_owns_data
  45. {
  46. public:
  47. 	base_owns_data * as_base()
  48. 	{
  49. 		return this;
  50. 	}
  51.  
  52. 	view get_view() override
  53. 	{
  54. 		return some_process(this->as_base());	
  55. 	}
  56. };
  57.  
  58.  
  59. int main() {
  60. 	derived_owns_data d;
  61. 	d.get_view();
  62. 	return 0;
  63. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/lPtJ8f
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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