a3d66e46   
   From: schaub.johannes@googlemail.com   
      
   Am 09.05.2012 21:27, schrieb Peter:   
   > Hi Folks,   
   >   
   > given this typedef   
   >   
   > typedef bool (*on_hit_test_type)(widget_interactive *, point const*,   
   > bool *);   
   >   
   > and this member definition   
   >   
   > std::function   
   > on_hit_test;   
   >   
   > Is there a way to convert one to the other? (The typedef to the   
   > std::function template argument or the other way round)   
   >   
      
   The "on_hit_test_type" typedef names the type "T*", and the   
   "on_hit_test" variable is of type "std::function", so to express the   
   second using the first, you do   
      
       std::function::type>   
         on_hit_test;   
      
   To express the first using the second, do   
      
       template   
       struct first_arg;   
      
       template   
       struct first_arg<   
         std::function   
       > {   
         typedef T type;   
       };   
      
       typedef first_arg::type *   
         on_hit_test_type;   
      
   Hope this helps.   
      
      
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