29 lines
637 B
C++
29 lines
637 B
C++
/**
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* @file first_example.cpp
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* @brief 虚函数中默认参数
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* 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！
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* @author 光城
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* @version v1
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* @date 2019-07-24
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*/
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#include <iostream>
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using namespace std;
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class Base {
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public:
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virtual void fun(int x = 10) { cout << "Base::fun(), x = " << x << endl; }
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};
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class Derived : public Base {
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public:
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virtual void fun(int x = 20) { cout << "Derived::fun(), x = " << x << endl; }
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};
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int main() {
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Derived d1;
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Base *bp = &d1;
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bp->fun(); // 10
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return 0;
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}
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