> Le 9 janv. 2018 à 18:18, Nate Cook <natec...@apple.com> a écrit :
>
>> On Jan 9, 2018, at 11:00 AM, Gwendal Roué via swift-evolution
>> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
>>
>>>
>>> Le 9 janv. 2018 à 17:16, Zach Waldowski via swift-evolution
>>> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> a écrit :
>>>
>>> I'm not sure a valid use case by a third party makes it hold its weight for
>>> inclusion in the stdlib.
>>
>> You're definitely right, and that's why I wrote with the most humble tone I
>> could.
>>
>> Yet, the design of the stdlib *requires* some speculation about use cases,
>> and speculation is *helped* by the exposition of actual uses. I'm not sure
>> readers of the mailing list had any idea of the use cases of the current
>> DictionaryLiteral, and maybe I helped a little.
>>
>>> Reproducing its feature set is extremely trivial, and would probably allow
>>> you to hint the implementation details better for your use case.
>>
>> Please define "trivial”.
>>
>> In case anybody would wonder, in the line below the `row` variable is of
>> type Row which happens to adopt ExpressibleByDictionaryLiteral. It is not of
>> type DictionaryLiteral. The use case here is the ability to express a row
>> with a dictionary literal that accepts duplicated keys and preserves
>> ordering:
>>
>> XCTAssertEqual(row, ["a": 1, "a": 2])
>
> That’s great! In this case you aren’t using the DictionaryLiteral type, but a
> “dictionary literal”, which no one is suggesting we remove.
You're right ! I was almost sure that ExpressibleByDictionaryLiteral
initializer would eat a DictionaryLiteral, but it doesn't!
extension Row : ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (String,
DatabaseValueConvertible?)...) { ... }
}
This code has been written too long ago. I have been mislead, I'd like to
apologize.
> If I’m understanding what you wrote, this is another case where the terrible
> name is making it super hard to discuss what we’re talking about. “Dictionary
> literals” and the ExpressibleByDictionaryLiteral protocol are safe!
Yes, I have been bitten hard by the names! Time for bikeshedding indeed :-)
Gwendal
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