From: daniel.kruegler@googlemail.com   
      
   Am 24.09.2011 12:48, schrieb Daniel Krügler:   
   > Am 23.09.2011 21:03, schrieb Thiago Adams:   
   >> Hi,   
   >>   
   >> I understand that the types shared_ptr and shared_ptr   
   >> are independent types.   
   >   
   > It is of little importance, whether both types are independent or not   
   > for the question that you are asking here (at least if I understand your   
   > question correctly). It seems to me that you want to reinterpret a   
   > reference or a pointer to shared_ptr as shared_ptr. This   
   > requires a property called "layout-compatible", see 9.2 p19+20:   
      
   I must correct me here: Layout-compatible is not sufficient in C++ (I   
   think it is sufficient in C), the provided guarantees are not sufficient   
   for your purpose. We would need 3.10 p10 ("If a program attempts to   
   access the stored value of an object through a glvalue of other than one   
   of the following types[..]") for this purpose. But the bulleted list   
   does not fit to shared_ptr versus shared_ptr. This means my   
   assumed hesitation about implementors providing this guarantee could be   
   worse as I described.   
      
   I apologize for any confusion,   
      
   Daniel Krügler   
      
      
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