220 37886 <CAFk2RUbmRs7E5wZ6xFKL7ehXc8pn3g9Hj-n8p=FcA1qU-QHeMw@mail.gmail.com> article
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From: Ville Voutilainen <ville.voutilainen@gmail.com>
Newsgroups: gmane.comp.lang.c++.isocpp.proposals
Subject: Re: API versioning: functions: overload; classes:
 typedef; variables: <meep>
Date: Fri, 20 Apr 2018 10:44:44 +0300
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On 20 April 2018 at 10:40, Mutz, Marc <marc@kdab.com> wrote:
> Hi,
>
> This is an idea about API migration. Assume you have a public API, and you
> discover that you made a typo in an identifier (there are tons of other
> reasons to use the mechanisms that I'll show, but let's stay with typo for
> the sake of argument). How to fix?
>
> For functions, we can add a new function and deprecated the old:
>
>    // v1
>    bar make_bra();
>
>    // v2
>    [[deprecated("use make_bar()")]] bar make_bra() { return make_bar(); }
>    bar make_bar();
>
> For classes, we can use a typedef:
>
>    // v1
>    class bra { ~~~ };
>
>    // v2
>    class bar { ~~~ };
>    [[deprecated("use bar")]] using bra = bar;
>
> For variables, there's no way:
>
>     // v1
>     static inline bar my_bra; // oops! no source migration path :(
>
> I have two questions:
>
> 1. Is there anything in the pipeline that would address migrating variable
> names?
> 2. Assuming there's nothing, what about overloading the using keyword for
> this?


See http://open-std.org/JTC1/SC22/WG21/docs/papers/2018/p0945r0.html
We're going to review it in Rapperswil.

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