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TYPE
The TYPE attribute specifies a prototype that does not reference an actual PROCEDURE. Instead, it defines a prototype name to use in other prototypes to indicate the type of procedure passed to another PROCEDURE as a parameter.
When the name of the TYPEd prototype is used in the parameter list of another prototype, the procedure being prototyped will receive, as a passed parameter, the label of a PROCEDURE that has the same type of parameter list (and has the same return type, if it returns a value).
Example:
MAP
ProcType PROCEDURE(FILE),TYPE !Procedure-parameter type definition
MyFunc3 PROCEDURE(ProcType),STRING !ProcType procedure-parameter, returning a STRING,
END ! must be passed the label of a procedure that
!takes a FILE as a required parameter
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