Re: [Boost-users] case insensitive less_than string comparison

18 Jul 2005


      "Pavol Droba"  wrote in message 
news:20050717105715.GM17311@lenin.felcer.sk...
...
On Sat, Jul 16, 2005 at 06:17:28PM -0500, Thore Karlsen wrote:
...
On Sat, 16 Jul 2005 18:46:33 +0200, Pavol Droba 
wrote:
...
...
...
But is_iequal only tests for equality, it doesn't provide an ordering of
the characters. He's looking for something like is_iless, which I think
would be a nice addition too string_algo.
I see. Sorry about that. Somehow I have overlooked this obvious aspect.
You are right, such a function can be usefull. I will add it (but it will 
have
to wait after the release)
Any thoughts on carrying this one step further. I've the case where I need 
not just case insensitivity, but more of an interleaved case sensitivity. 
For example using the following:

   int CompareInterleavedCaseChar( char a1, char a2 )
   {
           if( std::toupper(a1) < std::toupper(a2) ) return -1;
      else if( std::toupper(a2) < std::toupper(a1) ) return  1;
      else if(              a1  <              a2  ) return -1;
      else if(              a2  <              a1  ) return  1;
      else                                           return  0;
   }

results in the following ordering:

    ABCdef
    ABcDef
    AbcDef
    Abcdef

in other words A < a < B < b < C ...

Thanks,

Jeff Flinn