添加深度探索c++对象模型代码

Inside-The-CPP-Object-Model/object-lessons.cpp

@@ -0,0 +1,120 @@
+#include <iostream>
+#include <cstdio>
+using namespace std;
+
+// c语言实现
+#define DPoint3d_print(pd) printf("%g, %g, %g\n", pd->x, pd->y, pd->z);
+
+typedef struct point3d{
+    float x, y, z;
+} Point3d;
+
+void Point3d_print(const Point3d *pd) {
+    printf("%g, %g, %g\n", pd->x, pd->y, pd->z);
+}
+
+// C++实现
+// 成员函数并不出现在class object中
+class Point3dCPP {
+public:
+    Point3dCPP(float x = 0.0, float y = 0.0, float z = 0.0): _x(x), _y(y), _z(z){};
+    float getX() const {return _x;};
+    float getY() const {return _y;};
+    float getZ() const {return _z;};
+private:
+    float _x, _y, _z;
+};
+
+inline ostream& operator<< (ostream &os, const Point3dCPP &pd) {
+    return os << "(" << pd.getX() << ", " 
+            << pd.getY() << ", " << pd.getZ() << ")";
+}
+
+// C++继承
+class Point {
+public:
+    Point(float x): _x(x) {};
+    float getX() const {return _x;};
+private:
+    float _x;
+};
+
+class Point2d : public Point {
+public:
+    Point2d(float x, float y): Point(x), _y(y) {};
+private:
+    float _y;
+};
+
+class Point3dOO: public Point2d {
+public:
+    Point3dOO(float x, float y, float z): Point2d(x, y), _z(z) {};
+    float getZ() const {return _z;};
+private:
+    float _z;
+};
+
+inline ostream& operator<< (ostream &os, const Point3dOO &pd) {
+    return os << "(" << pd.getZ() << ")";
+}
+
+// C++ 模板
+template<typename T>
+class Point3dT {
+public:
+    Point3dT(T x, T y, T z): _x(x), _y(y), _z(z) {};
+    T getX() const {return _x;};
+    T getY() const {return _y;};
+    T getZ() const {return _z;};
+private:
+    T _x, _y, _z;
+};
+
+// C++ 模板
+template<typename T, int dim>
+class Point3dV {
+public:
+    Point3dV(T coords[dim]) {
+        for(int i = 0; i < dim; i++) {
+            _coords[i] = coords[i];
+        }
+    }
+
+    T operator[](int i) const{
+        assert(i<dim&&i>=0);
+        return _coords[i];
+    }
+
+private:
+    T _coords[dim];
+};
+
+template<typename T, int dim> 
+inline ostream& operator<< (ostream &os, const Point3dV<T, dim> &pt) {
+    os << "(";
+    for(int i = 0; i < dim-1; i++){
+        os << pt[i] << ", ";
+    }
+    os << pt[dim-1];
+    os << ")";
+    return os;
+}
+
+int main() {
+    // #1 C语言风格
+    Point3d p3d = {1,2,3};
+    Point3d_print(&p3d);
+
+    // #2 CPP
+    Point3dCPP p3dcpp(4,5,6);
+    cout << p3dcpp << endl;
+
+    // #3 C++继承
+    Point3dOO p3doo(7,8,9);
+    cout << p3doo << endl;
+
+    // #4 C++模板
+    int coord[2] = {10, 11};
+    Point3dV<int, 2> p3dv(coord);
+    cout << p3dv << endl;
+}

README.md

@@ -17,6 +17,11 @@
 
 + [笔记](https://github.com/yangsoon/cpptest/blob/master/STL/README.md) [课件](https://github.com/yangsoon/cpptest/blob/master/PPT/STL%E6%A0%87%E5%87%86%E5%BA%93%E4%B8%8E%E6%B3%9B%E5%9E%8B%E7%BC%96%E7%A8%8B.pdf) [代码](https://github.com/yangsoon/cpptest/tree/master/STL)
 
+
+### 深入探索C++对象模型
+
++ [代码]()
+
 ### C++内存管理
 
 TBC...