C++语言string类的实现(完整源代码)

1、MyString类主整源代码MyString. h 文件丄">'“ >kAx7"."7">7" >彳J哼.十.十.哼Jr* *T吟、吟、*r* 斤哼.T*/Copyright (c) 2013 道合 | Sameidea 1 com All rights reserved.K %丄. 丄. 丄.、丄"=".、.7丁IJ"1 .J*7 * T* bj'J*|g、*7i *g "4、，,.、 J、.、 ：、，.、 j、*.*T *Tttifndef MYSTRING d

2、efine MYSTRING_H include <iostream> using namespace std;class MyString public:构造函数MyStringO;MyString(const MyString&);MyString (const char*):MyString(const size_t, const char);析构函数"MyString ();属性size_t length() :/字符串的长度bool empty () ;/字符串是否为空const char* c_str () :/返回C风格字符串的指针读写操作符frie

3、nd ostream& operator<< (ostream&, const MyString&);friend istream& operator>> (istream&, MyString&);/'+'操作符friend MyString operator+(const MyString&, const MyString&);比较操作符friend friend friend friend friend friendbool bool bool bool bool booloperat

4、or=(const MyString&, const MyString&); operator! = (const MyString&, const MyString&); operator<(const MyString&, const MyString&); operator<= (const MyString&, const MyString&); operator> (const MyString&, const MyString&); operator>=(const MyStri

5、ng&, const MyString&);下标操作符char& operator (const size_t);const char& operator (const size_t)const:赋值操作符MyString& operator二(const MyString&): '+J操作符MyString& operator+二(const MyString&);子串操作MyString substr(size_t, size_t);添加操作MyString& append (const MyString&am

6、p;);/插入操作MyString& insert(size_t, const MyString&);替换操作一MyString& assign (const MyString&,size_t, size_t);删除操作MyString& erase(size_t, size_t):private:size_t strLength; char* p_str;； _ ttendifMyString. cpp 文件I" I"V"I" xtx I" I" I" I" mL#刁.T*

7、 "7*鸣."T* 哼."T* 略."A"卜"7/Copyright (c) 2013 道合 | Sameidea 1. com All rights reserved.£“ " 匕* "" "】". .丄"丄* '“ J"丄*J.、' 丄* .丄* J" J.*1* Y" > :* " >吟J#include '"MyString h" ttinclude <ca

8、ssert>MyString:MyString():strLength(0), p_str(NULL)MyString：:MyString(const MyString& str) strLength = str strLength; p_str = new charstrLength+1; strcpy(p_str, str p_str); 一 一MyString：:MyString(const char* str) 辻(str二二NULL)return;strLength = strlen(str); p_str = new charstrLength+1: strcpy(p

9、_str, str);MyString：:MyString (const size_t len,const char ch)strLength = len;p_str = new charstrLength+1;*(P_str+strLength)二'0 ； strset(p_str, ch); 一MyString： :'MyStringOdeletej p_str; "size_t MyString: length ()"return strLength;bool MyString:empty()return strLength0?true: false;

10、const char* MyString：c_str() "return p_str; /输出操作符ostream& operator<< (ostream& out,const MyString& str) 辻(str. p_str! =NULL) out«str p_str;return out:/输入操作符istream& operator>>(istream& in, MyString& str) /char tempLlOO ;/临时字符串数组 if(in>>temp)delete

11、 str p_str;str.strLength 二 strlen(temp):strp_str = new charstr.strLength+1; strcpy(str p_str, temp); return in;下标操作符char& MyString：:operator (const size_t index) "assert (index>=0 && index<=strLength); return p_strindex; 一下标操作符(const情况) const char& MyString：:operator (cons

12、t size_t index)const "assert(index>=0 && index<=strLength); return p_strindex: "/r +'操作符的巫载MyString operator+ (const MyString& lhs,const MyString& rhs) MyString ret;ret. strLength 二 lhs strLength + rhs. strLength;ret. p_str = new charret. strLength+1: strcpy(ret.

13、p_str, lhs p_str);strcat(ret. p_str, rhs p_str);return ret:赋值操作符MyString& MyString:：operator=(const MyString& str)if (this!=&str)if(strLength<str strLength) delete p_str;p_str = new charstrstrLength+1; "strLength = str strLength; strcpy(p_str, str p_str); 一 一return *this:/r v操作符M

14、yString& MyString:operator+= (const MyString& str)if(this = &str)MyString copy(str); return *this+二copy;strLength += str.strLength;char* p_old = p_str; p_str = new charstrLength+1: strcpy(p_str, p_old); delete p_old; strcat(p_str, str p_str); return *this;比较操作符bool operator=(const MyStri

15、ng& lhs, const MyString& rhs) return strcmp (lhs. p_str, rhs. p_str)二二0; " "bool operator! = (const MyString& lhs, const MyString& rhs) return strcmp(lhs. p_str, rhs. p_str)!=0; " "bool operator<(const MyString& lhs, const MyString& rhs)return strcmp(lh

16、s. p_str, rhs. p_str)<0; " "bool operator<=(const MyString& lhs, const MyString& rhs) return strcmp(lhs. p_str, rhs p_str)<=0; 一 "bool operator>(const MyString& lhs, const MyString& rhs)return strcmp(lhs. p_str, rhs. p_str)>0; 一 "bool operator>=(

17、const MyString& lhs, const MyString& rhs) return strcmp(lhs. p_str, rhs. p_str) >=0; " 子串操作返回一个MyString类型的字符串，它包含源字符串中从下标pos开始的n个 字符MyString MyString：:substr(size_t pos, size_t n) "assert(pos+n二strLength);MyString ret;ret.strLength = n;ret. p_str = new charret. strLength+1;for (

18、size_t i=0;i!=n;+i)ret i = (*this) pos+i;ret n=，0'return ret:添加操作将一个字符串的副本添加到源字符串的木尾，同“+二”操作符类似MyString& MyString:append(const MyString& str)*this+=str;return *this;插入操作/在下标为pos的元素之前插入MyString对象str的副本MyString& MyString:insert(size_t pos,const MyString& str) "assert (pos<strLength);char* p_old = p_str;strLength +=str strLength;p_str = new charstrLength+1;for (size_t i=0;i!=pos;+i)*(p_str+i) = *(p_old+i);for(size_t i=pos;i!=str strLength+pos:+i)*(p_str+i) = *(strp_str+i-pos);for(size_t i二str strLength+pos;i!二strLength;+i)*(p_str+i) =