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[Bug libstdc++/69354] std::thread doesn't support move-only callable objects


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69354

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Anthony Williams from comment #3)
> I hadn't noticed I had omitted the const!

It took me a while to spot it too!

> Surely the intent of 12.8p11.2 is that if you can't actually copy the bases
> and/or members with the specified signature then the defaulted copy
> constructor is deleted?

One would think so, yes.

> Are you going to file the DR or shall I?

I'll do so.

> Potential core defect aside, I still think this class should work with
> std::thread, as it fits the MoveConstructible requirement.

Yes, I tried to find a way to declare this INVALID but couldn't find one :-)

The fact we use std::tuple in std::thread is purely an implementation detail
and any limitation in our tuple shouldn't prevent valid uses of std::thread.

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