On Wed, May 4, 2011 at 10:27 AM, Tim Johnson <tjohn...@iwu.edu> wrote: > Hi everyone, > > I have a bunch of objects (all instances of the same class) which each hold a > Date. There is another singleton-style class which holds a Dictionary to > keep track of those objects, where the key is the Date and the value is the > object.
This is probably the most common way to do it. #allInstances is great for debugging, but I don't like using it for applications. > Or is something smart going on, where the Date actually only exists once, and > the key is internally some hash value, so my worry is misplaced? This is not the way I would say it, but I think this is what is going on. Each Date can be referenced from many places. The exact same object is both the value of your object's date field, and also the key in the dictionary. Dates are not copied unless you explicitly copy them. Assignment is not copying in Smalltalk. -Ralph Johnson _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
