From: musiphil@bawi.org   
      
   On 2013-02-28 04:16, omveer wrote:   
   > Thanks to Tobias Müller. I got below response.   
   >   
   [...]   
   >   
   > Consider the following case:   
   >   
   > class A   
   > {   
   > public:   
   >      A();   
   >      A(int i);   
   > };   
   >   
   > class B : virtual public A   
   > {   
   > public:   
   >      B() : A() {}   
   > };   
   >   
   > class C : virtual public A   
   > {   
   > public:   
   >      C() : A(4) {}   
   > };   
   >   
   > class D : public B, public C   
   > {   
   > public:   
   >      // D() : B(), C() {}      // -> Error, the A subobject   
   >                                  // is the same for B and C   
   >                                  // and can only be   
   >                                  // constructed once. But use   
   >                                  // A() or A(4)?   
      
   This is not an error, because it needs to construct A and the default   
   constructor of A is accessible from D. It doesn't matter how the c'tors   
   of B and C are defined to construct A; they are simply ignored.   
      
   >      D() : A(), B(), C() {}  // Correct   
      
   This is identical to the previous constructor (commented out).   
      
   > };   
      
   --   
   Seungbeom Kim   
      
      
         [ See http://www.gotw.ca/resources/clcm.htm for info about ]   
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