Re: A curiosity...

[Adam Beneschan <adam@irvine.com>]

On Dec 5, 12:20 pm, Keith Thompson <ks...@mib.org> wrote:
> Hyman Rosen <hyro...@mail.com> writes:
> > Keith Thompson wrote:
> >> Except that there's no guarantee in C that converting an int to void*
> >> and back again will yield the original int value.
>
> > There's a guarantee in your implementation's documentation.
>
> Maybe.  The result of converting an integer to a pointer type, or vice
> versa, is implementation-defined, which means the implementation must
> document it.  It's not at all clear what level of detail is required,
> but you can *probably* determine whether it works the way you want.
> Which it might not.

This thread started with a comment about a tutorial that showed
students the "right" way to accomplish a certain task.  What do you
want to bet that this tutorial didn't say "This works only for such-
and-such implementations", nor "Check your implementation's
documentation to make sure the size of the pointer and integer are the
same"---but rather, that it presented its solution as if this were the
right solution with no regard for the particular implementation, host,
or target?  And students are learning to program from resources like
this.

                                 -- Adam