----boundary-LibPST-iamunique-559110509_-_-
Content-type: text/plain
Dear Sir
There used to be a few editorial errors in the Appendix B of the language
description. The description in the text used to be the correct reference.
We have decided to make a corrected document available to the BlackBox user
community through Patch.14.020321, which you can now retrieve from our Web
server via our patch distribution service.
All the best,
The BlackBox Supporters
> -----Original Message-----
> From: mcintosh{([at]})nowhere.xy
> Sent: Thursday, March 21, 2002 1:34 PM
> To: blackbox{([at]})nowhere.xy> Subject: Forward Declaration Syntax
>
>
> I ran the syntax from Appendix B: Syntax of Component Pascal through
> Coco. I think that there is a discrepancy between the Forward
> procedure declaration in the explanitory text and the syntax diagram.
> The compiler seems to require the version in the explanitory text.
>
> I wish that I had a current syntax to feed Coco.
>
> MODULE PrivAlm01TestForward;
> (* Test the compiler behavior on forward declarations. *)
> TYPE ReceiveRecord = POINTER TO RECORD END;
> PROCEDURE ^ (this:ReceiveRecord) Forward ( ):INTEGER, NEW;
> (*The NEW is the discrepancy *)
> PROCEDURE (this:ReceiveRecord) Forward ( ):INTEGER, NEW;
> BEGIN
> RETURN 42
> END Forward;
> END PrivAlm01TestForward.
>
>
> From the explanitory text.
>
> ProcedureHeading = PROCEDURE [Receiver] IdentDef
> [FormalParameters] MethAttributes.
> Receiver = "(" [VAR | IN] ident ":" ident ")".
> MethAttributes = ["," NEW] ["," (ABSTRACT | EMPTY | EXTENSIBLE)].
>
> ProcedureDeclaration = ProcedureHeading ";" [ ProcedureBody ident ].
> ProcedureHeading = PROCEDURE [Receiver] IdentDef
> [FormalParameters] MethAttributes.
> ProcedureBody = DeclarationSequence
> [BEGIN StatementSequence] END.
> DeclarationSequence = {CONST {ConstantDeclaration ";"} |
> TYPE {TypeDeclaration ";"} |
> VAR {VariableDeclaration ";"} }
> {ProcedureDeclaration ";" | ForwardDeclaration ";"}.
> ForwardDeclaration = PROCEDURE " ^ " [Receiver] IdentDef
> [FormalParameters] MethAttributes.
>
>
> From the syntax diagrams.
>
> ForwardDecl = PROCEDURE "^" [Receiver] IdentDef [FormalPars].
> ProcDecl = PROCEDURE [Receiver] IdentDef [FormalPars]
> ["," NEW] ["," (ABSTRACT | EMPTY | EXTENSIBLE)]
> [";" DeclSeq [BEGIN StatementSeq] END ident].
--------------------------------------------
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Received on Mon Mar 25 2002 - 12:50:52 UTC