Hi,
this has come up on the issue as well. Robert Griesemer provided an
explanation
<https://github.com/golang/go/issues/56351#issuecomment-1601751291>:
If the argument type (the type of the argument provided to clear) is a type
> parameter (is of type parameter type), all types in its type set (in the
> type set of the constraint corresponding to the type parameter) must be
> maps or slices, and clear performs the operation corresponding to the
> actual type argument (corresponding to the type of the actual type argument
> with which the type parameter was instantiated).
That is, the sentence is about this situation:
func Clear[T, any, S ~[]T](s S) {
clear(s)
}
func main() {
Clear(make([]int, 42))
}
In this case, the type of s is S, which is a type parameter. So `clear`
performs the operation corresponding to the type argument - in this example
[]int.
The sentence is a bit confusing (I've seen this question come up four times
now), so it probably should be clarified a bit.
On Wed, Jul 5, 2023 at 9:06 AM Tharaneedharan Vilwanathan <
vdhar...@gmail.com> wrote:
> Hi All,
>
> Go 1.21 introduces a new clear() builtin function. I see this text in
> https://tip.golang.org/ref/spec#Clear:
>
> clear(t) type parameter see below
>
> If the argument type is a type parameter
> <https://tip.golang.org/ref/spec#Type_parameter_declarations>, all types
> in its type set must be maps or slices, and clear performs the operation
> corresponding to the actual type argument.
>
> I am not able to make sense of it. What does this mean? Any examples on
> the usage?
>
> Appreciate your help.
>
> Thanks
> dharani
>
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