[cxx-abi] Re: [cxx-abi-dev] Tail padding, in sumary

[Nathan Sidwell]

"Nelson, Clark" wrote:
> struct X { int x: 1; };
> struct Y { struct X x; int y: 1; };
> 
> I think it would be far more awkward to explain that you can't copy the x
> member using memcpy without running the risk of modifying y. Note that this
> case is expressible in C. Surely the base (C) ABI doesn't have x and y
> overlapping at the byte level.
No this is different, in your example, X is PoD, and so its tail
padding is not useable. The cases we're talking about concern a non-PoD
A, and so by definition is not expressible in C.

nathan

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