fixnums - Fixnum arithmetic
LIBRARY
(import (rnrs arithmetic fixnums))
DESCRIPTION
Every implementation must define its fixnum range as a
closed interval
[−2^(w−1), 2^(w−1)−1]
such that w is a (mathematical) integer w ≥ 24. Every
mathematical integer within an implementation’s fixnum
range must correspond to an exact integer object that is
representable within the implementation. A fixnum is an
exact integer object whose value lies within this fixnum
range.
Fixnum operations perform integer arithmetic on their
fixnum arguments, but raise an exception with condition
type
&implementation-restriction
if the result is not a fixnum.
IMPLEMENTATION NOTES
- GNU Guile
-
Guile runs generic arithmetic faster than fixnums. If the numbers are
of a certain width (e.g. 32-bit) then they should be to truncated
with
bitwise-and.
- IronScheme
-
IronScheme stores fixnums on the heap. Remember to not use eq?,
assq or memq on fixnums. (This applies to Scheme as such,
not just IronScheme).
STANDARDS
R6RS
SEE ALSO
fixnum-width(3scm)
AUTHORS
This page is part of the
scheme-manpages
project.
It includes materials from the RnRS documents.
More information can be found at
https://github.com/schemedoc/manpages/.
Markup created by unroff 1.0sc, March 04, 2023.