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The Constraints Paragraph
The Constraints paragraph allows specification of properties of parameters of a parameterized
class, and therefore allows the use of methods or properties on data items whose type
is specified as that parameter.
General Format
Syntax Rules
- Parameter-name-1 must be a parameter of the class in which this Constraints paragraph is specified.
General Rules
- If the IMPLEMENTS phrase is specified, parameter-name-1 must be of a class that implements the interface interface-name-1.
- If the INHERITS phrase is specified, parameter-name-1 must inherit directly or indirectly from class-name-1.
- If the NEWABLE phrase is specified, the class of parameter-name-1 must include a constructor with no parameters.
- If VALUE TYPE or VALUETYPE is specified, the type of parameter-name-1 must be a value type. If REFERENCE TYPE is specified, the type of parameter-name-1 must be a reference type.
- Items whose type is specified as parameter-name-1 may be specified where an item of class class-name-1 or interface-name-1 is required.
- Items whose type is specified as parameter-name-1 have all the methods and properties of a class-name-1 and interface-name-1