本文讨论下面这种情况,指针指向的东西是啥:
(如果base是父类,Derived是派生类,那么base* (Derived)这种指针究竟指向了啥?
1.定义代码:
#include "iostream" using namespace std; class base1{ public: base1():base1_1(11){} int base1_1; virtual void base1_fun1(){ cout<<"base_fun1"<2.main代码:
int main(){ Derived d1; base1* ptr1 = &d1; base2* ptr2 = &d1; base3* ptr3 = &d1; Derived* ptr4 = &d1; ptr1->base1_fun1();//1 ptr3->base3_fun1(); ptr4->base1_fun1(); ptr4->base3_fun1(); ptr4->derived_fun1(); cout<<&d1<<" "; cout<3.结果
4.结论
Derived d1; base1* ptr1 = &d1; base2* ptr2 = &d1; base3* ptr3 = &d1; Derived* ptr4 = &d1;我觉得种种迹象表明
base1指针指向派生类d1的话,实际上是只会看到base1的虚函数,也只会看到base1的构造函数出来的东西。
Derived指针的话,啥都能看到。欢迎分享,转载请注明来源:内存溢出
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