Joachim Durchholz <[EMAIL PROTECTED]> wrote:
+---------------
| INSERT cannot be expressed in terms of assignment. INSERT creates a new
| record; there's no way that assignment in a language like C can create a
| new data structure! The same goes for DELETE.
+---------------
Well, what about "malloc()" & "free()"? I mean, if your
"database" is a simple linked list, then INSERT is just:
ROW *p = malloc(sizeof *p);
p->field1 = value1;
p->field2 = value2;
...
p->fieldN = valueN;
database = cons(p, database); /* Common Lisp's CONS */
and DELETE is just:
ROW *p = find_if(predicate_function, database); /* CL's FIND-IF */
database = delete(p, database); /* CL's DELETE */
free(p);
[There are single-pass methods, of course, but...]
-Rob
-----
Rob Warnock <[EMAIL PROTECTED]>
627 26th Avenue <URL:http://rpw3.org/>
San Mateo, CA 94403 (650)572-2607
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