That address is not in the heap. It is the address of a special word in the
runtime, called runtime.zerobase, which is explicitly for this purpose. It
is a place to point things that need to be non-nil but have no size.
On Wednesday, September 7, 2022 at 12:01:28 PM UTC-7 me...@pobox.com wrote:
> Running this:
>
> emptyslice := []string{}
> sh := (*reflect.SliceHeader)(unsafe.Pointer(&emptyslice))
> fmt.Printf("empty slice cap = %d\n", sh.Cap)
> fmt.Printf("empty slice len = %d\n", sh.Len)
> fmt.Printf("empty slice uintptr = %v\n", sh.Data)
>
> Output:
>
> empty slice cap = 0
> empty slice len = 0
> empty slice uintptr = 824634224152
>
> The non-zero uintptr suggests that something is allocated on the heap. But
> the cap is 0, so any backing array should have a size of 0. So what is
> allocated on the heap? Surely not an array of size 0?
>
>
> mathew
>
--
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/8adabc71-f706-4638-8e17-8f3876b9abadn%40googlegroups.com.
