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Re: Copying one Lisp_Object to another in C code?

From: Andreas Schwab
Subject: Re: Copying one Lisp_Object to another in C code?
Date: Fri, 02 Jul 2010 11:06:32 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)

James Cloos <address@hidden> writes:

> Given:
>     static void (foo)
>         Lisp_Object foo;
>     {
>         Lisp_Object bar;
>     /* etc */
> is it OK to do:
>         bar = foo;
> or is there a function or macro one should call?

Lisp_Object values are just references (except for Lisp_Int values),
so they can be freely copied around.

> I presume GCPRO1 (foo) is in order either way?

Only if you reference a Lisp object that is not already protected from
elsewhere.  For example, all argument values of built-ins are implicitly


Andreas Schwab, address@hidden
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