Walter Bright: > http://dobbscodetalk.com/index.php?option=com_myblog&show=Optimizing-Immutable-and-Purity.html&Itemid=29 Better link: http://dobbscodetalk.com/index.php?option=com_myblog&show=Optimizing-Immutable-and-Purity.html&Itemid=29 (Not read yet). Bye, bearophile