Re: [boost] [static_if] Is there interest in a `static if` emulation library?

Subject: Re: [boost] [static_if] Is there interest in a `static if` emulation library?
From: Roland Bock (rbock_at_[hidden])
Date: 2014-09-02 11:34:16

On 2014-09-02 14:08, Sebastian Redl wrote:
> On 02 Sep 2014, at 8:58, Roland Bock <rbock_at_[hidden]> wrote:
>
>> On 2014-09-02 03:27, Lorenzo Caminiti wrote:
>>
>> You could use inheritance. If the condition is true, you inherit from a
>> struct that provides the data member, otherwise you inherit from a
>> struct that does not. Ugly, I know, but it works if inheritance is an
>> option for you.
> That’s what I’m doing, but as you say, it is ugly:
>
>   template <typename Policy>
>   using proxy_base_t = std::conditional_t<
>       has(Policy::requirements, features::raw_access),
>       proxy_raw_access<proxy_nodot<Policy>>,
>       proxy_nodot<Policy>>;
>
> template <typename Policy>
> class proxy : public proxy_detail::proxy_base_t<Policy> {
> …
> };
>
> Sebastian
>
Yep, same here :-)

FYI: I might host an open session to discuss mixins at CppCon on Monday
(not formally confirmed yet). At least the way I envision them, they
would allow adding members without inheritance.

Roland