[swift-evolution] Required Callback

[Boris Wang]

Why the callback is special ?

The compiler should has a warning for unused parameters of function.

I think this is enough. More works should be leaved for a lint tool.


James Campbell via swift-evolution <swift-evolution at swift.org>于2016年8月17日
周三06:39写道：

> ​I'm not sure about that last question, I guess someone who knows more
> about it than me could answer.​
>
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> On 16 August 2016 at 23:37, James Campbell <james at supmenow.com> wrote:
>
>> @noescape is a hint that the callback will only be called once and allows
>> compiler to optimise, we may or may not be able to combine @required
>> functionality into that but it looks like it was rejected for now.
>>
>> @required is a compiler hint / sanity check to enforce that the callback
>> is actually called once by the developer. There is no focus on any compiler
>> enhancements other than that.
>> ​
>>
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