From: darylew@googlemail.com   
      
   I'm thinking of making a stream based off a read-only sequence.  Only   
   one of the read methods of basic_streambuf may write: pbackfail.  This   
   method gets called for two reasons: (1) the stream-buffer is already at   
   the first input position or (2) the character to be written back differs   
   from what's already there.  It's a good thing that stream-buffer stops   
   before writing a different character, otherwise I'll be screwed using an   
   actually-immutable backing sequence (with const_cast).  Who came up with   
   that policy?  Was it from someone who had the same use-case I have?   
      
   (And did six different people come up with the method names?  Does the   
   public method have the prefix, or its protected virtual helper, or both?   
   Which prefixes should be used?  Which suffixes, if any, should be used?   
   How did some public/protected method pairs go without a common base-word?)   
      
   Daryle W.   
      
      
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