WinSDK samples: Workaround warnings for Clang on Windows.

Samples/multimedia/directshow/baseclasses/wxdebug.cpp

 //------------------------------------------------------------------------------
 // File: WXDebug.cpp
 //
 // Desc: DirectShow base classes - implements ActiveX system debugging
 //       facilities.
 //
 // Copyright (c) 1992-2001 Microsoft Corporation.  All rights reserved.
 //------------------------------------------------------------------------------
 
 
@@ skipping 1216 matching lines @@
 
         pf->Release();
 
         return;
     }
 
     IPin *pp;
     hr = pUnk->QueryInterface(IID_IPin, (void **)&pp);
     if(SUCCEEDED(hr))
     {
-        CDisp::CDisp(pp);
+        CDisp::CDisp(static_cast<IPin*>(pp));

[tommi, 2015/12/15 16:39:47]

hmm.. pp is already IPin*.  Why is this cast needed?

[kjellander_webrtc, 2015/12/15 17:57:55]

henrika@ and I were wondering that too. The compiler couldn't match any of the
available CDisp constructors without the cast. 
It kept complaining about that this line was trying to call a constructor with
no arguments.

         pp->Release();
         return;
     }
 }
 
 
 CDisp::~CDisp()
 {
 }
 
@@ skipping 217 matching lines @@
         
         pFilter->Release();
     }
 
     pFilters->Release();
 
 }
 
 #endif