Bug 131006 – std::bind not compiling with Visual Studio

• Component: Web Template Framework
• Status: RESOLVED FIXED

[Alex Christensen]

I'm getting lots of compile errors like this when compiling after r166496 and I'm trying to avoid adding template parameters everywhere.  This is a shot-in-the dark solution.


1>..\platform\graphics\gstreamer\WebKitWebSourceGStreamer.cpp(745): error C2668: 'WTF::GMainLoopSource::schedule' : ambiguous call to overloaded function
                 C:\Projects\BuildSlave\win-cairo-release\build\WebKitBuild\Release_WinCairo\include\private\wtf/gobject/GMainLoopSource.h(55): could be 'void WTF::GMainLoopSource::schedule(const char *,std::function<bool (GIOCondition)>,GSocket *,GIOCondition,std::function<void (void)>,GMainContext *)'
                 C:\Projects\BuildSlave\win-cairo-release\build\WebKitBuild\Release_WinCairo\include\private\wtf/gobject/GMainLoopSource.h(54): or       'void WTF::GMainLoopSource::schedule(const char *,std::function<bool (void)>,int,std::function<void (void)>,GMainContext *)'
                 C:\Projects\BuildSlave\win-cairo-release\build\WebKitBuild\Release_WinCairo\include\private\wtf/gobject/GMainLoopSource.h(53): or       'void WTF::GMainLoopSource::schedule(const char *,std::function<void (void)>,int,std::function<void (void)>,GMainContext *)'
                 while trying to match the argument list '(const char [32], std::_Bind<true,void,void (__cdecl *const )(WebKitWebSrc *),WebKitWebSrc *&>, int, webKitWebSrcSeekDataCb::<lambda_d0654a0fb2d903f9cc92bf36e3e47024>)'

[Alex Christensen]

Created attachment 228236 [details]
Patch

[Alex Christensen]

Created attachment 228238 [details]
Patch

[Carlos Garcia Campos]

Comment on attachment 228238 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=228238&action=review

We use the versions with the bool function to decide whether to use g_idle or g_timeout, if you remove the versions receiving a bool function it's impossible to implement a repeating source. I guess the problem with visual studio is that the compiler doesn't know which one to use, so a possible workaround would be to add a cast in the callers, see the discussion here: https://bugs.webkit.org/show_bug.cgi?id=130027#c15

> Source/WTF/ChangeLog:4
> +        [WinCairo] Build fix after r166496.
> +        https://bugs.webkit.org/show_bug.cgi?id=131006

Removing the code that doesn't build for you is not a build fix :-)

[Alex Christensen]

> Removing the code that doesn't build for you is not a build fix :-)
That's why it was a shot in the dark.  I was just hoping that nobody would ever need to use the bool version :)

I added some std::function<void ()> constructors.  I was going to add static_casts, but I think this is a better solution.

[Alex Christensen]

Created attachment 228311 [details]
Patch

[Carlos Garcia Campos]

Comment on attachment 228311 [details]
Patch

Thanks for confirming that was indeed the problem, and sorry for the build break.

[WebKit Commit Bot]

Comment on attachment 228311 [details]
Patch

Clearing flags on attachment: 228311

Committed r166643: <http://trac.webkit.org/changeset/166643>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.