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Tip of the Day
Language: C++
Expertise: Advanced
Nov 6, 1999

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A Member Function Template may not be Virtual

A reader tried to declare a template as a virtual member function of a class. However, his compiler refused to compile the code. The reader wanted to know what he was doing wrong. The answer is simple: the ANSI/ISO Standard says (14.5.2 p 3): "A member function template shall not be virtual." For example:
    
  template <class T> struct A 
  {
    template <class C> virtual void f(C);   

/* error, virtual template function */ virtual void g(); // OK, g is not a template };
Danny Kalev
 
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