/*******************************************************************Copyright(c) 2017, htfengAll rights reserved.*******************************************************************///==================================================================// 《剑指Offer——名企面试官精讲典型编程题》代码//  作者：何海涛//  C++//==================================================================// 面试题1：赋值运算符函数// 题目：如下为类型CMyString的声明，请为该类型添加赋值运算符函数。#include
    
     #include
     
      using namespace std;// ===================创建类=====================template
      
       class CMyString {public:    CMyString(T* pData = nullptr);    CMyString(const CMyString
       
        & str);    ~CMyString(void);    CMyString
        
         & operator = (const CMyString
         
          & str); void print();private: T* m_pData;};template
          
           CMyString
           
            ::CMyString(T* pData) { if (pData == nullptr) { m_pData = new T[1]; m_pData[0] = '\0'; } else { int length = strlen(pData); m_pData = new T[length + 1]; strcpy_s(m_pData, length + 1, pData); }}template
            
             CMyString
             
              ::CMyString(const CMyString
              
               & str) { int length = strlen(str.m_pData); m_pData = new T[length + 1]; strcpy_s(m_pData, length+1, str.m_pData);}template
               
                CMyString
                
                 ::~CMyString() { delete[] m_pData;}template
                 
                  CMyString
                  
                   & CMyString
                   
                    ::operator=(const CMyString
                    
                     & str) { if (this == &str) return *this; delete[] m_pData; m_pData = nullptr; int length = strlen(str.m_pData); m_pData = new T[length + 1]; strcpy_s(m_pData, length + 1, str.m_pData); return *this;}//==================测试代码===================template
                     
                      void CMyString
                      
                       ::print() { cout << m_pData << endl;}// 把一个CMyString的实例赋值给另一个实例void test1() { cout << "把一个CMyString的实例赋值给另一个实例:" << endl; char text[] = "hello test1"; char *astr = text; CMyString
                       
                         str1(astr); CMyString
                        
                          str2; str2 = str1; cout << "The expected result is: " << text << endl; cout << "The actual result is:"; str2.print(); cout << endl;}//把一个CMyString的实例赋值给自己void test2() { cout << "把一个CMyString的实例赋值给自己:" << endl; char text[] = "hello test2"; char *astr = text; CMyString
                         
                           str1(astr); str1 = str1; cout << "The expected result is: " << text << endl; cout << "The actual result is:"; str1.print(); cout << endl;}// 连续赋值void test3() { cout << "连续赋值:" << endl; char text[] = "hello world!"; char *astr = text; CMyString
                          
                            str1(astr); CMyString
                           
                             str2, str3; str3 = str2 = str1; cout << "The expected result is: " << text << endl; cout << "The actual result is:"; str2.print(); cout << "The expected result is: " << text << endl; cout << "The actual result is:"; str3.print(); cout << endl;}int main() { test1(); test2(); test3(); system("pause"); return 0;}