19笔试真题：看程序写结果，含有内嵌对象的类的构造函数调用次序

看程序写结果，含有内嵌对象的类的构造函数调用次序

#include <iostream>
using namespace std;

class Student1{
public:
    Student1() {cout << "Student1+" << endl; }
    ~Student1() { cout << "-Student1" << endl; }
};

class Student2{
public:
    Student2() {cout << "Student2+" << endl; }
    ~Student2() { cout << "-Student2" << endl; }
};

class Teacher{
public:
    Teacher()  {cout << "Teacher+" << endl;}
    ~Teacher() { cout << "-Teacher" << endl; }
private:
    Student2 stu2;
    Student1 stu1;
};

int main(){
    Teacher t;
    return 0;
}

结果表明，先按照类成员的声明次序调用相应类的构造函数

Student2+
Student1+
Teacher+
-Teacher
-Student1
-Student2