From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Xue Fuqiao <xfq.free@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: About string header
Date: Thu, 28 Feb 2013 08:47:54 -0500 [thread overview]
Message-ID: <jwva9qolfh8.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <20130228164942.67904f953de674f38ee25d02@gmail.com> (Xue Fuqiao's message of "Thu, 28 Feb 2013 16:49:42 +0800")
> What does the "string header" mean here? I had searched the manuals
> and source files in src/ but I didn't find anything useful.
Every string is made of 2 parts:
The first part is a "Lisp_String" struct of fixed size which holds:
- the size of the string (in bytes and in chars).
- a pointer to the string's text-properties (stored in an "intervals tree").
- a pointer to the second part.
The second part are the actual bytes of the string, which are stored
elsewhere (and can be relocated so as to compact the memory).
The "string header" is the first part.
Stefan
next prev parent reply other threads:[~2013-02-28 13:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-28 8:49 About string header Xue Fuqiao
2013-02-28 13:47 ` Stefan Monnier [this message]
2013-02-28 14:02 ` Xue Fuqiao
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