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Tip of the Day
Language: C++
Expertise: Beginner
Apr 14, 2000

Understanding Member Function Lookup Rules

Function lookup stops at a scope. In the case of class hierarchies, this means that a function—either virtual or not—declared in a derived class can hide a virtual member function with the same name in its base class, even if the functions' signatures differ. For example:
 
 
  class B 
  {
  public: 
    virtual void f(int);
  };
  class D : public B 
  {
  public: 
    void f(void*);
  };

  D d ;
  d.f(7) //#1 compilation error

The statement d.f(7) is in error although class B has a function called f() which takes int. To see why this is an error, let

Danny Kalev
 
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