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  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. using namespace std;
  5.  
  6.     class BaseClass
  7.     {
  8.     public:
  9.         void foo() {
  10.              cout << "Before calling " << typeid(*this).name() << "::doFoo()"  << endl; 
  11.              doFoo(); 
  12.              cout << "After calling " << typeid(*this).name() << "::doFoo()"  << endl; 
  13.         }
  14.     protected:
  15.         virtual void doFoo() = 0;
  16.     };
  17.  
  18.     class DerivedClass: public BaseClass
  19.     {
  20.     protected: // or private, depends on use case
  21.         virtual void doFoo() {/*come impl*/}
  22.     };
  23.  
  24. int main() {
  25.     BaseClass * bp = new DerivedClass();
  26.     bp->foo();
  27.     delete bp;
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 3428KB
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Standard input is empty
stdout
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Before calling 12DerivedClass::doFoo()
After calling 12DerivedClass::doFoo()
https://ideone.com/AotMnP
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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