Note: If you use scala, escape analysis can be particularly helpful. The "pimp my library" pattern for extending classes involves creating wrapper objects, and

Note: If you use scala, escape analysis can be particularly helpful. The "pimp my library" pattern for extending classes involves creating wrapper objects, and these can often be optimized away. http://www.decodified.com/scala/2010/08/27/scala-rich-wrapping-performance.html http://www.decodified.com/scala/2010/08/27/scala-rich-wrappi... has more details