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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 Child : public Parent{
  18. public:
  19. 	Child operator=(const Child&) = delete;
  20. 	Child(const Child&) = delete;
  21.     Child(const Parent* parent){
  22.     	const auto vTablePtrSize = sizeof(void*);
  23.  
  24.     	memcpy(reinterpret_cast<char*>(this) + vTablePtrSize,
  25.     	       reinterpret_cast<const char*>(parent) + vTablePtrSize,
  26.     	       sizeof(Parent) - vTablePtrSize);
  27. 	}
  28.  
  29. 	virtual void func(){ cout << "Child, parent says: "; Parent::func(); }
  30. };
  31.  
  32. int main() {
  33. 	Parent foo(13);
  34. 	Child bar(&foo);
  35.  
  36. 	bar.func();
  37.  
  38. 	return 0;
  39. }
Success #stdin #stdout 0s 3140KB
comments (?)
stdin
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Standard input is empty
stdout
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Child, parent says: 13
https://ideone.com/f7vQsX
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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