文章目錄

• • 1 繼承關系類圖
  • 2 代碼實現

1 繼承關系類圖

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2 代碼實現

SmartPointer.h

#ifndef SMARTPOINTER_H #define SMARTPOINTER_H#include "pointer.h"namespace LemonLib { template <typename T> class SmartPointer : public Pointer<T> { public:SmartPointer(T* p = NULL) : Pointer<T>(p){}SmartPointer(const SmartPointer<T>& obj) : Pointer<T>(NULL){this->m_pointer = obj.m_pointer;const_cast<SmartPointer<T>&>(obj).m_pointer = NULL; /* 同一個對象只允許有一個智能指針指向 */}SmartPointer<T>& operator = (const SmartPointer<T>& obj){if (this != &obj) /* 防止自賦值，需要用指針進行判斷 */{T* p = this->m_pointer;this->m_pointer = obj.m_pointer;const_cast<SmartPointer<T>&>(obj).m_pointer = NULL; /* 同一個對象只允許有一個智能指針指向 */delete p; /* 最后才delete，保證異常安全 */}return *this;}~SmartPointer(){delete this->m_pointer;} }; }#endif // SMARTPOINTER_H

main.cpp

#include <iostream> #include "Object.h" #include "Exception.h" #include "List.h" #include "Seqlist.h" #include "Staticlist.h" #include "Dynamiclist.h" #include "Staticarray.h" #include "DynamicArray.h" #include "Linklist.h" #include "Staticlinklist.h" #include "Smartpointer.h"using namespace std; using namespace LemonLib;class Test { public:Test(){cout << "Test()" << endl;}~Test(){cout << "~Test()" << endl;} };int main() {SmartPointer<Test> pointer = new Test();SmartPointer<Test> psn;psn = pointer;return 0; }

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