On Jan 15, 5:59 am, Laurent PETIT <laurent.pe...@gmail.com> wrote: > I would like to know, is there an essential reason for not having > stored the dependency graph as a hidden property of the graph ?
I'm not sure I understand your question. You can see the stored graph if you take the function returned by dg/make-dgraph and call it without any arguments. I consider that an implementation detail, though. The dependency graph returned by dg/make-graph is a closure rather than a data structure mainly to allow shortcut syntax for accessing and "setting" node values: (my-dgraph :my-node) is just a function call. So is (my-dgraph :my-node new-node-value). If my-dgraph was not a function, there would have to be a more verbose calling convention. (Reader macro support in Clojure would have taken away some of the verbosity.) > Do you have examples of where you see it interesting to use (and not > abuse :-) ) side effects in combination with eager/patient ? I just checked in a Swing usage example which uses side effects to update the UI (http://github.com/gcv/dgraph/blob/master/src/examples/ dgraph/swing.clj). Please let me know if it makes sense. I hope the concept is useful outside of just making Swing programming less agonizing, though. :) > Are there implicit hypothesis (not yet documented ? or maybe I > overlooked) on the types that can be used for the keys of the graph ? Not particularly, no. I have always used keywords, so they are best- tested. Even so, any type usable as a key in a normal Clojure map should work. If you find something not working with another type, definitely let me know, and I'll try to fix it. > For those of use who do not know cl cells, would it be easy to explain > in which area it differs ? Cells the Common Lisp library lets you put slots of CLOS objects on a dependency graph. Put another way, any slot in any CLOS object can become a node on the graph. The Clojure dgraph library isolates the entire dependency graph in a separate, immutable data structure. Clojure cannot readily adopt the Cells way of doing things, because it has no CLOS and no meta-object protocol. dgraph also tries to at allow and even encourage purely functional use, in spite of its usefulness in side-effect-ridden UI code. Cells is more imperative in nature. Thanks for your interest in dgraph!
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