The reason why implicit conversions from []Foo to []Stringer isn't
supported is because Foo and Stringer have different in-memory
representations. Converting from a slice of one to a slice of another would
be more expensive than one would expect an implicit conversion to be. At
least, this is my understanding as to why.
On Wed, Jun 17, 2020 at 3:22 AM Miguel Angel Rivera Notararigo <
ntr...@gmail.com> wrote:
> Allowing this implicit conversion would be a bad thing? because it works
> like generics without any new syntax.
>
> Also, I found this a little messy
>
> type Ordered interface {
> type int, int8, int16, int32, int64,
> uint, uint8, uint16, uint32, uint64, uintptr,
> float32, float64,
> string}
>
>
> Why not after interface?
>
> type Ordered interface type {
> int, int8, int16, int32, int64,
> uint, uint8, uint16, uint32, uint64,
> byte, rune, uintptr,
> float32, float64,
> string,}
>
>
> Sorry, I am pretty new to this, so probably the answers might be really
> obvious 😅
>
> On Wed, Jun 17, 2020 at 4:37 AM David Anderson <d...@natulte.net> wrote:
>
>> The non-generic form _only_ accepts an argument of type []Stringer. If
>> you have a []Foo, where Foo implements Stringer, that's not good enough.
>> You will have to construct a []Stringer explicitly, and copy each Foo into
>> that []Stringer. This is a fairly common gotcha with Go, where folks expect
>> the implicit conversion to happen.
>>
>> OTOH, the generic form will accept []Foo directly, since Foo satisfies
>> the Stringer constraint.
>>
>> - Dave
>>
>> On Wed, Jun 17, 2020 at 1:20 AM Christophe Meessen <
>> christophe.mees...@gmail.com> wrote:
>>
>>> Reading the document "Type parameters - Draft desing" of June 16, 2020 (
>>> https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-type-parameters.md),
>>> I wonder if these two following function definitions are not equivalent and
>>> thus interchangeable
>>>
>>> func Stringify(type T Stringer)(s []T) (ret []string)
>>>
>>> func Stringify(s []Stringer) (ret []string)
>>>
>>> If the constrain is an interface, wouldn’t it be the same as to use the
>>> interface as type ? How would it be different ?
>>>
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