Hey Thiago, have you checked my concept based solution above?


On Fri, Nov 25, 2022, 18:25 Thiago Macieira via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> On Friday, 25 November 2022 08:45:41 PST Arthur O'Dwyer via Std-Proposals
> wrote:
> > Frederick's suggested solution was to just make it work by magic:
> >
> > void Red(__chimerical(Control, TextEntry) *p) {
> > p->SetBackgroundColor(); // this means
> Control::SetBackgroundColor
> > p->SetValue("pending"); // this means TextEntry::SetValue
> > }
> [snip]
>
> Please ignore my earlier replies today, before reading what the feature
> was
> actually trying to achieve.
>
> A third alternative, in addition to the two that Arthur suggested, is a
> simple
> pointer wrapper that stores one pointer to each of the requested
> sub-objects
> of the object.
>
> template <typename... Bases>
> struct chimeric_pointer : chimeric_pointer_storage<Base>...
> {
> template <typename T>
> chimeric_pointer(T *obj) : chimeric_pointer_storage<Base>(obj)... {}
> };
> or something, plus a set of std::get or get members to extract each of the
> sub-objects as desired, to write something like:
>
> void Red(chimeric_pointer<wxControl, wxTextEntry> p)
> {
> p.get<wxControl>()->SetBackgroundColor();
> p.get<wxTextEntry>()->SetValue("pending");
> };
>
> This idea would have a size of N * sizeof(void*) for N bases. I don't know
> if
> it's possible to shrink it without a getter that is per chimeric pointer
> and
> per complete object type.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
> Software Architect - Intel DCAI Cloud Engineering
>
>
>
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