Some language purists claim that the messages are an intrinsic part of object-oriented programming. Check the documentation for Concurrency or for the REPLY instruction for some context.
I always thought that object-oriented programming started with Simula 67 by way of Smalltalk, but according to wiki some of the concepts go back toDoug Ross's Automated Engineering Design/Algol Extended for Design. (AED). * <https://en.wikipedia.org/wiki/Douglas_T._Ross#Computer-aided_design> * <https://en.wikipedia.org/wiki/Object-oriented_design> * <https://en.wikipedia.org/wiki/Object-oriented_programming> * <https://en.wikipedia.org/wiki/Simula> * <https://en.wikipedia.org/wiki/Smalltalk#Messages> -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Bob Bridges [robhbrid...@gmail.com] Sent: Friday, January 7, 2022 10:16 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Macro/script/program (Re: ... Re: Top 8 Reasons for using Python instead of REXX for z/OS When I first started learning ooREXX (not that long ago, and I still don't know it well) I read that bit about "messages" that are apparently sent to methods and properties and was confused. My only object-oriented language at the time was VB (the VBA and VBS varieties), and I thought of methods as merely specialized function calls. Really I still do, I guess. I told myself provisionally that the tilde in ooREXX is simply the equivalent of the period in a VBA method or property reference, and although I'm pretty sure that isn't the whole story I was at least able to continue on that basis. I keep reading descriptions like the below, though, thinking that more will sink in eventually. --- Bob Bridges, robhbrid...@gmail.com, cell 336 382-7313 /* This sad little lizard told me that he was a brontosaurus on his mother's side. I did not laugh; people who boast of ancestry often have little else to sustain them. Humoring them costs nothing and adds to happiness in a world in which happiness is always in short supply. -from the Notebooks of Lazarus Long */ -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Rony G. Flatscher Sent: Friday, January 7, 2022 07:57 * The tilde (~) is the ooRexx message operator; one can send messages to any value/object/instance in an ooRexx program. Left of the tilde is the receiving value/object/instance/receiver (these are synonyms), right of it the name of a method routine that conceptually the receiver is supposed to look up and invoke on behalf of the programmer. If the invoked method routine returns a result one can immediately send it a message too, if needed. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
