C++调用顺序

1. 基类构造函数被调用的顺序以类派生表中声明的顺序为准.
class A
{
public:
    A()
    {
        cout << "A::A() called" << endl;
        num = 10;
    }

    void showMsg()
    {
        cout << "A::showMsg() called" << endl;
    }
protected:
    void showMsg2()
    {
        cout << "A::showMsg2() called" << endl;
    }
private:
    int num;
};

class B:private A
{
public:
    B()
    {
        cout << "B::B() called" << endl;
    }

    void showMsgB()
    {
        cout << "B::showMsgB()" << endl;
    }

    void showMsgB2()
    {
        showMsg2();
    }
};
class E
{
public:
    E()
    {
        cout << "E::E()" << endl;
    }
};

class F:public E, public B
{
public:
    F()
    {
        cout << "F::F()" << endl;
    }
};

...
int main(void)
{
      F f;
    return 0;
}

输出内容为:

E::E()

A::A() calledB::B() calledF::F()
2.  在含有基类、初始化成员函数的构造函数的调用顺序，基类最先调用->其次是成员初始化列表按照声明顺序进行调用->然后是成员类变量构造函数->本类的构造函数