From: jklowden@speakeasy.net   
      
   On Sun, 13 Apr 2014 13:51:55 CST   
   Daniel Krügler  wrote:   
      
   > you could change the instantiation to your needs, e.g. to   
   >   
   > make_pair   
   >   
   > or even more general   
   >   
   > make_pair   
      
   Yes, I could, but neither would compile in C++98.  We're in a   
   transition -- and will be for at least a year -- during which both   
   standards need to be supported.   
      
   Having looked further into this today, AFAICT:   
      
   1.  std::transform requires explicit instantiation of any templated   
       function argument.   
   2.  No explicit instantiation of make_pair is portable across   
       C++98 and C++11.   
      
   At least the second fact was known to the committee and to implementors   
   in 2010.   
      
   My impression is that because make_pair was invented for type   
   deduction, the lack of backward compatibility for explicit   
   instantiation was deemed unimportant.  It's not clear to me if the use   
   of make_pair in std algorithms was considered, or if in fact the   
   compiler is supposed to deduce template parameters in that case.   
      
   If 1 and 2 are true, color me both surprised and disappointed.  At   
   least a backwards-compatible name could exist with the old   
   signature, e.g.   
      
   	template    
   	pair   
   	lvalue_pair( const K& k, const V& v) { return make_pair(k,v); }   
      
   That would have permitted simple search-and-replace instead of   
   preprocessor magic or bespoke templates the world over.   
      
   > Your interprettaion is wrong. The problem is not related to the   
   > const-ness of the iterator (or its lack of), but due to the requested   
   > rvalue-character of the std::make_pair argument types.   
      
   Thank you for your answer, and for that clarification.  I had thought   
   perhaps we would need to add functions that return const_iterator.   
      
   Regards,   
      
   --jkl   
      
      
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