一个小例子，说明类的几大函数：
#include <iostream>
using namespace std;
class c_test{
public:
c_test();
c_test(int para_a=3,string str="original");
c_test(const c_test & other);
~c_test(void);
c_test & operator =(const c_test & other);
private:
string name;
int num;
};
c_test::c_test(){
}
c_test::c_test(int para_a,string str){
this->num=para_a;
this->name=str;
cout<<"I am in constructor, my name is "<<this->name<<", my value is "<<this->num<<endl;
}
c_test::c_test(const c_test & other){
this->num=other.num;
this->name=other.name+" copy";
cout<<"I am in copy constructor, my name is "<<this->name<<", my value is "<<this->num<<endl;
}
c_test & c_test::operator=(const c_test & other){
this->num=other.num;
this->name=other.name;
cout<<"I am in operator =, my name is "<<this->name<<", my value is "<<this->num<<endl;
return *this;
}
c_test::~c_test(void){
cout<<"I am in destructor, my name is "<<this->name<<", my value is "<<this->num<<endl;
}
main(){
int a;
int b;
c_test obj_a(3,"a");
c_test obj_b(obj_a);//调用拷贝构造函数
c_test * p_a=new c_test(333,"s");
c_test * p_b=new c_test(2,"b");
*p_a=obj_a;//调用赋值函数
printf("0X%08X\n",&a);
printf("0X%08X\n",&b);
printf("0X%08X\n",p_a);
delete p_b;
}
