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Classes Item, Next, NonTerminal, StateItem and Terminal use a static
inserter() function to define the way the object is inserted into a
stream. These functions expect addresses of member functions defining a
particular insertion as their arguments.
In the class header files the members that define an insertion type are listed
immediately following the inserter() prototype.
Currently only the Terminal class supports a manipulator functionality for
these member functions, allowing a insertion mode-switch within a single
insertion statement.
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