On Fri, Dec 13, 2019 at 7:58 AM jianping z via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> Hi all,
>
> I have a proposal to add a const-able feature to the language in
> addition to "const" keyword. it can greatly reduce the duplicated code
> written for const and non-const method/function pair.
>

It sounds like this has some overlap with "Deducing this":
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0847r2.html

-- 
Arvid Norberg