C++調用順序

1. 基類構造函數被調用的順序以類派生表中聲明的順序爲準.
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;
}

輸出內容爲:

E::E()

A::A() calledB::B() calledF::F()

2.  在含有基類、初始化成員函數的構造函數的調用順序，基類最先調用->其次是成員初始化列表按照聲明順序進行調用->然後是成員類變量構造函數->本類的構造函數