hi Jake On Sunday, February 24, 2019 at 11:27:10 PM UTC, Jake Montgomery wrote: > > Maybe I'm misunderstanding, but the important thing is that foo never be > copied. In your example, it is, in fact, *not *copied. See > https://play.golang.org/p/U5EsDZSO3ce. Note that Foo is copied, but both > f2 and f3 contain the same foo pointer, so the foo was never copied or > moved. >
indeed, this seems like the right semantics for me. i assume Go will be smart enough to run my finalizer that i set on foo only once. i think this will work, thank you very much! p.s.: i am still interested in why method resolution doesn't work across pointer types, as it seems like it could... but the interest is purely theoretical now. > When embedding a *foo, there is no real reason to use a *Foo, and the > example could be - https://play.golang.org/p/RapUv6AvPK-, > > On Sunday, February 24, 2019 at 5:34:27 PM UTC-5, Deomid Ryabkov wrote: >> >> thanks for the suggestion Burak and Jake, however embedding won't do for >> the same reason as aliasing - it allows copying by value, which i want to >> prevent (in my real use case foo.bar is a C pointer). >> >> https://play.golang.org/p/4BcOQTGkPiy works, and it should not (f3 := >> *f2 is a no as it makes copy of f2.bar) >> >> On Sunday, February 24, 2019 at 10:07:05 PM UTC, Jake Montgomery wrote: >>> >>> On Sunday, February 24, 2019 at 4:31:10 PM UTC-5, Deomid Ryabkov wrote: >>>> >>>> Why can't Go resolve methods declared on the pointer receiver of the >>>> destination type? >>>> >>> >>> Because that is not how the language was designed. (I'm too busy to >>> look up the spec here, but it is in there.) >>> >>>> >>>> consider: >>>> >>>> [SNIP] >>>> >>>> (playground link: https://play.golang.org/p/v0f9pYaTJAa ) >>>> >>>> it fails to compile with "prog.go:25:23: f2.GetBar undefined (type Foo >>>> has no field or method GetBar)" but it's not clear to me, why Foo doesn't >>>> get pointer methods from *foo. >>>> >>>> >>> You could try using an embedded type to have Foo "inherit" methods from >>> *foo, like this - https://play.golang.org/p/WvNj5GUjsxe. >>> >>> Good Luck >>> >> -- 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. For more options, visit https://groups.google.com/d/optout.
