Re: [boost] Access to unaligned (packed) structs

Roland Schwarz wrote:

So even in the following case where T is an POD-object type:

struct U { T t; };

and when sizeof(T) == sizeof(U)

I am allowed to:

T t; U u1; U u2;

memcpy(&t,&u1,sizeof(T); memcpy(&u2,&t,sizeof(T);

and rely on u1 == u2, but may not rely on: t == u1 or t == u2, because there are no guarantees about value representation guarantees between U and T.

Correct?

Yes, I think this is correct. Sebastian Redl