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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: |
Tue, 10 Jul 2018 23:42:28 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
> subr and compiled-functions are distinct (nonintersecting) types, whereas
> bignum is a subset of integer, so these are quite different cases. The
> manual says "each object belongs to one and only one primitive type;
> ‘type-of’ tells you which one". But if type-of returned 'integer' and
> bignums are integers (which they should be), this statement in the manual
> would become false, and would need to be rewritten. I don't see this
> as a win.
Actually, the incorrect statement would be when (type-of 5) returns
`integer` since `integer` wouldn't be a primitive type any more.
> True, it's pretty rare. And it is a relic of the old-fashioned days when
> types were all disjoint. (Maybe we should remove 'type-of'? :-)
FWIW, I dislike type-of and would be happy to get rid of it (and
replace it with a cl-generic-specific function instead which would fix
some of its shortcomings for that use-case).
> I'm not all that worried about type-of. I am more worried about the idea
> that bignums are second-class integers. When at all possible, bignums should
> be treated the same way that any other (large) integer is treated.
Fully agreed. I just see `type-of` as a function that reports about the
actual representation so it's OK for it to reveal differences which will
rarely affect normal code.
Stefan
- Re: Using the GNU GMP Library for Bignums in Emacs, (continued)
- Re: Using the GNU GMP Library for Bignums in Emacs, Tom Tromey, 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, Stefan Monnier, 2018/07/10
- Re: Using the GNU GMP Library for Bignums in Emacs, Tom Tromey, 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, Stefan Monnier, 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,
Stefan Monnier <=
- Re: Using the GNU GMP Library for Bignums in Emacs, Richard Stallman, 2018/07/11
- Re: Using the GNU GMP Library for Bignums in Emacs, Tom Tromey, 2018/07/12
- Re: Using the GNU GMP Library for Bignums in Emacs, Richard Stallman, 2018/07/12
- Re: Using the GNU GMP Library for Bignums in Emacs, Stefan Monnier, 2018/07/15
- Re: Using the GNU GMP Library for Bignums in Emacs, Paul Eggert, 2018/07/18
- Re: Using the GNU GMP Library for Bignums in Emacs, Stefan Monnier, 2018/07/18
- Making 'eq' == 'eql' in bignum branch, Paul Eggert, 2018/07/27
- Re: Making 'eq' == 'eql' in bignum branch, Stefan Monnier, 2018/07/28
- Re: Making 'eq' == 'eql' in bignum branch, Paul Eggert, 2018/07/28
- Re: Making 'eq' == 'eql' in bignum branch, Stefan Monnier, 2018/07/29