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  1. #include <iostream>
  2.  
  3. struct A
  4. {
  5.     void do_something() { std::cout << "A::do_something\n"; }
  6. };
  7.  
  8. struct B : public A
  9. {
  10.     virtual void do_something() override { std::cout << "B::do_something\n"; }
  11. };
  12.  
  13. int main()
  14. {
  15.     A a;
  16.     B b;
  17.  
  18.     A* ptr = &a ;
  19.     ptr->do_something();
  20.  
  21.     ptr = &b;
  22.     ptr->do_something();
  23. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:10:18: error: ‘virtual void B::do_something()’ marked override, but does not override
     virtual void do_something() override { std::cout << "B::do_something\n"; }
                  ^
stdout
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Standard output is empty
https://ideone.com/xM2VtW
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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