Re: ostream operator<< for volatile void *

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On Fri, Apr 16, 2021 at 2:59 AM Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote:
> On Fri, 16 Apr 2021, 02:43 NightStrike via Gcc-help, <gcc-help@xxxxxxxxxxx> wrote:
>>
>> Currently, printing a "void *" works fine, and printing a "volatile
>> void *" fails with a very unclear error.  This appears to be due to
>> the nonexistence of a function that can handle a volatile pointer.
>> While I am guessing that it is not covered by the standard, would GCC
>> folks consider having a GCC extension that can properly print it?
>
>
> No, I don't think so. Can't you just use const_cast?

Yes, and I can also just write the overload myself (which is what I
ultimately did) as:

inline std::ostream & operator<<(std::ostream & os, void const volatile * p) {
        return os << const_cast<void const *>(p);
}

But, I find it surprising as a user that I have to do this, and I
don't understand the rationale for why the standard would
intentionally leave it out.



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