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Mon, 17 Dec 2018 11:27:32 -0800


> On Dec 17, 2018, at 11:10 AM, Chris Dumez <cdu...@apple.com> wrote:
> 
> 
> 
>> On Dec 17, 2018, at 10:27 AM, Alex Christensen <achristen...@apple.com 
>> <free online bettingmailto:achristen...@apple.com>> wrote:
>> 
>>>>>> On Dec 14, 2018, at 1:37 PM, Chris Dumez <cdu...@apple.com 
>>>>>> <mailto:cdu...@apple.com>> wrote:
>>>>> 
>>>>>> 
>>>>>> As far as I know, our convention in WebKit so far for our types has been 
>>>>>> that types getting moved-out are left in a valid ¡°empty¡± state.
>> This is not necessarily true.  When we move out of an object to pass into a 
>> function parameter, for example, the state of the moved-from object depends 
>> on the behavior of the callee.  If the callee function uses the object, we 
>> often have behavior that leaves the object in an ¡°empty¡± state of some kind, 
>> but we are definitely relying on fragile undefined behavior when we do so 
>> because changing the callee to not use the parameter changes the state of 
>> the caller.  We should never assume that WTFMove or std::move leaves the 
>> object in an empty state.  That is always a bug that needs to be replaced by 
>> std::exchange.
> 
> Feel like we¡¯re taking about different things. I am talking about move 
> constructors (and assignment operators), which have a well defined behavior 
> in WebKit. And it seems you are talking about WTFMove(), which despite the 
> name does not ¡°move¡± anything, it is merely a cast.
> In the case you¡¯re talking about the caller does NOT call the move 
> constructor, it merely does a cast so I do not think your comment invalidates 
> my statement. Note that in my patch, I was nearly WTFMove()ing the data 
> member and assigning it to a local variable right away, calling the move 
> constructor.

Also note that may of us already rely on our move constructors¡¯ behavior, just 
search for WTFMove(m_responseCompletionHandler) in:
https://trac.webkit.org/changeset/236463/webkit
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