Re: [boost] config library request

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-12-09 07:59:57

No, I was mistaken. I posted a proposal that it be added to the language to
csc++, but I think it was lost in the noise ;-(

Sorry for the misdirection,
Dave

----- Original Message -----
From: "John Maddock" <John_Maddock_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Sunday, December 09, 2001 7:44 AM
Subject: [boost] config library request

>
> >Lots of compilers (msvc, borland, metrowerks) currently don't handle
> >conversions of cv-qualified member functions into cv-unqualified member
> >functions correctly (yes, Virginia, that's a legal and correct implicit
> >conversion). I'd like a config macro to detect that.
> >BOOST_NO_POINTER_TO_MEMBER_CONST seems to be in the same area, but AFAICT
> it
> >means the opposite of what I'm looking for: the workaround in these cases
> is
> >to declare overloads.
>
> I really had to think about that - it seems logical when you think about,
> but I found this in the standard:
>
> "12[Note: some conversions which involve only changes in cv-qualification
>   cannot  be  done  using const_cast.  For instance, conversions between
>   pointers to functions are not covered because such conversions lead to
>   values  whose  use  causes  undefined behavior.  For the same reasons,
>   conversions between pointers to member functions, and  in  particular,
>   the  conversion from a pointer to a const member function to a pointer
>   to a non-const member function, are not covered.  ]"
>
> And I can't find anything under "standard conversions" than would allow
the
> conversion you want.  Are you sure that you are right here?  Anyway,
> assuming you are, just go ahead and add the macro, along with an
> appropriate test case.
>
> - John Maddock
> http://ourworld.compuserve.com/homepages/john_maddock/
>
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