fork download
copy 
  1. template<class T>
  2. class SomeTemplate
  3. {
  4. public:
  5.    SomeTemplate(T* p) { pData = p; }
  6.    T* getPointer() { return pData; }
  7.    template<class S>
  8.    SomeTemplate(SomeTemplate<S> s)
  9.    {
  10.        pData = s.getPointer();
  11.    }
  12. private:
  13.    T* pData;
  14. };
  15.  
  16. class A {};
  17. class B : public A {};
  18.  
  19. int main()
  20. {
  21.     SomeTemplate<B> b(new B());
  22.     SomeTemplate<A> a(b);
  23.     SomeTemplate<B> bb(a);
  24.     return 0;
  25. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
copy 
Standard input is empty
compilation info 
prog.cpp: In constructor ‘SomeTemplate<T>::SomeTemplate(SomeTemplate<S>) [with S = A, T = B]’:
prog.cpp:23:   instantiated from here
prog.cpp:10: error: invalid conversion from ‘A*’ to ‘B*’
stdout
copy 
Standard output is empty
https://ideone.com/BcJ2rD
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!