Implementation of PRePTagIFDEF

    This is a subclass of PRePTagCode which defines the IFDEF tag. It is similar to the IF tag but it just examines whether the specified PRePTag exists or not.

    Constructor:

    PRePTagIFDEF()
    names the tag "IFDEF"

    Methods:

    compile(Session)
    gets the first argument and checks if a tag with that name exists

    Related sites:
How the IFDEF Tag works
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