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Message: [QUOTE="JohnQ, post: 2933561"] I meant in memory. I still have the same question as when I started I guess: "when does a struct stop being a struct?". And by that, I mean the guarantees I have for using it in a memcpy call for example. struct A { int val; }; class B { int val; B(int x){ val = x; } }; Is the following always trouble (?): memcpy(&A, &B, sizeof(A)); Yeah, but that's my issue (I know I didn't state it very directly probably). I'm not really worried about the behavioural diffences. John [/QUOTE]