Casting double array to a struct of doubles

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No, it’s not guaranteed.

The only thing prohibiting any compiler from inserting padding between x and y, or between y and z is common sense. There is no rule in any language standard that would disallow it.

Even if there is no padding, even if the representation of A is exactly the same as that of double[3], then it’s still not valid. The language doesn’t allow you to pretend one type is really another type. You’re not even allowed to treat an instance of struct A { int i; }; as if it’s a struct B { int i; };.

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