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From: Aaron Bartel
Does RPG make a good "plumbing" or "framework base" type language?
Service programs make good toolkits. And after you've written a dozen or so service programs you're beginning to have a good "framework".
Barbara Morris of the Toronto compiler team also showed me a technique for implementing object oriented concepts using RPG, which I've used a lot.
For example, I use a generic service program to support combo boxes. The cboNew() procedure returns a pointer to a new instance of a combo box. The cboAddItem() procedure adds new items to a combo box. The cboToHTML() procedure renders a combo box as an HTML stream. And so forth.
While object instantiation is more common in object oriented languages, it's pretty easy to do in RPG, using data structures with basing pointers and %alloc(), where data structure subfields are used to store object properties.
Nathan.
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