Re: Using (SCM)0

[Marius Vollmer]

Ludovic Courtès <address@hidden> writes:

> Is there anything wrong with using (SCM)0 as a "special value" in C
> code?  In other words, is it possible for a "real" SCM object to be
> equal to zero, in which case I'd better use SCM_UNDEFINED or some such?

Yes.  (SCM)0 will be interpreted as a pointer to a cell at address 0,
which will segfault.

You need to be careful with SCM_UNDEFINED as well.  I must _never_
reach Scheme code.  I.e., you can't put it into pairs, vectors, etc.

-- 
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3  331E FAF8 226A D5D4 E405