From: darylew@googlemail.com   
      
   On Tuesday, April 30, 2013 3:48:42 PM UTC-4, Daryle Walker wrote:   
   > I've read about people wondering how to do:   
   >   
   > MyClass   
   > {   
   > public:   
   >     //...   
   >     void  swap( MyClass & ) noexcept( /*What goes here?*/ );   
   >     //...   
   > };   
   [SNIP]   
   > Is this viable?  Is there an easier alternative?   
      
   Why yes, yes there is.  I came up with it just after the first post.   
   We just combine "constexpr" with implementations on using ADL-swap:   
      
       #include    
      
       template < typename T >   
       inline constexpr   
       bool  is_swap_noexcept() noexcept   
       {   
           using std::swap;   
           return noexcept( swap(std::declval(),   
            std::declval()) );   
       }   
      
       // Example   
       template < typename T >   
       void  adl_swap( T &a, T &b ) noexcept( is_swap_noexcept() )   
       {   
           using std::swap;   
           swap( a, b );   
       }   
      
   No magic, or hoping of, needed.   
      
   Daryle W.   
      
      
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