C++的指针

• C++可以定义-成员指针变量-（指向成员的指针，而不是指针型成员）
• 成员指针变量保存的是成员在结构体中的相对地址
• 成员指针的定义：
  • int Student::*mp = &Student::age;
• 成员指针的调用：
  • st.*mp = 18;
• 示例： ```cpp

  include

  include

  using namespace std;

struct Student{ int number; bool gender; int age; };

int main(int argc, char const *argv[]) { struct Student st = {1907201, 1, 18}; cout << st.number << endl;

int *p1 = &st.number;
bool *p2 = &st.gender;
int *p3 = &st.age;
cout << p1 << endl;
cout << p2 << endl;
cout << p3 << endl;
cout << "age : " << *p3 << endl;
cout << "成员指针变量" << endl;
int Student::*mp1 = &Student::number;
bool Student::*mp2 = &Student::gender;
int Student::*mp3 = &Student::age;
printf("%p\n", mp1);
printf("%p\n", mp2);
printf("%p\n", mp3);
cout << "age : " << st.*mp3 << endl;
return 0;

} ```