Bug 32363 – [Chromium] Disallow assignment of WebVector<T> to WebVector<T>

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Yury Semikhatsky]

As comment in the top part of WebVector.h says WebVector::swap should be used in such cases. If you write by mistake something as follows:

    WebVector<WebString> a(3);
    WebVector<WebString> b;
    b = a;

operator= automatically generated by compiler will be invoked as it takes precedence over template version
 
    template <typename C>
    WebVector<T>& operator=(const C& other)

The default assignment operator will lead to a.m_ptr == b.m_ptr and to destructor being called twice for the container elements. So either operator= should have valid implementation or be disallowed explicitly.

[Yury Semikhatsky]

Created attachment 44598 [details]
patch

Not sure where I could place unit test for this.

[WebKit Review Bot]

style-queue ran check-webkit-style on attachment 44598 [details] without any errors.

[Eric Seidel (no email)]

Comment on attachment 44598 [details]
patch

We have wtf/Noncopyable for this sort of thing.  But that can't be used here, so this is probably fine.

[Darin Fisher (:fishd, Google)]

Comment on attachment 44598 [details]
patch

Actually, the intent was to allow copying just as you can copy a std::vector or a WTF::Vector.  I think we should implement this assignment operator.

[Yury Semikhatsky]

Created attachment 44797 [details]
patch addressing reviewers comments

[WebKit Review Bot]

style-queue ran check-webkit-style on attachment 44797 [details] without any errors.

[Yury Semikhatsky]

(In reply to comment #4)
> (From update of attachment 44598 [details])
> Actually, the intent was to allow copying just as you can copy a std::vector or
> a WTF::Vector.  I think we should implement this assignment operator.
Done. I've added "non-template" operator=.

[Yury Semikhatsky]

Committing to http://svn.webkit.org/repository/webkit/trunk ...
	M	WebKit/chromium/ChangeLog
	M	WebKit/chromium/public/WebVector.h
Committed r52255