Good idea in my opinion.

On Fri, Mar 25, 2022 at 7:47 PM Frederick Virchanza Gotham via
Std-Proposals <std-proposals_at_[hidden]> wrote:

>
> Normally the behaviour is undefined when you dereference a nullptr, but
> it's allowed with decltype, for example the following is valid code:
>
> decltype( static_cast<std::string*>(nullptr)->compare("Hello") )
> my_var;
>
> ++my_var;
>
> I think decltype should be given another privilege: To get the type of
> protected/private members, for example:
>
> class Dog {
> private:
> int calibration[3u][2u][7u];
> };
>
> int main(void)
> {
> Dog doggy;
>
> decltype(doggy.calibration) my_array;
> }
>
> This past week I was writing code for an Arduino microcontroller to save
> POD's to the onboard non-volatile Flash, and I had to edit a class to
> change a member from protected to public just so that I could use decltype
> on it. This shouldn't be necessary -- just allow decltype to get the type
> of anything irrespective of accessibility.
>
>
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>