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Peter wrote: >Which tells me that "technically" a prototype is _not_ required, it just >makes it easier to write the compiler. A multi-pass compiler could simply >flag the point where it found the function|procedure call, keep going until >it found the definition of the procedure, which includes the procedure >interface which has the same information as the prototype. It could then go >back and insert the code for the function|procedure call and make sure it's >being called with the correct parameters. Technically, the RPG IV compiler is a multi-pass compiler. This is necessary since you can generally define things after you first use them. Probably the main reason for the design of RPG prototypes was to encourage good modular programming practice. The technique we recommend is to place the exported procedure prototypes for a module in a separate /COPY member that is included in both the exporting module and all importing modules. This way, you can ensure consistency between callers and callee. No, it isn't easier for the compiler, since it has to verify that the prototypes (PR specs) for procedures match their corresponding procedure interfaces (PI specs). Cheers! Hans Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com +--- | This is the Midrange System Mailing List! | To submit a new message, send your mail to MIDRANGE-L@midrange.com. | To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com. | To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: david@midrange.com +---
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