Per capnp "evolving your schema" we tried changing the name of a struct but
keeping its id the same e.g. changing this:
struct MyMessageList {
mList @0: List(MyMessage);
}
struct MyMessage {
field0 @0: Int32;
}
to this:
struct MyMessageList {
mList @0: List(DeprectedMyMessage);
}
struct DeprectedMyMessage @0xd4201303ceef0b19 {
field0 @0: Int32;
}
We found that the generated header files were the same (modulo the name
change), but that the data section in the c++ files had changed values,
which was worrisome. For example:
static const ::capnp::_::AlignedData<58> b_b23f9d28332a82cf = {
| static const ::capnp::_::AlignedData<59>
b_b23f9d28332a82cf = {
static const ::capnp::_::AlignedData<58> b_b23f9d28332a82cf = {
| static const ::capnp::_::AlignedData<59>
b_b23f9d28332a82cf = {
{ 0, 0, 0, 0, 5, 0, 6, 0,
{ 0, 0, 0, 0, 5, 0, 6, 0,
207, 130, 42, 51, 40, 157, 63, 178,
207, 130, 42, 51, 40, 157, 63, 178,
50, 0, 0, 0, 2, 0, 0, 0,
| 60, 0, 0, 0, 2, 0, 0, 0,
171, 205, 79, 88, 213, 104, 54, 210,
171, 205, 79, 88, 213, 104, 54, 210,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
21, 0, 0, 0, 50, 2, 0, 0,
| 21, 0, 0, 0, 130, 2, 0, 0,
53, 0, 0, 0, 7, 0, 0, 0,
| 57, 0, 0, 0, 7, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
49, 0, 0, 0, 175, 0, 0, 0,
| 53, 0, 0, 0, 175, 0, 0, 0,
Is it expected that the data section would change in this way? Does it
affect the serialization / deserialization in a safe or unsafe way? What is
the data section encoding anyway?
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