This one doesn't compile either.
So the range operation doesn't support values of parameter types?
type MyByte byte
func Bar[T []byte|[]MyByte](s T) {
for range s {} // cannot range over s (variable of type T constrained
by []byte|[]MyByte) (type set has no single underlying
}
On Friday, November 12, 2021 at 11:40:53 PM UTC+8 axel.wa...@googlemail.com
wrote:
> On Fri, Nov 12, 2021 at 4:29 PM tapi...@gmail.com <tapi...@gmail.com>
> wrote:
>
>> On Friday, November 12, 2021 at 11:10:17 PM UTC+8
>> axel.wa...@googlemail.com wrote:
>>
>>> `range s` works differently for string and []byte. In the former case it
>>> iterates over utf8-encoded unicode codepoints, in the latter it iterates
>>> over bytes.
>>>
>>
>> It is true, but why it matters here?
>>
>
> Because it makes `range` different operations for the purposes of
> determining the allowed operations on a type-parameter.
>
>
>>
>>
>>>
>>> On Fri, Nov 12, 2021 at 3:18 PM tapi...@gmail.com <tapi...@gmail.com>
>>> wrote:
>>>
>>>>
>>>> func Bar[T []byte|string](s T) bool {
>>>> for _, v := range s { // cannot range over s (variable of type T
>>>> constrained by []byte|string) (T has no structural type)
>>>> if v > 100 {
>>>> return true
>>>> }
>>>> }
>>>> return false
>>>> }
>>>>
>>>> The message is quite confusing.
>>>>
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