40 lines
752 B
C++
40 lines
752 B
C++
/**
|
|
* @file first_example.cpp
|
|
* @brief 虚函数中默认参数
|
|
* 规则：虚函数是动态绑定的，默认参数是静态绑定的。默认参数的使用需要看指针或者应用本身的类型，而不是对象的类型！
|
|
* @author 光城
|
|
* @version v1
|
|
* @date 2019-07-24
|
|
*/
|
|
|
|
#include <iostream>
|
|
using namespace std;
|
|
|
|
class Base
|
|
{
|
|
public:
|
|
virtual void fun ( int x = 10 )
|
|
{
|
|
cout << "Base::fun(), x = " << x << endl;
|
|
}
|
|
};
|
|
|
|
class Derived : public Base
|
|
{
|
|
public:
|
|
virtual void fun ( int x=20 )
|
|
{
|
|
cout << "Derived::fun(), x = " << x << endl;
|
|
}
|
|
};
|
|
|
|
|
|
int main()
|
|
{
|
|
Derived d1;
|
|
Base *bp = &d1;
|
|
bp->fun(); // 10
|
|
return 0;
|
|
}
|
|
|