Why c++ generated header in sample skip field id 12?

[jacobwpeng]

New to this amazing lib, I'm very curious about the generated header of monster.fbs
add_name calls AddOffset(10, name);
add_inventory calls AddOffset(14, inventory);

I manually changed 14 to 12, and next color field from 16 to 12, everything works jsut fine!
and from the source code I read, AddOffset just PushElement of length sizeof(voffset_t), so there shouldn't be any problem with that.
And I print all the voffset_t in vtable offsets, field 12 is 0.
Forgive me if I missing something really obviously...

[ghost]

If you look in the schema file, you'll see that the field at offset 12 in the vtable is a deprecated field. It is present in the vtable, but not in the object. If you go change these offsets, you'll break forwards/backwards compatability (see the "internals" document).

[jacobwpeng]

Thanks, I do forget that deprecated field...