6.8 Predefined data

Tutorial on SDL-88
Belina, Hogrefe (edits Reed)

The reader who is not familiar with ADTs may, after having read up to this point, get the impression that ADTs are quite complex and not easy to use. The specification with ADTs is a matter of getting used to it. The advantages result from the philosophy behind ADTs.

The use of ADTs becomes a little bit easier with the existence of predefined types. SDL offers a number of them which are supposed to be of general use:

	Boolean
	Character
	Charstring
	Integer
	Natural
	Real
	PId
	Duration
	Time

Furthermore, there are some predefined generators:

	String
	Array
	Powerset