[swift-evolution] [Proposal Draft] Literal Syntax Protocols
Sean Heber
sean at fifthace.com
Tue Jun 28 22:39:15 CDT 2016
Arg. Dang it!
Syntax.ExpressibleAsIntegerLiteral
Syntax.FromIntegerLiteral
Syntax.IntegerLiteralManifestation
Syntax.GhostOfIntegerLiteral
Syntax.FormerlyKnownAsIntegerLiteral
l8r
Sean
Sent from my iPad
On Jun 28, 2016, at 10:29 PM, Erica Sadun <erica at ericasadun.com> wrote:
>> On Jun 28, 2016, at 9:21 PM, Sean Heber <sean at fifthace.com> wrote:
>>
>> IntegerLiteralExpressable?
>>
>> Does Apple employ any philosophers? We might need one...
>>
>> l8r
>> Sean
>>
>
> Aaaaaand...welcome to last night.
>
> The problem being, that people see this and think that the type can be
> expressed as an integer literal, not that an integer literal can be expressing
> the type. (I won't even bring up other associations for that word since
> most of the subscribers of this mailing list have not been nursing mothers
> although some may be familiar with the technique.)
>
> -- E
>
>
>>
>>> On Jun 28, 2016, at 10:02 PM, Erica Sadun <erica at ericasadun.com> wrote:
>>>
>>>
>>>> On Jun 28, 2016, at 8:08 PM, Sean Heber <sean at fifthace.com> wrote:
>>>>
>>>> What about..
>>>>
>>>> Syntax.ConvertibleFromIntegerLiteral
>>>> etc..
>>>
>>> I like it but Dave has already expressed that this isn't conversion. This
>>> is something distinct, magical, and more importantly, ineffable.
>>>
>>> He says it means an instance of the type can be written as a literal, and
>>> not converted from a literal. He writes:
>>>
>>>> Conformance to this protocol does *not* mean you can initialize the type with
>>>> a literal.
>>>>
>>>> Proof:
>>>>
>>>> func f<T: IntegerLiteralConvertible>() -> T {
>>>> return T(integerLiteral: 43) // Error
>>>> return T(43) // Also an Error
>>>> }
>>>>
>>>> It means an instance of the type can be *written* as a literal:
>>>>
>>>> func f<T: IntegerLiteralConvertible>() -> T {
>>>> return 43 // OK
>>>> }
>>>>>
>>>
>>> So we're looking at something more like:
>>>
>>> Syntax.AnIntegerLiteralCanBeSubstitutedForThisTypeAndTheCompilerWillNotBarf
>>>
>>> -- E
>>>
>>>
>
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