[swift-evolution] [Pre-pitch] Conform Int (and others) to LosslessStringConvertible

[Xiaodi Wu]

Agree. The approved text of SE-0089 explicitly contemplates Int conforming
to LosslessStringConvertible. This would mean that it's a bug that the
conformance hasn't been implemented.


On Tue, Jul 25, 2017 at 8:03 PM, Angelo Villegas via swift-evolution <
swift-evolution at swift.org> wrote:

> I think this is a bug. Basing on other numeric types, the intended result
> would be the same for Int.
>
> On 26 Jul 2017, 7:40 AM +0800, Niels Andriesse via swift-evolution <
> swift-evolution at swift.org>, wrote:
>
> I'm +1 on this.
>
> On Mon, 24 Jul 2017 at 15:37 Niels Andriesse via swift-evolution <
> swift-evolution at swift.org> wrote:
>
>> And CustomStringConvertible (to String) is basically the inverse of
>> LosslessStringConvertible (from String).
>> On Mon, Jul 24, 2017 at 3:23 PM, Niels Andriesse <
>> andriesseniels at gmail.com> wrote:
>>
>>> Just want to point out that conforming Int to LosslessStringConvertible like
>>> this would mean assuming a radix of 10 in the implementation. That said,
>>> this would be consistent with the way Int implements CustomStringConvert
>>> ible, which also uses a radix of 10.
>>>
>>> On Mon, Jul 24, 2017 at 4:36 AM, David Sweeris via swift-evolution <
>>> swift-evolution at swift.org> wrote:
>>>
>>>>
>>>> On Jul 23, 2017, at 09:15, Matheus Martins via swift-evolution <
>>>> swift-evolution at swift.org> wrote:
>>>>
>>>> I came across what i think is an inconsistency in the standard library.
>>>>
>>>> Why are some numeric types like Int not conforming to
>>>> LosslessStringConvertible by default while Float and Double do conform to
>>>> it in the standard library?
>>>>
>>>> I came across this while trying to write some generic code:
>>>>
>>>> func array<T: LosslessStringConvertible>(_ text: String) -> [T?] {
>>>> return text.components(separatedBy: " ").map { T($0) }
>>>> }
>>>>
>>>> It seems rather inconsistent to me that that allows me to do:
>>>>
>>>> let floats: [Float] = array("1.0 2.2 3")
>>>>
>>>> but i can't do:
>>>>
>>>> let ints: [Int] = array("1 2 3 4 5 6")
>>>> "type 'Int' does not conform to protocol 'LosslessStringConvertible'"
>>>>
>>>> To further my point, Int is used as the sole example in the
>>>> LosslessStringConvertible docs: http://swiftdoc.org/v3.0/protocol/
>>>> LosslessStringConvertible/
>>>> Yet it does not actually conform to it.
>>>>
>>>> This seems way too basic for me to feel comfortable pitching it here,
>>>> but i searched and couldn't find any discussion on this on any mailing list
>>>> or website.
>>>>
>>>>
>>>> Sounds like it's a bug to me, either in the docs or stdlib, depending
>>>> on the intended behavior. Although I doubt they would've used Int in the
>>>> docs if they weren't intending Int to conform to it.
>>>>
>>>> - Dave Sweeris
>>>>
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>>>>
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