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Subject: Re: [std-proposals] Allowing access to object representations
From: sdkrystian (sdkrystian_at_[hidden])
Date: 2019-08-17 19:02:58


That has no effect, the array is an array of unsigned char objects, so a pointer arithmetic applied to a element of it is well within the rules.Sent from my Samsung Galaxy smartphone.
-------- Original message --------From: Language Lawyer via Std-Proposals <std-proposals_at_[hidden]> Date: 8/17/19 19:59 (GMT-05:00) To: std-proposals_at_[hidden] Cc: Language Lawyer <language.lawyer_at_[hidden]> Subject: Re: [std-proposals] Allowing access to object representations https://timsong-cpp.github.io/cppwp/n4659/expr.add#6On 18/08/2019 02:49, sdkrystian via Std-Proposals wrote:> unsigned char.> > > > Sent from my Samsung Galaxy smartphone.> > -------- Original message --------> From: Language Lawyer via Std-Proposals <std-proposals_at_[hidden]>> Date: 8/17/19 19:46 (GMT-05:00)> To: std-proposals_at_[hidden]> Cc: Language Lawyer <language.lawyer_at_[hidden]>> Subject: Re: [std-proposals] Allowing access to object representations> > On 18/08/2019 02:42, sdkrystian via Std-Proposals wrote:>  > You're right, there wouldn't be unless I specified that the object representation is considered to be an array> > Array of which type???> >  > Sent from my Samsung Galaxy smartphone.>  >>  > -------- Original message -------->  > From: Language Lawyer via Std-Proposals <std-proposals_at_[hidden]>>  > Date: 8/17/19 18:58 (GMT-05:00)>  > To: std-proposals_at_[hidden]>  > Cc: Language Lawyer <language.lawyer_at_[hidden]>>  > Subject: Re: [std-proposals] Allowing access to object representations>  >>  > You propose:>  >  > Insert a new paragraph below [expr.reinterpret.cast] p6>  >  > A prvalue v of object pointer type "pointer to cv1 T1" pointing to an object a can be explicitly converted to an object pointer of a different type "pointer to cv2 T2", where cv2 is the same cv-qualification as, or greater cv-qualification than cv1, the result of which is defined as follows:>  >  > — f T1 is a contiguous-layout type and T2 is unsigned char, char or std::byte, the result is a pointer to the first element of the object representation of a.>  >>  > Is there much sense in specifying casts to `char` or `std::byte` as giving a pointer to the first element of the object representation?>  > You won't be able to use it for pointer arithmetic.>  > -->  > Std-Proposals mailing list>  > Std-Proposals_at_[hidden]>  > https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals>  >> -- > Std-Proposals mailing list> Std-Proposals_at_[hidden]> https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals> -- Std-Proposals mailing listStd-Proposals_at_[hidden]https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals



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