Re: [OpenMethod] review starts on 28th of April

From: Jean-Louis Leroy (jl_at_[hidden])
Date: 2025-05-06 22:52:39

Hi Steven,

> > I tried since you last suggested this. Couldn't make it work. The macro
> > generates something like:
> >
> > auto poke(std::ostream& a, virtual_ptr<Animal> b) -> void {
> >      method<poke_method(std::ostream& a, virtual_ptr<Animal> b)>::fn(a, b);
> > }
> >
> > There is no way to peel off the `void` from the signature with the syntax you
> > suggest.
> >
>
> It doesn't need to be peeled off by the macro. You're only using it
> as a template parameter, so you can just pass the whole signature
> as a function type.

What about the `void` after the arrow?

It might work if we could define a function using a function type:

    using Signature = void(std::ostream& a, virtual_ptr<Animal> b);

    Signature poke {
        method<poke_method(std::ostream& a, virtual_ptr<Animal> b)>::fn(a, b);
    }

Alas this is illegal. Not sure why. Probably because of the parameter names...

For what it's worth, here is the syntax that I would like:

    BOOST_OPENMETHOD(void poke(std::ostream&,virtual_ptr<Animal>)) { ... }

J-L

On Tue, May 6, 2025 at 5:34 PM Steven Watanabe via Boost
<boost_at_[hidden]> wrote:
>
> AMDG
>
> On 4/30/25 4:15 PM, Jean-Louis Leroy via Boost wrote:
> > Hi Joaquín,
> >
> > * Instead of BOOST_OPENMETHOD(poke, (std::ostream&,virtual_ptr<Animal>), void),
> > consider the possibility of using BOOST_OPENMETHOD(poke, void(std::ostream&,
> > virtual_ptr<Animal>)).
> >
> > I tried since you last suggested this. Couldn't make it work. The macro
> > generates something like:
> >
> > auto poke(std::ostream& a, virtual_ptr<Animal> b) -> void {
> >      method<poke_method(std::ostream& a, virtual_ptr<Animal> b)>::fn(a, b);
> > }
> >
> > There is no way to peel off the `void` from the signature with the syntax you
> > suggest.
> >
>
> It doesn't need to be peeled off by the macro. You're only using it
> as a template parameter, so you can just pass the whole signature
> as a function type.
>
> In Christ,
> Steven Watanabe
>
>
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