content_views"
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class="MsoNormal">全面深入介绍C++字符串：class="tags" href="/tags/STRING.html" title=string>string类
class="MsoNormal"> --刘黎明（liuliming2008@126.com）
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class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948016">1 从C到C++ class="tags" href="/tags/STRING.html" title=string>string类color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">1color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948017">2 class="tags" href="/tags/STRING.html" title=string>string类的构造函数color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">1color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948018">3 class="tags" href="/tags/STRING.html" title=string>string类的字符操作color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">2color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948019">4 class="tags" href="/tags/STRING.html" title=string>string的特性描述color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">2color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948020">5 class="tags" href="/tags/STRING.html" title=string>string类的输入输出操作color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">2color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948021">6 class="tags" href="/tags/STRING.html" title=string>string的赋值color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">3color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948022">7 class="tags" href="/tags/STRING.html" title=string>string的连接color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">3color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948023">8 class="tags" href="/tags/STRING.html" title=string>string的比较color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">3color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948024">9 class="tags" href="/tags/STRING.html" title=string>string类的查找函数color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">4color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948025">10 class="tags" href="/tags/STRING.html" title=string>string类的替换函数color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">5color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948026">11 class="tags" href="/tags/STRING.html" title=string>string类的插入函数color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">5color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948027">12 class="tags" href="/tags/STRING.html" title=string>string类的删除函数color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">6color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948028">13 class="tags" href="/tags/STRING.html" title=string>string类的迭代器处理：color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">6color: windowtext; display: none; text-decoration: none;">
class="MsoToc1">class="MsoHyperlink">csdn.net/liuliming3000/archive/2007/10/02/1809385.aspx#_Toc178948029">14 最简单的class="tags" href="/tags/STRING.html" title=string>string类实现color: windowtext; display: none; text-decoration: none;">...
color: windowtext; display: none; text-decoration: none;">7color: windowtext; display: none; text-decoration: none;">
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从C到C++ class="tags" href="/tags/STRING.html" title=string>string类
class="MsoNormal">C语言的字符串函数c;简单而高效。C++ class="tags" href="/tags/STRING.html" title=string>string类c;功能强大而复杂（对于我这样的人来讲c;复杂了点）。简单的比较没有意义c;只是在特定的情况下哪一个更适合的问题。
class="MsoNormal">而在决定哪一个更适合之前c;你可能需要明白：
class="MsoNormal">A STL标准模板库中的class="tags" href="/tags/STRING.html" title=string>string类使用异常来传递错误
class="MsoNormal">B STL标准模板库中的class="tags" href="/tags/STRING.html" title=string>string类c;是一个具有写时才拷贝（Copy-On-Write）技术的类。Copy-On-Write使用了“引用计数“c;在下列情况下会使用Copy-On-Write：1）以别的类构造自己c;2）以别的类赋值
class="MsoNormal">C 不必担心内存是否足够和字符串长度的同时c;你必须放弃严格控制其内存申请释放的想法。
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class="tags" href="/tags/STRING.html" title=string>string类的构造函数
class="MsoNormal">String类的构造函数和析构函数如下：
a) class="tags" href="/tags/STRING.html" title=string>string s; //生成一个空字符串s
b) class="tags" href="/tags/STRING.html" title=string>string s(str) //拷贝构造函数 生成str的复制品
c) class="tags" href="/tags/STRING.html" title=string>string s(str,stridx) //将字符串str内“始于位置stridx”的部分当作字符串的初值
d) class="tags" href="/tags/STRING.html" title=string>string s(str,stridx,strlen) //将字符串str内“始于stridx且长度顶多strlen”的部分作为字符串的初值
e) class="tags" href="/tags/STRING.html" title=string>string s(cstr) //将C字符串作为s的初值
f) class="tags" href="/tags/STRING.html" title=string>string s(chars,chars_len) //将C字符串前chars_len个字符作为字符串s的初值。
g) class="tags" href="/tags/STRING.html" title=string>string s(num,c) //生成一个字符串c;包含num个c字符
h) class="tags" href="/tags/STRING.html" title=string>string s(beg,end) //以区间beg;end(不包含end)内的字符作为字符串s的初值
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class="tags" href="/tags/STRING.html" title=string>string类的字符操作
class="MsoNormal">const char &operator[](int n)const;
class="MsoNormal">const char &at(int n)const;
class="MsoNormal">char &operator[](int n);
class="MsoNormal">char &at(int n);
