2010-12-27 Jake Helfert <jake@jakeonthenet.com>

2010-12-27  Jake Helfert  <jake@jakeonthenet.com>

        Reviewed and reworked by Darin Adler.

        Building WebKit with Visual Studio 2010 fails due
        to ambiguous assignment operator errors.
        https://bugs.webkit.org/show_bug.cgi?id=51116

        * wtf/NullPtr.h: Added a HAVE(NULLPTR) definition for use with
        Platform.h HAVE macro, and included the Visual Studio 2010 compiler
        as one of the ones that has nullptr.
        * wtf/NullPtr.cpp: Updated condition to match.

        * wtf/PassOwnArrayPtr.h: Don't include the operator=(nullptr_t)
        overload if we are compiling in loose mode and the compiler has
        nullptr, because assignment of 0 will otherwise encounter
        ambiguitity with this overload and the overload for loose mode
        that takes a raw pointer. The conditional can be removed when we
        get rid of loose mode.
        * wtf/PassOwnPtr.h: Ditto.

        * wtf/PassRefPtr.h: Don't include the operator=(nullptr_t) overload
        if the compiler has nullptr, because assignment of 0 would be
        ambiguous with the overload that takes a raw pointer. The conditional
        can be removed if we ever decide we no longer need to support
        assigning 0, but might need a way to catch that usage on older compilers.
        * wtf/RefPtr.h: Ditto.
        * wtf/RetainPtr.h: Ditto

        * JavaScriptCore.xcodeproj/project.pbxproj: Added NullPtr.cpp,
        accidentally omitted when the file was first added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@74695 268f45cc-cd09-0410-ab3c-d52691b4dbfc