From: 1czajnik@googlemail.com   
      
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   Hello,   
      
   If class B has a base or member of type A with an assignment operator   
   taking A by value, does it implie B's auto-generated move assignment is:   
   - deleted?   
   - defaulted?   
   - not present?   
      
   That is, should this sample print "copy" or "move"?   
      
      
   #include    
      
   struct A   
   {   
       A() = default;   
       A( A const& ) { std::cout << "copy" << std::endl; }   
       A( A&& ) { std::cout << "move" << std::endl; }   
       A& operator=( A ) { return *this; }   
   };   
      
   struct B   
   {   
       A a;   
   };   
      
   int main()   
   {   
       B x, y;   
       x = std::move(y);   
   }   
      
      
   For me it prints "copy" in GCC-4.7, and "move" in MinGW-4.8.   
      
   This question originated from [1], where Adam Wulkiewicz tested a   
   similar sample and from that I expect compilers he used to produce   
   "copy". Those compilers are:   
   GCC4.7, Clang3.2, MinGW 4.7, VS2010, VS2013   
      
   Regards,   
   Kris   
      
   [1] http://boost.2283326.n4.nabble.com/move-interest-the-pass-by   
   value-and-swap-idiom-and-explicit-copy-constructors-td4659419.html   
      
      
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