From: kaba@nowhere.com   
      
   Hi,   
      
   In my understanding, the following is currently not allowed by the C++11   
   standard:   
      
   template    
   void f(A&&... a, B&&... b) {}   
      
   The problem is that the compiler can not know how to group the template   
   arguments into the template parameter packs. For example, using   
   conceptual grouping brackets (not initializer lists), f("key", 0) can be   
   grouped as f({}, {"key", 0}), f({"key"}, {0}), or f({"key", 0}, {}).   
      
   The questions I have are:   
   * is there, with C++14, a way to notify the compiler of the grouping of   
   the template argument packs, as above?   
   * if not, has anyone proposed this idea already?   
   * if not, can you see flaws in this idea?   
   * if not, would you consider it a good idea?   
      
   Here's an example problem: to use perfect forwarding to construct   
   in-place both the key and the value of an associative container.   
      
   Thanks in advance:)   
      
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