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  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. class Parent{
  6. public:
  7. 	Parent operator=(const Parent&) = delete;
  8. 	Parent(const Parent&) = delete;
  9. 	Parent() = default;
  10. 	Parent(int complex) : test(complex) {}
  11.  
  12. 	virtual void func(){ cout << test; }
  13. private:
  14. 	int test = 0;
  15. };
  16.  
  17. class Parent2{
  18. public:
  19. 	Parent2 operator=(const Parent2&) = delete;
  20. 	Parent2(const Parent2&) = delete;
  21. 	Parent2() = default;
  22. 	Parent2(int complex) : test2(complex) {}
  23.  
  24. 	virtual void func2(){ cout << test2; }
  25. private:
  26. 	int test2 = 0;
  27. };
  28.  
  29. class Child : public Parent, public Parent2{
  30. public:
  31. 	Child operator=(const Child&) = delete;
  32. 	Child(const Child&) = delete;
  33.     Child(const char* parent, const char* parent2){
  34.     	const auto vTablePtrSize = sizeof(void*);
  35.     	const auto parentSize = sizeof(Parent);
  36.     	auto charPtrThis = reinterpret_cast<char*>(this);
  37.  
  38.     	memcpy(charPtrThis + vTablePtrSize,
  39.     	       parent + vTablePtrSize,
  40.     	       parentSize - vTablePtrSize);
  41.  
  42.         memcpy(charPtrThis + parentSize + vTablePtrSize,
  43.                parent2 + vTablePtrSize,
  44.                sizeof(Parent2) - vTablePtrSize);
  45. 	}
  46.  
  47. 	virtual void func(){ cout << "Child, parent says: "; Parent::func(); }
  48. 	virtual void func2(){ cout << "Child, parent2 says: "; Parent2::func2(); }
  49. };
  50.  
  51.  
  52.  
  53. int main() {
  54. 	Parent foo(13);
  55. 	Parent2 foo2(42);
  56. 	Child bar(reinterpret_cast<char*>(&foo), reinterpret_cast<char*>(&foo2));
  57.  
  58. 	bar.func();
  59. 	bar.func2();
  60.  
  61. 	return 0;
  62. }
Success #stdin #stdout 0s 3456KB
comments (?)
stdin 
Standard input is empty
stdout 
Child, parent says: 13Child, parent2 says: 42
https://ideone.com/1QOrMz
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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