From: bop@gmb.dk   
      
   marcel.loose@googlemail.com skrev 2014-04-17 14:26:   
   > Hi all,   
   >   
   > I bumped into a compilation error with GCC 4.8 with the following code:   
   >   
   > $ cat t.cc   
   > class B   
   > {   
   > protected:   
   >    struct S {};   
   >    virtual void doIt(struct S& s) = 0;   
   > };   
   >   
   > class D : public B   
   > {   
   > public:   
   >    using B::S;   
   >    virtual void doIt(struct S& s);   
   > };   
   >   
   > void D::doIt(struct S& s)   
   > {   
   >    (void)s;   
   > }   
   >   
   > $ g++ -Wall -Wextra -Woverloaded-virtual -c t.cc   
   > t.cc:5:16: warning: 'virtual void B::doIt(B::S&)' was hidden   
   > [-Woverloaded-virtual]   
   >     virtual void doIt(struct S& s) = 0;   
   >                  ^   
   > t.cc:12:16: warning:   by 'virtual void D::doIt(S&)'   
   [-Woverloaded-virtual]   
   >     virtual void doIt(struct S& s);   
   >                  ^   
   > t.cc:15:6: error: prototype for 'void D::doIt(B::S&)' does not match any   
   in   
   > class 'D'   
   >   void D::doIt(struct S& s)   
   >        ^   
   > t.cc:12:16: error: candidate is: virtual void D::doIt(S&)   
   >     virtual void doIt(struct S& s);   
   >                  ^   
   >   
   > When I remove struct in the declaration of doIt(), everything compiles   
   fine.   
   > What's going on here?   
   >   
      
   The function declaration is an inner scope in the class declaration.   
   The compiler believes you are declaring another struct S in this inner   
   scope.   
      
   This is similar to a forward declaration of a class   
      
   class X;   
      
      
   Bo Persson   
      
      
      
      
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