Is there a reason when a function should return a RValue Reference? A technique, or trick, or an idiom or pattern?
MyClass&& func( ... );
I am aware of the danger of returning references in general, but sometimes we do it anyway, don't we (
T& T::operator=(T) is just one idiomatic example). But how about
T&& func(...)? Is there any general place where we would gain from doing that? Probably different when one writes library or API code, compared to just client code?