On Sun, 24 Sep 2017 12:37 pm, Bill wrote: >> For example, if I made "Pass-By-Reference Python" where all argument passing >> was done by reference, my language would differ from real Python: >> >> >> function(x, y) # allowed >> function(namespace.x, module.y) # allowed >> function(x + 1, 2) # FORBIDDEN: can't pass expressions or constants > > This would be okay as long as x + 1 evaluates to an object, no?
Not in Pascal, no. (Pascal pre-dated objects, but by the 80s there were various forms of Pascal with objects.) Pascal requires that the actual argument passed to the var parameter be an actual variable, not a constant or expression. Technically, it must be a "L-value", something which can appear on the left hand side of an assignment and therefore something that has an address. -- Steve “Cheer up,” they said, “things could be worse.” So I cheered up, and sure enough, things got worse. -- https://mail.python.org/mailman/listinfo/python-list
