David Kastrup <d...@gnu.org> writes:

> Hi, I am wondering if I may compare pointers with < that have been
> created using different calls of malloc.
> The C standard does not allow this (inequalities are only allowed for
> pointers into the same structure) to allow for some cheapskate sort of
> comparison in segmented architectures.

Hmm... if you were to implement a set of pointers in such a way that
you can cheaply tell if an unknown pointer belongs to that set, you
would use a hashtable, keyed with something that is derived from the
value of the pointer casted to uintptr_t, I would think.  Is such a
use of ((uintptr_t)ptr) unallowed?  If it is allowed, comparing two
unrelated pointers after casting them to uintptr_t would equally be
valid, I would have to think.
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