My intuition above seems to contrast with
https://godoc.org/golang.org/x/mobile/cmd/gobind:
Avoid reference cycles
> The language bindings maintain a reference to each object that has been
> proxied. When a proxy object becomes unreachable, its finalizer reports
> this fact to the object's native side, so that the reference can be
> removed, potentially allowing the object to be reclaimed by its native
> garbage collector. The mechanism is symmetric.
On Wednesday, August 2, 2017 at 5:30:16 PM UTC-7, Antonio Marcedone wrote:
>
> I am not sure I understand what is going on here.
> For reference, the relevant code is:
>
> String s = "This is a test string";
>
> MyStruct struct = new MyStruct(s.getBytes("UTF-8"));
> //struct.setE(s.getBytes("UTF-8"));
> tv.append("\nFirst time: "+ new String(struct.getE(), "UTF-8"));
>
>
> with corresponding go part:
>
> package test
>
> type MyStruct struct{
> E []byte}
>
> func NewMyStruct(e []byte) *MyStruct{
> return &MyStruct{e}}
>
>
> so s.getBytes allocates a new byte[] (in Java). Then the MyStruct
> constructor is called, and it gets a reference to such byte[].
> Are you saying that since the Java garbage collector is not aware that a
> reference to that array is stored in some variable in the go code, then it
> just deletes it as soon as the constructor returns?
> And then the getE method just reads whatever happens to be in memory where
> the old array was without throwing any error despite the fact that the old
> byte[] has been garbage collected and might have been overwritten by
> arbitrary data?
>
> Thanks a lot for your response!
> Antonio
>
> On Wednesday, August 2, 2017 at 3:30:06 PM UTC-7, Elias Naur wrote:
>>
>> []byte arguments are passed by reference, not copied. You need to copy
>> any byte slices you retain after the function or method call.
>>
>> - elias
>>
>
--
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.
