学步园

复习重载、虚函数（覆盖、多态）、隐藏，方便理解：

class Base<br /> {<br /> public:<br /> virtual int A();<br /> int foo(void);<br /> int foo(int); // 重载函数foo()<br /> int a;<br /> protected:<br /> int B();<br /> int b;<br /> private:<br /> virtual int C();<br /> int C(Base* pBase);<br /> int c;<br /> public:<br /> Base* pbase;<br /> };<br /> int Base::A()<br /> {<br /> a = 1;<br /> return a;<br /> }<br /> int Base::B()<br /> {<br /> b = 2;<br /> return b;<br /> }<br /> int Base::C()<br /> {<br /> c = 3;<br /> return c;<br /> }<br /> int Base::C(Base* pBase)<br /> {<br /> // 可以访问pBase的所有属性成员函数<br /> // 包括protected和private属性成员函数<br /> return pBase->C(); // OK<br /> }<br /> class Derived: public Base<br /> {<br /> public:<br /> virtual int A(); // 虚函数、多态、覆盖<br /> int foo(double); // 隐藏基类函数foo()<br /> int a;<br /> protected:<br /> int B(); // 隐藏基类函数<br /> int b;<br /> int foo(long); // 隐藏基类函数foo()、该类内部的foo(double)构成重载关系<br /> private:<br /> virtual int C(); // 多态、覆盖、虚函数<br /> int C(Base* pBase);<br /> int c;<br /> public:<br /> Derived* pdrived;<br /> };<br /> int Derived::A()<br /> {<br /> a = 4;<br /> return a;<br /> }<br /> int Derived::B()<br /> {<br /> b = 5;<br /> return b;<br /> }<br /> int Derived::C()<br /> {<br /> c = 6;<br /> return c;<br /> }<br /> int Derived::C(Base* pBase)<br /> {<br /> // 只能访问pBase的public属性成员函数<br /> return pBase->A();<br /> }<br />