[libcxx-dev] Providing custom template specialization for std::optional?

[Eric Fiselier via libcxx-dev]

On Wed, Mar 6, 2019 at 5:41 PM Владимир Гончаров via libcxx-dev <
libcxx-dev at lists.llvm.org> wrote:

> Hello!
>
> I'm implementing a specialization for std::optional for my program-defined
> type.
>

Can you explain what your specialization does differently? And why it's
needed?


> As I understand *[namespace.std]*, nothing forbids me from doing that.
>

I agree that you've interpreted the standard correctly. But I think the
standard is being too permissive here.
Implementing a complex component may necessitate knowledge of the
internals. `<variant>` is a good example.

I would like to know what other library maintainers think.

/Eric
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