4ffa570d   
   From: luto@amacapital.net   
      
   On 05/07/2012 07:41 PM, nroberts wrote:   
   > Someone asked a question with some really deranged code and I'm unable   
   > to find something in the standard that would indicate whether this   
   > would be defined or not:   
   >   
   > struct foo; // let's talk the generic case here.  If there are   
   > specifics please explain   
   >   
   > foo f = foo();   
   >   
   > new (&f) foo(f);   
   >   
   > As I understand it, this will try to recreate f on top of itself with   
   > itself.   
   >   
   > My instinct says that this is likely undefined and in some cases is   
   > going to do absolutely absurd stuff...   
   >   
   >   
      
   It looks rather similar to this:   
      
   #include    
      
   int main()   
   {   
      std::string x(x);   
      return 0;   
   }   
      
   gcc and clang will cheerfully compile this without warnings, but it   
   (unsurprisingly) crashes at runtime.   
      
   Yes, I typed something like this by accident once while refactoring.   
      
   --Andy   
      
      
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