全局函数VS成员函数
1 #include <iostream> 2 3 using namespace std; 4 5 class Test 6 { 7 public: 8 Test(int a, int b) 9 { 10 this->a = a; 11 this->b = b; 12 } 13 int getA() 14 { 15 return a; 16 } 17 int getB() 18 { 19 return b; 20 } 21 22 Test add(Test &t2) 23 { 24 this->a = this->a + t2.getA(); 25 this->b = this->b + t2.getB(); 26 //return *this; 27 } 28 void print() 29 { 30 cout << "a = " << a << " b = " << b << endl; 31 32 } 33 protected: 34 private: 35 int a, b; 36 }; 37 38 Test add(Test &t1, Test &t2) 39 { 40 Test t3(t1.getA() + t2.getA(), t1.getB() + t2.getB()); 41 return t3; 42 } 43 44 int main() 45 { 46 Test t1(1, 2); 47 Test t2(2, 3); 48 //Test t3 = add(t1, t2); 49 t1.add(t2); 50 t1.print(); 51 52 system("pause"); 53 return 0; 54 }
成员函数隐藏了一个this指针,谁调用成员函数,this指针就指向谁,这个this指针就是指向调用成员函数的对象的首地址.
在成员函数里, *this 就是调用对象元素本身.一般用于return *this
