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Re: Using the GNU GMP Library for Bignums in Emacs
From: |
Stefan Monnier |
Subject: |
Re: Using the GNU GMP Library for Bignums in Emacs |
Date: |
Mon, 09 Jul 2018 16:15:52 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
>> 2. What is (type-of 5)? Right now 'integer, but arguably perhaps
>> 'fixnum is correct. Gerd's branch did this.
> 'integer', for the same reason that (type-of 5) doesn't return
> 'natnum'. fixnum and natnum are both subtypes of integer, and the basic type
> is integer. The other ways of doing this would cause more trouble to
> user code.
I think it'd be wrong for (type-of 5) to return the same value as
(type-of <BIGNUM>), especially as long as `eq` doesn't treat bignum
the same as fixnums.
Also, for purposes of cl-generic's dispatch it'd be better for type-of
to return `natnum` or `fixnum` when applicable.
Grepping through Elisp code, `type-of` is very rarely used and it's even
more rare for those uses to depend on the value returned for small
integers, but I did find a few such cases, so it's indeed safer to just
keep returning `integer` for small integers (and probably some other value
for bignums, such as `bignum`).
Stefan
Re: Using the GNU GMP Library for Bignums in Emacs, Richard Stallman, 2018/07/07
Re: Using the GNU GMP Library for Bignums in Emacs, Tom Tromey, 2018/07/08
Re: Using the GNU GMP Library for Bignums in Emacs, Richard Stallman, 2018/07/08
Re: Using the GNU GMP Library for Bignums in Emacs, Tom Tromey, 2018/07/09
Re: Using the GNU GMP Library for Bignums in Emacs,
Stefan Monnier <=
Re: Using the GNU GMP Library for Bignums in Emacs, Paul Eggert, 2018/07/10
Re: Using the GNU GMP Library for Bignums in Emacs, Helmut Eller, 2018/07/10
Re: Using the GNU GMP Library for Bignums in Emacs, Paul Eggert, 2018/07/10
Re: Using the GNU GMP Library for Bignums in Emacs, Helmut Eller, 2018/07/10
Re: Using the GNU GMP Library for Bignums in Emacs, Stefan Monnier, 2018/07/10
Re: Using the GNU GMP Library for Bignums in Emacs, Helmut Eller, 2018/07/11