过程式析构:
测试案例:test.cpp
#include <iostream> using namespace std; class Test { public: Test(int dt=0){data=dt;} ~Test(){cout<<data<<endl;} private: int data; }; int w(void) { Test b(7); Test c(8); } int main(int argc,char **argv) { Test a(0); if(1==1) {Test a(1);Test b(2);} w(); if(1==1) {Test a(3);Test b(4);} Test c(5); return 0; }
程序结果:2 1 8 7 4 3 5 0
假设结论(析构时候顺序): 1.正序析构包含函数块 2.反序析构包含对象
对象式析构:
测试案例:test2.cpp
#include <iostream> using namespace std; class Test { public: Test(int dt=0){data=dt;cout<<data<<":construct"<<endl;} ~Test(){cout<<data<<":desctruct"<<endl;} private: int data; }; class Test2 { public: Test2(int dt=0):a(1),b(2){data=dt;} ~Test2(){cout<<data<<":Test2"<<endl;} private: int data; Test a; Test b; static Test c; static Test d; }; Test Test2::c(3); Test Test2::d(4); int main(int argc,char **argv) { Test2 e; return 0; }
程序结果:
3:construct
4:construct
1:construct
2:construct
0:Test2
2:desctruct
1:desctruct
4:desctruct
3:desctruct
假设结论(析构顺序):先析构自己,再析构普通成员对象 定义的反序,再析构static对象 定义的反序