On Fri, Jan 10, 2020 at 9:52 AM Christophe Meessen <christophe.mees...@gmail.com> wrote: > > It is possible to reduce the capacity of a slice by using the full slice > expression (https://golang.org/ref/spec#Slice_expressions). > > Now consider the following code where a is a 1MB slice. I then create b, a > slice of a, but with a much smaller capacity. Finally, I change the value of > a so that only b refers to the slice element storage. > > a := make([]byte, 1000000) > b := b[:3:3] > a = nil > > Will the garbage collector be able to recover the inaccessible space in the > slice element storage ?
Specification does not directly define this, so the answer is - possibly. AFAICT, no current Go compiler can free partial heap objects. But there's one guarantee - the "dead" slice portion after cap will not be scanned by the collector if no other live object uses it. -- 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/CAA40n-UqAuLnMZBOWbcswBUkgvFSNwOv58D9kpJGYdH0VVA7Qg%40mail.gmail.com.
