[BLACKBOX] Sorting Extended Records

From: Stephen R. Troy <"Stephen>
Date: Mon, 28 Mar 2011 09:49:19 -0700

----boundary-LibPST-iamunique-1971002845_-_- Content-type: text/plain OK, I'm back again with the same question I had almost two years ago. In addition to the BlackBox Component Pascal documentation, at the recommendation of this list I have gone away and read "Object-Oriented Programming in Oberon-2" by Hanspeter Mössenböck. I also read "Computing Fundamentals: The Theory and Practice of Software Design with BlackBox Component Pascal" by J. Stanley Warford, which I found especially helpful because it covers operational detail that I could not find in the BlackBox documentation. I have a database which is a single large flat ASCII file, built using a schema which is not under my control. I want to read and parse this file (which is no problem), and from it generate records that I can manipulate to generate reports. I want to store the records in binary trees for efficiency in searching and sorting. There are three types of records, and so three binary trees. The three record types have several fields in common, one of which is a unique alphanumeric label, and then each type has several unique fields. When I wrote an earlier version of this program in Modula-2, I was able to use variant records. This let me write single routines to build the binary trees, level them, and sort them, which would work for all three types of records. But variant records are not allowed in Component Pascal. In Component Pascal I wrote the common part of the records as an Extensible (base) record type, and then each of the three record types as extensions of that base type. I refer to each of the three binary trees by a root variable which is a pointer to the corresponding extended record type. I can write a single routine using pointers to the base Type to sort each tree, and to balance each tree, because Component Pascal allows assigning the value of a pointer to an extended record, to the pointer to a base record. HOWEVER, in general sorting and balancing a binary tree causes the root to change, and Component Pascal will not allow assigning the value of a pointer to a base record, back to a pointer to an extended record. Apparently this means I have to include three separate but nearly-identical versions of the sorting routine, one for each extended record type, which seems incredibly ugly, inefficient, and error-prone. I am having trouble seeing how this "feature" of BlackBox Component Pascal is an improvement. Has anybody found a way to handle this issue? Any suggestions would be much appreciated. Steve Troy ---- To unsubscribe, send a message with body "SIGNOFF BLACKBOX" to LISTSERV{([at]})nowhere.xy ----boundary-LibPST-iamunique-1971002845_-_- Content-type: application/rtf Content-transfer-encoding: base64 Content-Disposition: attachment; filename="rtf-body.rtf" e1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcZnJvbWh0bWwxIFxkZWZmMHtcZm9udHRibA0Ke1xmMFxm c3dpc3NcZmNoYXJzZXQwIEFyaWFsO30NCntcZjFcZm1vZGVybiBDb3VyaWVyIE5ldzt9DQp7XGYy XGZuaWxcZmNoYXJzZXQyIFN5bWJvbDt9DQp7XGYzXGZtb2Rlcm5cZmNoYXJzZXQwIENvdXJpZXIg TmV3O319DQp7XGNvbG9ydGJsXHJlZDBcZ3JlZW4wXGJsdWUwO1xyZWQwXGdyZWVuMFxibHVlMjU1 O30NClx1YzFccGFyZFxwbGFpblxkZWZ0YWIzNjAgXGYwXGZzMjQgDQp7XCpcaHRtbHRhZzE5IDxo dG1sPn0NCntcKlxodG1sdGFnNTAgPGJvZHk+fXtcKlxodG1sdGFnNjR9XGh0bWxydGYge1xodG1s cnRmMCANCntcKlxodG1sdGFnODQgPHNwYW4gc3R5bGU9ImZvbnQtZmFtaWx5OlZlcmRhbmE7IGNv bG9yOiMwMDAwMDA7IGZvbnQtc2l6ZToxMHB0OyI+fVxodG1scnRmIHtcaHRtbHJ0ZjAgXGh0bWxy dGYgfVxodG1scnRmMCB7XCpcaHRtbHRhZzcyfVxodG1scnRmfVxodG1scnRmMA0KDQp7XCpcaHRt 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