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Re: Type-error in C code

From: Jan Djärv
Subject: Re: Type-error in C code
Date: Sat, 13 Nov 2010 20:19:05 +0100
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv: Gecko/20101013 Thunderbird/3.1.5

Thien-Thi Nguyen skrev 2010-11-12 22.15:
() Jan Djärv<address@hidden>
() Fri, 12 Nov 2010 16:12:17 +0100

    An Atom is 32 bits.

... with the top 3 bits guaranteed to be zero
(X Windows System Protocol, section 3. Common Types).

In this Emacs, ‘most-positive-fixnum’ is 536870911,
i.e., #x1fffffff, i.e., 29 1s.


Interesting. Maybe they used those bits as a type indictor at one point. Looking at the X source now, I can't find any reson for this.

However, I fixed the code to use make_fixnum_or_float anyway. In the future somebody may come along and wonder why a 32-bit number is put in a Lisp integer.

        Jan D.

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