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This object clears the branch stack when it is executed. The branch stack
is used for memorizing non parallel branches which are still to be executed.
Fig. 1: Functionality
The basic functionality is demonstrated in Fig. 1. At the branching
the non-parallel sub branch is executed first and the execution of the other
branch is memorized in the branch stack. The cut object clears the
branch stack and so the other calculator object is never executed.
What can this be used for? A usage example is given in Fig. 2.
Fig. 2: Usage
Here depending on a condition two different calculator objects are executed
within an endless loop. To prohibit the creation of an additional thread
and wast cpu time the yes and no objects are connected with the condition
via non-parallel sub branches. In this case it is not known, which of the
two branches is executed first. As it is an endless loop, branches, which
are memorized for execution may not be executed as the current branch never
terminates. Therefore the branch stack may grow infinitely. Therefore
the cut object can be used to clear the branch stack before the loop is executed
again. The alternative way would be to use parallel branches to connect the
yes / no objects.