From: lichray@googlemail.com   
      
   On Wednesday, November 21, 2012 2:42:26 PM UTC-6, Daniel Krügler wrote:   
   > I'm not sure whether I understood your question correctly, because you   
   > mention (a) the ability to work on just a type and (b) you refer to   
   > is_swapable (instead of is_nothrow_swapable). I guess that (b) is just a   
   > thinko on your side. What about a variation of your constexpr function   
      
   The reason I tried to mix those two tests is that, I found some swap()   
   member functions are not declared as noexcept in gcc-4.7, so I wanted   
   to bypass it.  But latter I found that in gcc-4.8, these classes are   
   really not non-throw swappable, so I switched to an exception-   
   transparency design of my own swap() functions.   
      
   Thank you, the people who replied me.  std::declval is really helpful,   
   since gcc does not support `this' in the noexcept operator and   
   trailing return type :(   
      
      
   --   
         [ See http://www.gotw.ca/resources/clcm.htm for info about ]   
         [ comp.lang.c++.moderated.    First time posters: Do this! ]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)