The field can't be reordered. I want to use zero-sized data type to mark offset and has no effect on struct size, I can take the address of it and use it like: ```go c := ... cmd := (*[SIZE]byte)(unsafe.Pointer(&c.Inner)) ``` I am using this on mmap-ed memory. I've found a workaround to do the same thing by adding `c` pointer with it's data size
Pada Jumat, 14 Oktober 2022 pukul 00.21.38 UTC+7 Marcel Huijkman menulis: > What is the usage of that zero-sized data type? Can you give an example > where that Inner field has any usage? > > On Wednesday, October 12, 2022 at 7:27:14 PM UTC+2 > axel.wa...@googlemail.com wrote: > >> You can re-order the fields to get the desired effect: >> https://go.dev/play/p/E1KTqVp0i-v >> >> On Wed, Oct 12, 2022 at 6:01 PM Richiise Nugraha <rich...@gmail.com> >> wrote: >> >>> Hi, I am looking for zero-sized data type, something like Flexible Array >>> Member. >>> The size of `struct {}` is indeed zero, but for what reason when it's >>> inside a struct with another member say ( >>> https://go.dev/play/p/DpydJIke7dS): >>> >>> type C struct { >>> Pre uint64 >>> Inner struct{} >>> } >>> >>> That struct sized for 16, while the sum of all member sizes is only 8, >>> it's like there's hidden padding/align. >>> >>> Thanks! >>> Nugraha >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "golang-nuts" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to golang-nuts...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/golang-nuts/2f7254a8-379a-4dc2-bf10-70ee7a209af2n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/golang-nuts/2f7254a8-379a-4dc2-bf10-70ee7a209af2n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/d76e1e0c-af1e-4741-b868-842cc1d587e3n%40googlegroups.com.
