The Art of Assembly Language, 2nd Edition

5.19 Procedural Parameters

One place where procedure pointers are quite invaluable is in parameter lists. Selecting one of several procedures to call by passing the address of some procedure is a common operation. Therefore, HLA lets you declare procedure pointers as parameters.

There is nothing special about a procedure parameter declaration. It looks exactly like a procedure variable declaration except it appears within a parameter list rather than within a variable declaration section. The following are some typical procedure prototypes that demonstrate how to declare such parameters:

procedure p1( procparm: procedure ); forward;
     procedure p2( procparm: procedure( i:int32 ) ); forward;
     procedure p3( val procparm: procedure ); forward;

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