Re: Copying one Lisp_Object to another in C code?

[Andreas Schwab]

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
protected.

Andreas.

-- 
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."