> bool operator()( const string& x, const string& y) const
> {
> return your ordering;
> }
Where your ordering can be written as
std::lexicographical_compare
( x.begin() , x.end() , y.begin() , y.end() , ICAOcode_char_lt() )
where ICAOcode_char_lt implements the ``less than'' relation for the
individual characters for your ICAO codes:
struct ICAOcode_char_lt {
bool operator()( char const x , char const y ) const {
// Numbers come after letters:
if( std::isalpha( x ) && std::isdigit( y ) ) { return true ; }
// Upper-case only comparison:
return std::toupper( x ) < std::toupper( y ) ;
}
} ;
(hope this relation is transitive---please check!)
Cheers
-Gerhard
--
Gerhard Wesp o o Tel.: +41 (0) 43 5347636
Bachtobelstrasse 56 | http://www.cosy.sbg.ac.at/~gwesp/
CH-8045 Zuerich \_/ See homepage for email address!
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