Re: [boost] Adding polymorphic_value to boost

On 20 Nov 2017, at 18:29, Zach Laine via Boost wrote:

On Mon, Nov 20, 2017 at 12:23 PM, Jonathan Coe via Boost < boost@lists.boost.org> wrote:

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On 20 Nov 2017, at 17:59, Peter Dimov via Boost wrote:

Two classes instead of one is not without its downsides, since they are very similar in both appearance in behavior, but on the plus side, this allows us to make the interface of the pointer class unapologetically pointer-like and the interface of the value class... well, as value-not-pointer-like as possible, which isn't much due to op->, but still. :-)

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I’m proposing adding polymorphic_value to boost, not cloned_ptr. My submission to boost is intended to mirror my submission to the C++ standards committee.

To answer the proximate question, LEWG wanted nothing to do with clone_ptr, whether or not it is designed to support or interoperate with polymorphic_value. Jonathan, please correct me if I'm wrong.

Zach

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Zac is correct. LEWG requested that const propagation was added to X and that it ceased to be pointer-like. I agree with their direction. Sean (Parent) gave a rather nice talk which mentioned this at code dive 2016: https://youtu.be/cK_kftBNgBc about 40 mins in.