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I think that Question about C++ navigation should be on Stack Exchange. So I tried to flag it as off-topic - the off-topic box only gave me the choice of meta for this - on other SE sites it would list other SE sites.
In this case, I think the post is OK for the site, and it's gotten some decent answers.
In the future, you can flag a post for moderator attention and a moderator can migrate it to any SE site if it needs to be moved.