> >> what's a "label" ? > > > > In your example, RED, GREEN, and BLUE. colours provides a mapping > > from values to labels/cases, and the switch statement provides a > > mapping from labels/cases to code. Sorry about introducing a new term > > without saying anything about it. > > yeah, but what are they? integers? strings? names without an associated value? Syntactically, they are bare words (names). They are constants, and compare equal to other identical labels. > how do you create new labels? To the programmer, all valid labels exist; you just use them. They are only used in very particular places in the grammar. Internally, they are probably represented by strings. > where are they stored? They are stored by the internal representation of any construct that uses them. That would be dispatch table objects and compiled switch statements. > who keeps track of them? Each construct keeps track of its own copies, and destroys them when they are no longer needed. -- Eric Sumner
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