Re: [boost] variant2 never empty guarantees (was: Re: Outcome/expected/etc/etc/etc)

Andrzej Krzemienski wrote:

Now I realize this all means the types inside variant need to be movable. This will not be a problem in most of the cases, but does it mean I cannot use variant2 with non-movable types?

You can, it will double-buffer to keep emplace strong. Or you can use valueless. All types nothrow move constructible -> single buffer; Otherwise, first alternative is valueless -> single buffer; Otherwise -> double buffer.