//內存單元地址分配、構造 的順序與繼承的順序有關 #include <iostream> #include <string> using namespace std;class A { public:int m_a;~A(){cout << "~~A" << endl;} };class A1 :virtual public A { public:int m_a1;A1(int a1){m_a1 = a1;cout << "A1" << endl;}~A1(){cout << "~~A1" << endl;}};class A2 :virtual public A { public:int m_a2;A2(int a2){m_a2 = a2;cout << "A2" << endl;}~A2(){cout << "~~A2" << endl;} };class C :public A1,public A2 { public:int m_c;C(int c) : A1(c), A2(c){m_c = c;cout << "CCCCCCCCC" << endl;}~C(){cout << "~~CCCCCCCCC" << endl;} };int main() {C c1(1);cout << sizeof(c1) << endl; cout << "&c1 = " << &c1 << endl;cout << "&c1.A1::m_a " << &c1.A1::m_a << endl;cout << "&c1.m_a1 = " << &c1.m_a1 << endl;cout << "&c1.A2::m_a " << &c1.A2::m_a << endl;cout << "&c1.m_a2 = " << &c1.m_a2 << endl;cout << "&c1.m_c = " << &c1.m_c << endl;//虛繼承就是把 父類里的變量的地址分配 往后放， 先分配自己的地址cout << "虛繼承就是把 父類里的變量的地址分配 往后放， 先分配自己的地址" << endl;cout << "&c1.m_a1 = " << &c1.m_a1 << endl;cout << "&c1.m_a2 = " << &c1.m_a2 << endl;cout << "&c1.m_c = " << &c1.m_c << endl;cout << "&c1.A1::m_a " << &c1.A1::m_a << endl;cout << "&c1.A2::m_a " << &c1.A2::m_a << endl;//對應的虛繼承在其最前面分配一個指針(占四個字節) 指向 虛繼承來的變量地址（在最后面）system("pause");return 0; } #include <iostream>using namespace std;class A { private:int m_a; public :A(){cout << "A constuctor" << endl;}void print(){cout << "AAAAAAAAA" << endl;} };class B :public A { private:int m_b; public:B(){cout << "B constuctor" << endl;}void print(){cout << "BBBBBBBB" << endl;} };int main() {A a1;B b1;a1 = b1;A *p1 = new A;//父類指針指向父類對象A *p2 = new B;//父類指針只愛想子類對象（向下轉型）p2->print();B *p3 = new B;//子類指針指向子類對象system("pause");return 0; }

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