Connection guard, only valid signal connections will be added

src/blackmisc/connectionguard.cpp

@@ -17,14 +17,22 @@ namespace BlackMisc
         m_connections.append(connection);
     }
 
-    void CConnectionGuard::append(const QMetaObject::Connection &connection)
+    bool CConnectionGuard::append(const QMetaObject::Connection &connection)
     {
+        if (!connection) { return false; }
         m_connections.append(connection);
+        return true;
     }
 
-    void CConnectionGuard::append(const QList<QMetaObject::Connection> &connections)
+    bool CConnectionGuard::append(const QList<QMetaObject::Connection> &connections)
     {
-        m_connections.append(connections);
+        int c = 0;
+        for (const QMetaObject::Connection &connection : connections)
+        {
+            if (!connection) { continue; }
+            if (this->append(connection)) { c++; }
+        }
+        return c > 0;
     }
 
     CConnectionGuard::~CConnectionGuard()

src/blackmisc/connectionguard.h

@@ -50,10 +50,10 @@ namespace BlackMisc
         ~CConnectionGuard();
 
         //! Add connection
-        void append(const QMetaObject::Connection &connection);
+        bool append(const QMetaObject::Connection &connection);
 
         //! Add connections
-        void append(const QList<QMetaObject::Connection> &connections);
+        bool append(const QList<QMetaObject::Connection> &connections);
 
         //! Disconnect all
         int disconnectAll();
@@ -61,6 +61,6 @@ namespace BlackMisc
     private:
         QList<QMetaObject::Connection> m_connections;
     };
-} // BlackMisc
+} // ns
 
 #endif