introduce transition predicates #42
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the transition will fire only iff predicate returns true. Default is true.
a transition guarded with a predicate will only fire if the predicate returns true. In this example, transitions will start firing only after 5s post startup.
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a transition or timed transition may optionally be guarded by a predicate. The transition will fire only if the evaluation of the predicate returns true.
The using_predicates example shows how to dynamically enable/disable transitions at runtime.