作者： ayaoko
出处： http://www.cnblogs.com/fyc006/>
关于作者：小可才疏学浅还请多多赐教！
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对象模型：
关于vptr和vtbl、关于this、关于Dynamic Binding
动态绑定：指针 虚函数 向上转型。
A* pa=new B;
pa->vfunc1();
多态vfunc1:
扩展虚指针和虚函数表
（转载）C++ 虚函数表解析
关于New,Delete，重载Operator new，Operator delete
C++ primer 第五版 19.1.1 重载new和delete
1 #include <iostream> 2 #include <cstdio> 3 #include <cstdlib> 4 using namespace std; 5 6 /** rief 7 * Ayaoko test program week5_0 8 * param 9 * param 10 * eturn 11 * 12 */ 13 14 namespace week5_0 //namespace week5_0 15 { 16 17 class CFruit 18 { 19 public: 20 CFruit() 21 { 22 cout<<"构造CFruit基类"<<endl; 23 }; 24 virtual ~CFruit() 25 { 26 cout<<"析构~CFruit基类"<<endl; 27 }; 28 29 void print() { } 30 virtual void process() { } 31 protected: 32 33 private: 34 int no; 35 double weight; 36 char key; 37 38 }; 39 40 class CApple: public CFruit 41 { 42 public: 43 CApple() 44 { 45 cout<<"构造CApple派生类"<<endl; 46 } 47 ~CApple() 48 { 49 cout<<"析构~CApple派生类"<<endl; 50 } 51 52 void save() { } 53 virtual void process() { } 54 protected: 55 56 private: 57 int size; 58 char type; 59 }; 60 61 62 } //namespace week5_0 63 64 /** rief 65 * Ayaoko test program week5_1 66 * param 67 * param 68 * eturn 69 * 70 */ 71 72 namespace week5_1 //namespace week5_1 73 { 74 75 class CFruit 76 { 77 public: 78 CFruit() 79 { 80 cout<<"构造CFruit基类"<<endl; 81 }; 82 virtual ~CFruit() 83 { 84 cout<<"析构~CFruit基类"<<endl; 85 }; 86 87 void print() { } 88 virtual void process() { } 89 protected: 90 91 private: 92 int no; 93 double weight; 94 char key; 95 96 }; 97 98 class CApple: public CFruit 99 { 100 public: 101 CApple() 102 { 103 cout<<"构造CApple派生类"<<endl; 104 } 105 ~CApple() 106 { 107 cout<<"析构~CApple派生类"<<endl; 108 } 109 110 inline void* operator new(size_t _size); 111 inline void operator delete(void* _pv); 112 inline void* operator new[](size_t _size); 113 inline void operator delete[](void* _pv); 114 115 116 void save() { } 117 virtual void process() { } 118 protected: 119 120 private: 121 int size; 122 char type; 123 }; 124 125 inline void* CApple::operator new(size_t _size) 126 { 127 cout <<"In overloaded new."<<endl; 128 if(void *mem = malloc(_size)) 129 return mem; 130 else 131 throw bad_alloc(); 132 133 } 134 135 inline void CApple::operator delete(void* _pv) 136 { 137 cout <<"In overloaded delete."<<endl;; 138 if(_pv) 139 free(_pv); 140 } 141 inline void* CApple::operator new[](size_t _size) 142 { 143 cout <<"In overloaded new[]."<<endl; 144 if(void *mem = malloc(_size)) 145 return mem; 146 else 147 throw bad_alloc(); 148 } 149 inline void CApple::operator delete[](void* _pv) 150 { 151 cout <<"In overloaded delete[]."<<endl;; 152 if(_pv) 153 free(_pv); 154 155 } 156 157 } //namespace week5_1 158 159 160 /** rief 161 * Ayaoko test program main 162 * param 163 * param 164 * eturn 165 * 166 */ 167 168 int main() 169 { 170 cout<<"测试1↓↓↓↓↓↓↓↓↓↓↓↓↓↓"<<endl; 171 cout<<"CFruit:------------------"<<endl; 172 week5_0::CFruit* pFruit=new week5_0::CFruit; 173 cout<<"~Fruit:------------------"<<endl; 174 delete pFruit; 175 176 cout<<" 测试2↓↓↓↓↓↓↓↓↓↓↓↓↓↓"<<endl; 177 cout<<"CApple:------------------"<<endl; 178 week5_0::CApple* pApple=new week5_0::CApple; 179 cout<<"~CApple:------------------"<<endl; 180 delete pApple; 181 182 cout<<" 测试3↓↓↓↓↓↓↓↓↓↓↓↓↓↓"<<endl; 183 cout<<"CApple:------------------"<<endl; 184 week5_1::CApple* pApple1=new week5_1::CApple; 185 cout<<"~CApple:------------------"<<endl; 186 delete pApple1; 187 188 cout<<" 测试4↓↓↓↓↓↓↓↓↓↓↓↓↓↓"<<endl; 189 cout<<"CApple:------------------"<<endl; 190 week5_1::CApple* pApple2=new week5_1::CApple[1]; 191 cout<<"~CApple:------------------"<<endl; 192 delete[] pApple2; 193 194 getchar(); 195 return 0; 196 }
作者：ayaoko
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。