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class person
{
public:
person(int age,int height)
{
m_age=age;
m_height=new int(height);//new一个堆区接受外来值与成员变量地址一致
cout<<"有参构造函数"<<endl;
}
~person()//析构函数将堆区的数据释放
{
if(m_height!=NULL)
{
delete m_height;
m_height=NULL;
}
cout<<"析构函数"<<endl;
}
int m_age;
int *m_height;
};
void text01()
{
person p1(10,20);
cout<<"年龄为"<<p1.m_age<<"身高为"<<p1.m_height<<endl;
person p2(p1);
cout<<"年龄为"<<p2.m_age<<"身高为"<<p2.m_height<<endl;
}
int main()
text01(); -
当调用析构函数时由于，p2的拷贝函数和p2的构造函数同时对同一份地址进行析构产生错误
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修改系统自动给出的拷贝构造，在有参构造下应自己实现拷贝构造函数
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//深拷贝
person(const person *p)
{
//m_height=p.m_height;系统自动给出
m_height=new int (*p.m_height);
}
初始化列表
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class person
{
public:
person(int a,int b,int c):m_a(a),m_b(b),m_c(c)
{}
int m_a;
int m_b;
int m_c;
};
void text01()
{
person p(10,25,66);
cout<<p.m_a<<p.m_b<<p.m_c<<endl;
}
int main()
text01(); -
类对象作为类成员
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class phone
{
public:
phone(string pname)
{
m_pname=pname;
}
string m_pname;
};
class person
{
public:
person(string name,string pname):m_name(name),m_pname(pname)
{}
string m_name;
phone m_pname;
};
void test()
{
person p("小子","苹果max");
cout<<"姓名"<<p.m_name<<"手机为"<<p.m_pname.m_pname<<endl;
}
int main()
{
test();
}
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静态成员
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class person
{
public:
static int age;//类内声明
private:
};
int person::age=10;// 类外初始化
void text01()
{
//用对象进行访问
person p1;
cout<<p1.age<<endl; //输出的结果是10
person p2;
cout<<p2.age<<endl;//输出的结果是10
//通过类名进行访问
cout<<person::age<<endl;
}
int main()
{
text01();
system("pause");
return 0;
} -
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