Reply to thread

Message: [QUOTE="Oliver Wong, post: 2984305"] There's no hard and fast rule, but as a rule of thumb, in this situation you would use the least general type which is a supertype of all the possible types you might get from your FIFO queue. The issue is that you will probably want to do something with each element you take out of the queue. Usually, to "do something" involves invoking a method. Which means the method you want to invoke must be part of the type of the reference (or you could use casting, but that gets messy). So say if you wanted to call the .doSomething() method on each element, the type of the reference would need to be such that the ..doSomething() method is defined on that type. If the .doSomething() method is defined in Symbol, then use Symbol as the type of the reference. If the method is defined in Evaluate, then use Evaluate. If it's defined in both, then it doesn't matter too much which one you use. - Oliver [/QUOTE]