From: musiphil@bawi.org   
      
   On 2012-05-08 11:31, Andy Lutomirski wrote:   
   > On 05/07/2012 07:41 PM, nroberts wrote:   
   >>   
   >> foo f = foo();   
   >>   
   >> new (&f) foo(f);   
   >>   
   >> As I understand it, this will try to recreate f on top of itself with   
   >> itself.   
   >   
   > It looks rather similar to this:   
   >   
   > #include    
   >   
   > int main()   
   > {   
   >    std::string x(x);   
   >    return 0;   
   > }   
      
   [I don't think you claimed the cases were the same, but anyway...]   
   The two cases are different. The emphasis for the OP's case is on   
   overwriting the storage for an already-existing object, since it's   
   perfectly fine to read from an already-existing object. The emphasis   
   for your case should be on reading from a not-yet-constructed object.   
      
   'T t(t);' in general could be defined or undefined, depending on what   
   the matching constructor does: it can use the argument only in a very   
   limited way, such as taking the address.   
      
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