🚀 go-pugleaf

>In article <1993Jan23.181029.29389@uvm.edu> wollman@sadye.emba.uvm.edu (Garrett Wollman) writes:
>
>The ANSI C standard
>*does* guarantee (I believe, not having a copy handy) that there is
>some flavor of integer that can be cast back and forth to a pointer
>type. 

Not quite.  It is legal to cast an integer value to a pointer type,
and legal to cast a pointer value to an integer type.  The results
are implementation-defined, which means that such code is not portable.

Further, it is not guaranteed that there exists an integer type which
is large enough to contain all the bits in a pointer.  For example,
implementations with 48-bit pointers and 32-bit longs exist, and
are allowed by the C Standard.  Similarly, there are implementations
where pointers cannot contain all possible integer values, and this
is also allowed.

Implementations commonly allow casting back and forth between ints
(or longs) and pointers, but you have to check the compiler manual
to see what is actually supported.
-- 

Steve Clamage, TauMetric Corp, steve@taumet.com