Add a move constructor and move assignment operator to Deque

[Anders Carlsson]

Add a move constructor and move assignment operator to Deque

[Anders Carlsson]

Created attachment 246539 [details]
Patch

[Anders Carlsson]

Committed r180066: <http://trac.webkit.org/changeset/180066>

[Darin Adler]

Comment on attachment 246539 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=246539&action=review

> Source/WTF/wtf/Deque.h:327
>  template<typename T, size_t inlineCapacity>
> +inline auto Deque<T, inlineCapacity>::operator=(Deque&& other) -> Deque&
> +{
> +    swap(other);
> +    return *this;
> +}

This isn’t right. We need to clear other after swapping, I think.

[Darin Adler]

Comment on attachment 246539 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=246539&action=review

> Tools/TestWebKitAPI/Tests/WTF/Deque.cpp:182
> +    EXPECT_EQ(10u, deque2.size());

That doesn’t seem right. deque2’s size should be zero.

[Anders Carlsson]

(In reply to comment #3)
> Comment on attachment 246539 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=246539&action=review
> 
> > Source/WTF/wtf/Deque.h:327
> >  template<typename T, size_t inlineCapacity>
> > +inline auto Deque<T, inlineCapacity>::operator=(Deque&& other) -> Deque&
> > +{
> > +    swap(other);
> > +    return *this;
> > +}
> 
> This isn’t right. We need to clear other after swapping, I think.

Move constructors don't have to clear out the original; they only need to leave the moved-from object in a valid (but indeterminate) state.