> volumn one chapter 14

iteye_1315

于 2010-01-15 22:04:00 发布

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本文通过一个C++示例程序演示了派生类构造函数及析构函数的调用顺序，展示了如何使用公共基类和多个成员对象时构造与析构的过程。通过输出到文件的方式记录了构造函数与析构函数的调用顺序。

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//:order.cpp #include<iostream> #include<fstream> using namespace std; ofstream out("order.out"); #define CLASS(ID) class ID{/ public:/ ID(int ){out<< #ID" constructor/n";}/ ~ID(){out<<#ID" destructor/n";}/ }; CLASS (Base1); CLASS (Member1); CLASS (Member2); CLASS (Member3); CLASS (Member4); class Derived1: public Base1{ Member1 m1; Member2 m2; public: Derived1(int): m2(1),m1(2),Base1(3){ out<<"Derived1 constructor!"<<endl; } ~Derived1(){ out<<"Derived1 destructor!"<<endl; } }; class Derived2:public Derived1{ Member3 m3; Member4 m4; public: Derived2(): m3(1),m4(2),Derived1(3){ out<<"Derived2 constructor!"<<endl; } ~Derived2(){ out<<"Derived2 destructor!"<<endl; } }; int main(){ Derived2 d2; }