Mercurial > projects > ldc
diff tango/tango/util/collection/impl/DefaultComparator.d @ 132:1700239cab2e trunk
[svn r136] MAJOR UNSTABLE UPDATE!!!
Initial commit after moving to Tango instead of Phobos.
Lots of bugfixes...
This build is not suitable for most things.
author | lindquist |
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date | Fri, 11 Jan 2008 17:57:40 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tango/tango/util/collection/impl/DefaultComparator.d Fri Jan 11 17:57:40 2008 +0100 @@ -0,0 +1,55 @@ +/* + File: DefaultComparator.d + + Originally written by Doug Lea and released into the public domain. + Thanks for the assistance and support of Sun Microsystems Labs, Agorics + Inc, Loral, and everyone contributing, testing, and using this code. + + History: + Date Who What + 24Sep95 dl@cs.oswego.edu Create from tango.util.collection.d working file + +*/ + + +module tango.util.collection.impl.DefaultComparator; + +private import tango.util.collection.model.Comparator; + + +/** + * + * + * DefaultComparator provides a general-purpose but slow compare + * operation. + * + author: Doug Lea + * @version 0.93 + * + * <P> For an introduction to this package see <A HREF="index.html"> Overview </A>. +**/ + +public class DefaultComparator(T) : Comparator!(T) +{ + + /** + * Try various downcasts to find a basis for + * comparing two elements. If all else fails, just compare + * hashCodes(). This can be effective when you are + * using an ordered implementation data structure like trees, + * but don't really care about ordering. + * + * @param fst first argument + * @param snd second argument + * Returns: a negative number if fst is less than snd; a + * positive number if fst is greater than snd; else 0 + **/ + + public final int compare(T fst, T snd) + { + if (fst is snd) + return 0; + + return typeid(T).compare (&fst, &snd); + } +}