From: jklowden@speakeasy.net   
      
   On Sat, 13 Jul 2013 01:26:13 -0700 (PDT)   
   frank67x@googlemail.com wrote:   
      
   > i was looking for some std::string alike, which just handles   
   > everything in lower case (actually as there is only one opposite -   
   > upper case - it's about a case insensitive string class).   
      
   Here's a koan for you: case sensitivity isn't a property of the   
   string.   
      
   For a proof, consider two strings   
      
   	scs, case-sensitive   
   	sci, case-insensitive   
      
   and ask what is the meaning of   
      
   	scs == sci   
      
   The "meaning" is defined by operator== and nothing else.  The operator   
   may look for hints in its operands; they might have a flag that says   
   "treat as case-[in]sensitive", but the operator is free to honor or   
   ignore the flag, and determines what to do if the flags are in   
   contradiction.   
      
   Contrast that with a bona fide string property, e.g. its   
   encoding. It's impossible to know what characters are represented by   
   the bytes in the string without knowing the encoding. Two strings of   
   different encodings can be meaningfully compared only if both   
   encodings are known; operator== can't return a meaningful result   
   without that information.   
      
   --jkl   
      
      
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