深度探索C++ 对象模型(7)-Data member的布局(多重继承)

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• 多重继承
  

namespace ObjectMultiDerived {class Point2d {public:// has virtual functionsvirtual void print() {};private:float _x;float _y;};class Point3d : public Point2d {public:// ...private:float _z;};class Vertex {public:// has virtual functionsvirtual void print() {};private:Vertex* next;};class Vertex3d : public Point3d, public Vertex {public:// ...private:float mumble;}; void test(){ cout << "Point2d类、Point3d类、Vertex、Vertex3d类的大小:" << sizeof(Point2d) << " " << sizeof(Point3d) << " " << sizeof(Vertex) << " " << sizeof(Vertex3d) << endl;}
}
ObjectConDerived::test();//Point2d类、Point3d类、Vertex、Vertex3d类的大小:12 16 8 28

Vertex3d v3d; 
Point2d* p2d;
Point3d* p3d; //直接拷贝地址 
p2d = &v3d;
p3d = &v3d;//需要调整this指针的位置
Vertex* pv;
Vertex3d *pv3d;
pv = pv3d; //编译器伪码为：pv = (Vertex*) ( ((char*)pv3d) + sizeof(Point3d));
pv = &v3d; // 编译器伪码为：pv = (Vertex*) ( ((char*)&v3d) + sizeof(Point3d));

【引用】
[1]: <<深度探索C++ 对象模型 Inside The C++ Object Model >> Stanley B.Lippman 候捷 译
[2]: 代码地址 https://github.com/thefistlei/cplusStudy.git

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