explicit operator bool for CFX_RetainPtr and CFX_CountRef

core/fxcrt/include/cfx_retain_ptr.h

Index: core/fxcrt/include/cfx_retain_ptr.h
diff --git a/core/fxcrt/include/cfx_retain_ptr.h b/core/fxcrt/include/cfx_retain_ptr.h
index 25edd585cb454d2fb5f91c33c8f397ad0e2071f9..e40feb6b31c765ad56a0fc31495991364f9b0daa 100644
--- a/core/fxcrt/include/cfx_retain_ptr.h
+++ b/core/fxcrt/include/cfx_retain_ptr.h
@@ -46,7 +46,7 @@ class CFX_RetainPtr {
 
   bool operator!=(const CFX_RetainPtr& that) const { return !(*this == that); }
 
-  operator bool() const { return !!m_pObj; }
+  explicit operator bool() const { return !!m_pObj; }
   T& operator*() const { return *m_pObj.get(); }
   T* operator->() const { return m_pObj.get(); }