[m-rev.] For review: pretty print c_pointers as addresses

[Ian MacLarty]

On Tue, Aug 15, 2006 at 06:21:53PM +1000, Mark Brown wrote:
> On 15-Aug-2006, Ralph Becket <rafe at csse.unimelb.edu.au> wrote:
> > Mark Brown, Monday, 14 August 2006:
> > > On 14-Aug-2006, Ralph Becket <rafe at csse.unimelb.edu.au> wrote:
> > > > +
> > > > +% This really should be impure...
> > > > +%
> > > > +:- func c_pointer_addr(T) = int.
> > > > +
> > > > +:- pragma foreign_proc("C",
> > > > +    c_pointer_addr(X::in) = (Addr::out),
> > > > +    [promise_pure, will_not_call_mercury, will_not_modify_trail],
> > > > +"
> > > > +    Addr = (MR_Integer) X;
> > > > +").
> > > 
> > > If something really should be impure, then don't promise that it is pure.
> > > But why should this function be impure?
> 
> I've just realised that the argument to this function can be _any_ type,
> not just c_pointer.  In that case, yes, this function is impure (and poorly
> named, might I add).
> 

Why can't it be cc_multi, instead of impure?

Ian.
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