Hello, I have a question about the Boost.Optional documentation, explicitly about the paragraph on "Requirement Portability" <http://www.boost.org/doc/libs/1_35_0/libs/utility/operators.htm#portability>: Is this really true? Can someone please provide any reference to the standard? And if it is true, would that mean that for *any* map<T,U> requires that U is DefaultConstructible as this is required by map<T,U>::operator[], regardless of whether operator[] is used or not? (It's actually a little bit different because the Boost.Operators library uses friend functions). I have read 14.7 and discussed it with two colleagues, and we agree that the documentation is wrong and that this paragraph should simply be removed, but I would just like to check that I haven't overlooked something. Regards, Daniel