On Thu, 28 Nov 2024 at 23:36, 'Константин Иванов' via golang-nuts < golang-nuts@googlegroups.com> wrote:
> Hello. > > May be because all zero-size values have the same pointer: > https://go.dev/play/p/n0dKQFN2EpR > Because the values have no memory location. > I think that's *part* of the story: we can't just take a pointer to the zero-sized value because that may or may not be guaranteed to be the same pointer (there's no language guarantee that it is, and indeed in some circumstances it might not be). So we need a non-nil pointer to *something* as a placeholder. But why uintptr? AFAICS that zero variable could have been defined as any non-zero-sized type. Perhaps uintptr was chosen to guarantee word alignment and avoid any potential false sharing? четверг, 28 ноября 2024 г. в 14:21:06 UTC+3, Jochen Voss: > >> Dear all, >> >> I am looking at the source code for the new "unique" package (just out of >> curiosity). >> One thing I did not understand: why is `zero` defined to be an `uintptr`? >> >> https://cs.opensource.google/go/go/+/master:src/unique/handle.go;l=16 >> >> My understanding is the `zero` variable just provides a unique memory >> location, and any type, e.g. byte, would have worked just as well. Is this >> right? Was uintptr choosen for performance reasons? Or to guarantee >> alignment? >> >> Many thanks, >> Jochen >> > -- > 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 visit > https://groups.google.com/d/msgid/golang-nuts/248ca7dc-debb-438e-b858-bdc6aa2c2e17n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/248ca7dc-debb-438e-b858-bdc6aa2c2e17n%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 visit https://groups.google.com/d/msgid/golang-nuts/CAJhgachFAMRwwuaapjLbDrepFXv_cgEsnqt1SKc8O8%2BWLoP08g%40mail.gmail.com.
