Difference in multiple inheritance and multilevel inheritance: same method name ambiguity problem Post: 302816047

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Top Forums Programming Difference in multiple inheritance and multilevel inheritance: same method name ambiguity problem Post 302816047 by royalibrahim on Monday 3rd of June 2013 08:12:41 AM

06-03-2013

Registered User

Difference in multiple inheritance and multilevel inheritance: same method name ambiguity problem

Hi,

In multi-level inheritance:

Code:

class A { 
public:
   void fun() { cout << "A" << endl; }
};

class B : public A {
public:
   void fun() { cout << "A" << endl; }
};

class C : public B { };

int main() {
    C c;
    c.fun();  // Ans: A
}

In multiple inheritance:

Code:

class A {
public:
   void fun() { cout << "A" << endl; }
};

class B {
public:
   void fun() { cout << "B" << endl; }
};

class C : public A, public B { /* public: using B::fun; */ };

int main() {
    C c;
    c.fun(); // Error: request for member function is ambiguous // use:  c.A::fun();
}

I would like to know, why there is no ambiguous problem in the multi-level inheritance code (1st code) which is compiling and giving output perfectly when both the base classes are having the same function signature. Where as it is giving error in the multiple inheritance code (2nd code).

royalibrahim

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CAIROPSSURFACE(3)							 1							 CAIROPSSURFACE(3)

The CairoPsSurface class

INTRODUCTION

CLASS SYNOPSIS

       CairoPsSurface

       CairoPsSurfaceextends
       CairoSurface

       Methods

       o public CairoPsSurface::__construct (string  $file, float  $width, float  $height)

       o public void CairoPsSurface::dscBeginPageSetup (void  )

       o public void CairoPsSurface::dscBeginSetup (void  )

       o public void CairoPsSurface::dscComment (string  $comment)

       o public bool CairoPsSurface::getEps (void  )

       o publicstatic array CairoPsSurface::getLevels (void  )

       o publicstatic string CairoPsSurface::levelToString (int  $level)

       o public void CairoPsSurface::restrictToLevel (string  $level)

       o public void CairoPsSurface::setEps (string  $level)

       o public void CairoPsSurface::setSize (string  $width, string  $height)

       Inherited methods

       o public CairoSurface::__construct (void  )

       o public void CairoSurface::copyPage (void  )

       o public void CairoSurface::createSimilar (CairoSurface	$other, int  $content, string  $width, string  $height)

       o public void CairoSurface::finish (void  )

       o public void CairoSurface::flush (void	)

       o public int CairoSurface::getContent (void  )

       o public array CairoSurface::getDeviceOffset (void  )

       o public void CairoSurface::getFontOptions (void  )

       o public int CairoSurface::getType (void  )

       o public void CairoSurface::markDirty (void  )

       o public void CairoSurface::markDirtyRectangle (string  $x, string  $y, string  $width, string  $height)

       o public void CairoSurface::setDeviceOffset (string  $x, string	$y)

       o public void CairoSurface::setFallbackResolution (string  $x, string  $y)

       o public void CairoSurface::showPage (void  )

       o public int CairoSurface::status (void	)

       o public void CairoSurface::writeToPng (string  $file)

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