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Create classes whose instances have tracked methods

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Create classes whose instances have tracked methods

spectate is useful for remotely tracking how an instance is modified. This means that protocols for managing updates, don’t need to be the outward responsibility of a user, and can instead be done automagically in the background.

For example, if it were desirable to keep track of element changes in a list, spectate could be used to observe list.__setitiem__ in order to be notified when a user sets the value of an element in the list. To do this, we would first create an elist type using expose_as, construct an instance of that type, and then store callback pairs to that instance’s spectator. To access a spectator, register one with watch (e.g. spectator = watch(the_elist)), retrieve a preexisting one with the watcher function. Callback pairs are stored by calling the watcher(the_list).callback method. You can then specify, with keywords, whether the callback should be triggered before, and/or or after a given method is called - hereafter refered to as “beforebacks” and “afterbacks” respectively.

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