On Fri, Jul 24, 2020 at 4:07 PM Tony Yang <tonyy...@umich.edu> wrote:
>
> Hi Go community,
>
> I am wondering if a method with the pointer receiver keeps the receiver
> instance from garbage collected.
>
> To put the idea into a code example
>
> ```
> type counter struct {
> c int
> }
>
> func (c *counter) next() int {
> c.c = c.c + 1
> return c.c
> }
>
> func getNextFunc() func () int {
> // Question: will c be garbage collected after the function retruns?
> c := &counter{}
> return c.next
> }
The mere existence of a pointer receiver does not prevent a value from
being garbage collected. In your example, if the counter value is
allocated on the heap in getNextFunc, that heap allocation can be
collected after getNextFunc returns (in practice in this example c
would be allocated on the stack, not the heap, anyhow).
Ian
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