派生类方法隐藏基类方法

最新推荐文章于 2022-10-23 02:01:29 发布

原创最新推荐文章于 2022-10-23 02:01:29 发布 · 1.7k 阅读

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#methods #class

// Program that illustrates hiding of methods using inheritance.

class Base
{
public:
virtual void bar( ); // METHOD A
};

class Derived : public Base
{
public:
void bar( int x ); // METHOD B
};

void test( Base & arg1, Derived & arg2 )
{
    arg1.bar( );      // Compiles, as expected.
    arg1.bar( 4 );    // Does not compile, as expected.
    arg2.bar( 4 );    // Compiles, as expected.
    arg2.bar( );      // Does not compile. Not expected.

Base & tmp = arg2; tmp.bar( ); // Legal!!
}

int main( )
{
return 0;
}
为什么呢？

如果方法声明在派生类中，那么它将隐藏基类中所有具有相同名称的方法。