Re: [go-nuts] Re: Can hand-written move function without runtime support take the ownership of an object entirely?

['robert engels' via golang-nuts]

Some good info here https://blog.stephencleary.com/2010/02/q-should-i-set-variables-to-null-to.html#:~:text=Setting%20instance%20fields%20to%20null%20does%20not%20help%20the%20garbage,this%20is%20a%20rare%20situation. On Feb 24, 2026, at 7:43 AM, 'Qingwei Li' via golang-nuts <golang-nuts@googlegroups.com> wrote: replies are in link:  Re: [go-nuts] Does hand-written move function without runtime support can transfer the ownership of an object entirely? On Wednesday, January 7, 2026 at 11:29:21 AM UTC+8 Qingwei Li wrote: Take the following program as an example. ```go c, err := getFtpConnection() if err != nil { return nil, err } go func(c2 *ftp.ServerConn) { c2.List() }(c) // c will not be used later ``` let's add `move` function. ```go func move[T any, PT *T](pp *PT) (res PT) { res = *pp *pp = nil return } // Goroutine G1 c, err := getFtpConnection() if err != nil { return nil, err } go func(c2 *ftp.ServerConn) { // Goroutine G2 c2.List() }(move(&c)) // c will not be used later ``` Would this `move` without runtime support make GC unable to reach the object pointed by `c` scanning from the stack of goroutine G? If it does, the ownership of object is entirely moved to goroutine G2. With the ownership transfering, freegc for `c2` in the end of goroutine G2 is feasible in cross-goroutine reference case. -- 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/af0d34ff-c78c-4d86-97b6-0e7a347b1975n%40googlegroups.com. -- 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/7A5C036F-9524-4FD7-8A10-797C37104DED%40me.com.