[webkit-dev] Should we ever use std::function instead of WTF::Function?
achristensen at apple.com
Tue Jun 13 12:37:49 PDT 2017
Ok, maybe we can get rid of std::function, then! I hadn’t used BlockPtr as much as Chris. I’d be opposed to adding a copy constructor to WTF::Function because the non-copyability of WTF::Function is why we made it, and it has prevented many bugs.
I’ve also seen many cases where I have a WTF::Function that I want to make sure is called once and only once before destruction. I wouldn’t mind adding a WTF::Callback subclass that just asserts that it has been called once. That would’ve prevented some bugs, too, but not every use of WTF::Function has such a requirement.
> On Jun 13, 2017, at 12:31 PM, Chris Dumez <cdumez at apple.com> wrote:
> We already have BlockPtr for passing a Function as a lambda block.
> Chris Dumez
> On Jun 13, 2017, at 12:29 PM, Alex Christensen <achristensen at apple.com <mailto:achristensen at apple.com>> wrote:
>> std::function, c++ lambda, and objc blocks are all interchangeable. WTF::Functions cannot be used as objc blocks because the latter must be copyable. Until that changes or we stop using objc, we cannot completely eliminate std::function from WebKit.
>> webkit-dev mailing list
>> webkit-dev at lists.webkit.org <mailto:webkit-dev at lists.webkit.org>
>> https://lists.webkit.org/mailman/listinfo/webkit-dev <https://lists.webkit.org/mailman/listinfo/webkit-dev>
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