[webkit-dev] Using "auto <function()> -> returnType" breaks prepare-ChangeLog

[Sam Weinig]

> On Jul 28, 2017, at 11:13 AM, Maciej Stachowiak <mjs at apple.com> wrote:
> 
> 
> 
>> On Jul 28, 2017, at 10:58 AM, Sam Weinig <weinig at apple.com <mailto:weinig at apple.com>> wrote:
>> 
>> 
>> 
>>> On Jul 28, 2017, at 10:31 AM, JF Bastien <jfbastien at apple.com <mailto:jfbastien at apple.com>> wrote:
>>> 
>>> 
>>> 
>>>> On Jul 28, 2017, at 10:29, Sam Weinig <weinig at apple.com <mailto:weinig at apple.com>> wrote:
>>>> 
>>>> For some generic programming, this form can be dramatically shorter:
>>>> 
>>>> e.g. 
>>>> 
>>>> template<typename KeyArg, typename MappedArg, typename HashArg, typename KeyTraitsArg, typename MappedTraitsArg>
>>>> template<typename K, typename V>
>>>> ALWAYS_INLINE auto HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg>::inlineAdd(K&& key, V&& value) -> AddResult
>>>> {
>>>>     return m_impl.template add<HashMapTranslator<KeyValuePairTraits, HashFunctions>>(std::forward<K>(key), std::forward<V>(value));
>>>> }
>>>> 
>>>> vs.
>>>> 
>>>> template<typename KeyArg, typename MappedArg, typename HashArg, typename KeyTraitsArg, typename MappedTraitsArg>
>>>> template<typename K, typename V>
>>>> ALWAYS_INLINE typename HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg>::AddResult HashMap<KeyArg, MappedArg, HashArg, KeyTraitsArg, MappedTraitsArg>::inlineAdd(K&& key, V&& value)
>>>> {
>>>>     return m_impl.template add<HashMapTranslator<KeyValuePairTraits, HashFunctions>>(std::forward<K>(key), std::forward<V>(value));
>>>> }
>>>> 
>>>> It is also the only format available for lambdas, so people are probably getting used to it.
>>>> 
>>>> Not sure it’s worth it to avoid it.
>>> 
>>> Agreed.
>>> 
>>> That being said, I’m not volunteering to fix the parser’s handling of lambdas. At that point we should really consider using clang’s AST.
>> 
>> I absolutely agree. For this and the style checker, it’s probably time to migrate to clang tooling.
> 
> Using a real parser is probably a good idea at some point.
> 
> But I am not sure it's necessary for prepare-ChangeLog to know about the boundaries for lambdas. It's goal is to list all named functions that the local changes have modified. For modifications to the body or signature of a lambda, naming the function that contains the lambda is probably the most useful option. I think that already works as expected.
> 

I didn’t mean to imply that we should have lambdas in ChangeLogs, only that people were probably getting used to that syntax. Sorry for the confusion.

-Sam

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