Re: [PATCH] [RFC] RAII auto_mpfr and autp_mpz

[Jakub Jelinek <jakub@redhat.com>]

On Wed, Mar 08, 2023 at 10:13:39AM +0000, Jonathan Wakely wrote:
> On Wed, 8 Mar 2023 at 07:25, Richard Biener wrote:
> >
> > On Wed, 8 Mar 2023, Alexander Monakov wrote:
> >
> > >
> > > On Tue, 7 Mar 2023, Jonathan Wakely wrote:
> > >
> > > > > Shouldn't this use the idiom suggested in ansidecl.h, i.e.
> > > > >
> > > > >   private:
> > > > >     DISABLE_COPY_AND_ASSIGN (auto_mpfr);
> > > >
> > > >
> > > > Why? A macro like that (or a base class like boost::noncopyable) has
> > > > some value in a code base that wants to work for both C++03 and C++11
> > > > (or later). But in GCC we know we have C++11 now, so we can just
> > > > delete members. I don't see what the macro adds.
> > >
> > > Evidently it's possible to forget to delete one of the members, as
> > > showcased in this very thread.
> >
> > Yes.  And I copy&pasted from somewhere I forgot which also forgot it ...
> 
> Looks like gcc/gimple-predicate-analysis.h and gcc/timevar.h each have
> two cases of a deleted copy constructor but no deleted assignment.
> I'll send a patch for those.

So perhaps use the = delete decls and a standardized comment (same wording
for all the auto_* types) above those which says what the above macro says?
Then one can grep that comment etc.

	Jakub