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Re: Common Lisp solved this problem 20 years ago

This page is part of the web mail archives of SRFI 77 from before July 7th, 2015. The new archives for SRFI 77 contain all messages, not just those from before July 7th, 2015.



Marcin 'Qrczak' Kowalczyk wrote:
Declaring types of identifiers is not enough, because it can't express
the wish to ignore any fixnum overflow and assume that the result will
fit in a fixnum.

Indeed, the current SRFI does not adequately distinguish between the following two cases:

(a) addition in which the operands are fixnums and the result is guaranteed to be a fixnum (or should be wrapped to a fixnum's range).

(b) addition in which the operands are fixnums and the result is not guaranteed to be a fixnum (and should not be wrapped to a fixnum's range).

Regards,

Alan
--
Dr Alan Watson
Centro de Radioastronomía y Astrofísica
Universidad Astronómico Nacional de México