摘要：
class Class3{public: Class3(); virtual ~Class3(); Class4 *c4;};class Class4{public: Class4(); virtual ~Class4();}; 阅读全文
摘要：
class C1{public: C1(); virtual ~C1(); C2 *theC2;};class C2{public: C2(); virtual ~C2(); C1 *theC1;}; 阅读全文