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Message: [QUOTE="Jerry Coffin, post: 3967744"] In C++ 0x, the definition of POD no longer includes the requirement that the class be an aggregate. Instead, it introduces a couple of new terms, "standard layout class" and "trivial class". A POD has to be both. A user-defined constructor (by itself) does _not_ prevent the class from being a POD -- but you have to be really careful. In particular, a non-trivial copy constructor or non-trivial destructor _does_ prevent it from being a trivial class (IOW, copying with memcpy/memmove should work correctly). A standard layout class basically says it can't have virtual functions or virtual base classes, etc. As long as it fits both of those sets of restrictions, it's a POD. IOW, it _can_ have some "convenience ctors". Obviously I'm leaving out some of the details -- see N2960, §9/5, 9/6 for the full details. [/QUOTE]