Do the padding bytes of a POD type get copied?

Question

Suppose I have a POD type like this:

struct A {
    char a;
    int b;
};

On my system, sizeof(A) == 8, even though size

Answer 1

given that you asked about a POD type ( hence including unions ) it's worth mentioning that according to [class.copy]

The implicitly-defined copy/move constructor for a union X copies the object representation (6.9) of X

that for trivially copyable types should include padding bits as well. So, it could be just a matter of replacing A with

union A{ struct {
    char a;
    int b;
}; };

(actually, the above uses a non standard anonymous struct, but you get the point ... )