On Wednesday, 1 July 2015 at 20:01:08 UTC, dd0s wrote:
i have the following struct, and i expect it to have 30 bytes
but sizeof tells me it has 32 bytes. dmd seems to still use
4byte alignment altough i specified to align 2bytes.
struct netadr_t {
align(2):
int type; // 0
int scope_id; // 4
short port; // 8 // <-- this is 4 bytes instead of 2
int sock; // 10
union {
ubyte[4] ip; // 14
ubyte[10] ipx;
ubyte[16] ip6;
}
}
since i'm interfacing with a c library the struct layout has to
be equal :(
Disclaimer: My understanding of all things alignment is limited.
`pragma(msg, netadr_t.sock.offsetof);` prints "10LU", so port
seems to really only take 2 bytes. The struct itself has padding
at the end. You can eliminate that with an `align(1)` on the
struct:
----
align(1) struct netadr_t {
align(2):
...
}
----
