Begin declataion of a queue class.
Begin declataion of a queue class. This macro is used to declare a descendent of PAbstractList class, customised for a particular object type T, and adds functionality that allows the list to be used as a first in first out queue.If the compilation is using templates then this macro produces a descendent of the PQueue template class. If templates are not being used then the macro defines a set of inline functions to do all casting of types. The resultant classes have an identical set of functions in either case.
See the PQueue and PAbstractList classes for more information.
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