Interesting. That seems to break the comparable spec.
>> Pointer types are comparable. Two pointer values are equal if they point to
>> the same variable or if both have value nil. Pointers to distinct zero-size
>> variables may or may not be equal.
>> it would be valid for `==` on pointers to zero-sized types to always
>> evaluate to `true`,
This would be more straightforward behavior.
> On Feb 26, 2024, at 9:24 AM, tapi...@gmail.com <tapir....@gmail.com> wrote:
>
> package main
>
> var a, b [0]int
> var p, q = &a, &b
>
> func main() {
> if (p == q) {
> p, q = &a, &b
> println(p == q) // false
> }
> }
>
> On Thursday, February 22, 2024 at 6:55:49 PM UTC+8 Brien Colwell wrote:
>> I'm confused by this output. It appears that the interface of two different
>> pointers to an empty struct are equal. In all other cases, interface
>> equality seems to be the pointer equality. What's going on in the empty
>> struct case?
>>
>> ```
>> package main
>>
>> import "fmt"
>>
>> type Foo struct {
>> }
>>
>> func (self *Foo) Hello() {
>> }
>>
>> type FooWithValue struct {
>> A int
>> }
>>
>> func (self *FooWithValue) Hello() {
>> }
>>
>> type Bar interface {
>> Hello()
>> }
>>
>> func main() {
>> a := &Foo{}
>> b := &Foo{}
>> fmt.Printf("%t\n", *a == *b)
>> fmt.Printf("%t\n", a == b)
>> fmt.Printf("%t\n", Bar(a) == Bar(b))
>>
>> c := &FooWithValue{A: 1}
>> d := &FooWithValue{A: 1}
>> fmt.Printf("%t\n", *c == *d)
>> fmt.Printf("%t\n", c == d)
>> fmt.Printf("%t\n", Bar(c) == Bar(d))
>> }
>> ```
>>
>> Prints (emphasis added on the strange case):
>>
>> ```
>> true
>> false
>> **true**
>> true
>> false
>> false
>> ```
>>
>>
>
>
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