C++简明图解this指针的使用

class Data
{
public:
    int m_num;
 
    void setNum(int num)
    {
        m_num = num;
    }
};
void test01()
{
    Data ob1;
    ob1.setNum(10);
    cout<<"ob1.m_num = "<<ob1.m_num<<endl;
    Data ob2;
    ob2.setNum(20);
    cout<<"ob2.m_num = "<<ob2.m_num<<endl;
    Data ob3;
    ob3.setNum(30);
    cout<<"ob3.m_num = "<<ob3.m_num<<endl;
}

class Data
{
public:
    int m_num;
    void setNum(int num)
    {
        //m_num = num;
        this->m_num = num;
    }
};
void test01()
{
    Data ob1;
    ob1.setNum(10);
    cout<<"ob1.m_num = "<<ob1.m_num<<endl;
    Data ob2;
    ob2.setNum(20);
    cout<<"ob2.m_num = "<<ob2.m_num<<endl;
    Data ob3;
    ob3.setNum(30);
    cout<<"ob3.m_num = "<<ob3.m_num<<endl;
}

class Data
{
public:
    int num;
    //形参 和成员名相同
    void setNum(int num)
    {
        //形参num
        //成员num  this->num
        //num= num;//就近原则 形参num 赋值给 形参num
        this->num = num;
        //将形参num 赋值给 对象中成员num
    }
};

class MyCout
{
public:
    MyCout& myCout(char *str)
    {
        cout<<str;
        return *this;//*this 代表就是 当前调用该函数的对象
    }
};
int main(int argc, char *argv[])
{
    MyCout ob;
    /*
    ob.myCout("hehe");
    ob.myCout("haha");
    ob.myCout("xixi");*/
    ob.myCout("hehe").myCout("haha").myCout("xixi");//ob.myCout("hehe") == ob
    return 0;
}

class Data
{
public:
    int a;//4B
public:
    void setA(int a)
    {
        this->a = a;
        return;
    }
    int getA(void)
    {
        return this->a;
    }
};

class Printf
{
public:
    Printf& myPrint(int value)
    {
        cout<<value<<" ";
        //*this ==外界的对象
        return *this;
    }
};
void test01()
{
    Printf ob;
    ob.myPrint(10).myPrint(20).myPrint(30).myPrint(40);
    cout<<endl;
}