I agree with Martin. Modifying Coordinate values in-place is probably a bad idea, however I'm pretty sure I've been guilty. What I'm trying to figure out now, is a good way to find out where and how many times.
regards, Larry Becker On 6/25/07, Martin Davis <[EMAIL PROTECTED]> wrote: > > > Michaël Michaud wrote: > > > > @Martin : Please, can you explain what immutability means for > > coordinates. I see that x,y,z are public fields (and I remember I often > > changed them via small scripts, especially the z value). But may be I > > have no clear idea about immutability and its advantages. > > > > > > Well, it's pretty simple. If you have a tool that works by altering the > ordinate values in a Coordinate, and you are using the "interned > Coordinate" strategy, you are going to get bugs, since Geometrys will > change unexpectedly when their shared Coordinate values are changed by > someone else. > > The public x,y,z in Coordinate were originally there for efficiency > reasons. Probably a bad idea. In fact, Coordinate should have simply > been an interface. But too late to change now! However, an application > like JUMP should make it a blanket policy that Coordinate values should > never by changed. Any other policy leads to insanity, IMO. > > HTH - Martin > > -- > Martin Davis > Senior Technical Architect > Refractions Research, Inc. > (250) 383-3022 > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > -- http://amusingprogrammer.blogspot.com/ ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
