Re: [Boost-users] Pointer Container Library changes in 1.66.0

Subject: Re: [Boost-users] Pointer Container Library changes in 1.66.0
From: Daniel James (dnljms_at_[hidden])
Date: 2018-04-05 17:35:40

On 5 April 2018 at 17:45, Nevin Liber <nevin_at_[hidden]> wrote:
> On Thu, Apr 5, 2018 at 11:25 AM, Daniel James via Boost-users
> <boost-users_at_[hidden]> wrote:
>>
>> On 5 April 2018 at 16:11, Thorsten Ottosen via Boost-users
>> <boost-users_at_[hidden]> wrote:
>> >
>> > It's the fact that one of the merged changes was to inherit privately
>> > from
>> > the clone_allocator which in turn forbids the use of final classes as
>> > clone_allocator types.
>>
>> Oh, that's something I haven't thought about. There are quite a few
>> places in boost where inheritance from generic types is used,
>> presumably they've all got the same problem. I'm not sure if there's a
>> good way to handle this.
>
>
> Can't you just wrap it and derive from the wrapper?
>
> For instance, I have a wrapper (which is a little overkill for this) at
> ebo_wrapper.h.  My version uses the traits in std, but Boost.TypeTraits has
> equivalents.

boost::is_final doesn't work everywhere, and std::is_final is C++14,
so I don't think we've got wide enough support.

(resent as accidentally sent off list)

This pull request will help:

https://github.com/boostorg/type_traits/pull/60

But still won't have full support.