QtCore: Use Q_NULLPTR instead of 0 in all public headers

This is in preparation of adding -Wzero-as-null-pointer-constant (or similar)
to the headers check.

Task-number: QTBUG-45291
Change-Id: I0cc388ef9faf45cbcf425ad0dc77db3060c104a8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/corelib/thread/qmutex.h b/src/corelib/thread/qmutex.h
index 63c488747f..0c5a73b4df 100644
--- a/src/corelib/thread/qmutex.h
+++ b/src/corelib/thread/qmutex.h
@@ -73,16 +73,16 @@ public:
 
 private:
     inline bool fastTryLock() Q_DECL_NOTHROW {
-        return d_ptr.testAndSetAcquire(0, dummyLocked());
+        return d_ptr.testAndSetAcquire(Q_NULLPTR, dummyLocked());
     }
     inline bool fastTryUnlock() Q_DECL_NOTHROW {
-        return d_ptr.testAndSetRelease(dummyLocked(), 0);
+        return d_ptr.testAndSetRelease(dummyLocked(), Q_NULLPTR);
     }
     inline bool fastTryLock(QMutexData *&current) Q_DECL_NOTHROW {
-        return d_ptr.testAndSetAcquire(0, dummyLocked(), current);
+        return d_ptr.testAndSetAcquire(Q_NULLPTR, dummyLocked(), current);
     }
     inline bool fastTryUnlock(QMutexData *&current) Q_DECL_NOTHROW {
-        return d_ptr.testAndSetRelease(dummyLocked(), 0, current);
+        return d_ptr.testAndSetRelease(dummyLocked(), Q_NULLPTR, current);
     }
 
     void lockInternal() QT_MUTEX_LOCK_NOEXCEPT;