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From: Matthias Kaeppler (nospam_at_[hidden])
Date: 2005-07-16 08:02:11


I am aware that string_algo has an if_iequal functor. Is there also an
equivalent for a less-than comparison? I have to compare strings
ignoring the case but taking locales into account.
Right now I'm calling boost::algorithm::to_lower on two copies of the
original strings. I'm not so sure if this is very efficient when I'm
comparing thousands of strings.

Here's the functor as it is now:

     struct FileLessNameA
         : std::binary_function<const File&,const File&,bool> {
         bool operator() (const File& lhs, const File& rhs) const {
             std::string path1( lhs.get_name().c_str() );
             std::string path2( rhs.get_name().c_str() );
             boost::algorithm::to_lower( path1 );
             boost::algorithm::to_lower( path2 );
             return path1 < path2;

Any suggestions for improvements appreciated :)


Matthias Kaeppler

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