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qml 怎把注册的实例标记指向 C＋＋不同的实例

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class Cust { };

Cust *c1 = new Cust();
Cust *c2 = new Cust();
Cust *c3 = new Cust();

engine.rootContext()->setContextProperty("cust",  c1);

那么我在一个 Cust.qml 怎样把 cust 切换到指向 c2, c3 ?