class="MsoNormal">operator[]和at()均返回当前字符串中第n个字符的位置c;但at函数提供范围检查c;当越界时会抛出out_of_range异常c;下标运算符[]不提供检查访问。
class="MsoNormal">const char *data()const;//返回一个非null终止的c字符数组
class="MsoNormal">const char *c_str()const;//返回一个以null终止的c字符串
class="MsoNormal">int copy(char *s, int n, int pos = 0) const;//把当前串中以pos开始的n个字符拷贝到以s为起始位置的字符数组中c;返回实际拷贝的数目
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class="tags" href="/tags/STRING.html" title=string>string的特性描述
class="MsoNormal">int capacity()const; //返回当前容量（即class="tags" href="/tags/STRING.html" title=string>string中不必增加内存即可存放的元素个数）
class="MsoNormal">int max_size()const; //返回class="tags" href="/tags/STRING.html" title=string>string对象中可存放的最大字符串的长度
class="MsoNormal">int size()const; //返回当前字符串的大小
class="MsoNormal">int length()const; //返回当前字符串的长度
class="MsoNormal">bool empty()const; //当前字符串是否为空
class="MsoNormal">void resize(int len,char c);//把字符串当前大小置为lenc;并用字符c填充不足的部分
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class="tags" href="/tags/STRING.html" title=string>string类的输入输出操作
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string类重载运算符operator>>用于输入c;同样重载运算符operator<<用于输出操作。
class="MsoNormal">函数getline(istream &in,class="tags" href="/tags/STRING.html" title=string>string &s);用于从输入流in中读取字符串到s中c;以换行符'/n'分开。
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class="tags" href="/tags/STRING.html" title=string>string的赋值
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &operator=(const class="tags" href="/tags/STRING.html" title=string>string &s);//把字符串s赋给当前字符串
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &assign(const char *s);//用c类型字符串s赋值
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &assign(const char *s,int n);//用c字符串s开始的n个字符赋值
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &assign(const class="tags" href="/tags/STRING.html" title=string>string &s);//把字符串s赋给当前字符串
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &assign(int n,char c);//用n个字符c赋值给当前字符串
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &assign(const class="tags" href="/tags/STRING.html" title=string>string &s,int start,int n);//把字符串s中从start开始的n个字符赋给当前字符串
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &assign(const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first,const_itertor last);//把first和last迭代器之间的部分赋给字符串
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class="tags" href="/tags/STRING.html" title=string>string的连接
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &operator+=(const class="tags" href="/tags/STRING.html" title=string>string &s);//把字符串s连接到当前字符串的结尾
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &append(const char *s); //把c类型字符串s连接到当前字符串结尾
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &append(const char *s,int n);//把c类型字符串s的前n个字符连接到当前字符串结尾
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &append(const class="tags" href="/tags/STRING.html" title=string>string &s); //同operator+=()
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &append(const class="tags" href="/tags/STRING.html" title=string>string &s,int pos,int n);//把字符串s中从pos开始的n个字符连接到当前字符串的结尾
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &append(int n,char c); //在当前字符串结尾添加n个字符c
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &append(const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first,const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last);//把迭代器first和last之间的部分连接到当前字符串的结尾
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class="tags" href="/tags/STRING.html" title=string>string的比较
class="MsoNormal">bool operator==(const class="tags" href="/tags/STRING.html" title=string>string &s1,const class="tags" href="/tags/STRING.html" title=string>string &s2)const;//比较两个字符串是否相等
class="MsoNormal">运算符">","<",">=","<=","!="均被重载用于字符串的比较；
class="MsoNormal">int compare(const class="tags" href="/tags/STRING.html" title=string>string &s) const;//比较当前字符串和s的大小
class="MsoNormal">int compare(int pos, int n,const class="tags" href="/tags/STRING.html" title=string>string &s)const;//比较当前字符串从pos开始的n个字符组成的字符串与s的大小
class="MsoNormal">int compare(int pos, int n,const class="tags" href="/tags/STRING.html" title=string>string &s,int pos2,int n2)const;//比较当前字符串从pos开始的n个字符组成的字符串与s中pos2开始的n2个字符组成的字符串的大小
class="MsoNormal">int compare(const char *s) const;
class="MsoNormal">int compare(int pos, int n,const char *s) const;
class="MsoNormal">int compare(int pos, int n,const char *s, int pos2) const;
class="MsoNormal">compare函数在>时返回1c;<时返回-1c;==时返回0
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class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string的子串：
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string substr(int pos = 0,int n = npos) const;//返回pos开始的n个字符组成的字符串
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class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string的交换：
class="MsoNormal">void swap(class="tags" href="/tags/STRING.html" title=string>string &s2); //交换当前字符串与s2的值
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class="tags" href="/tags/STRING.html" title=string>string类的查找函数
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class="MsoNormal">int find(char c, int pos = 0) const;//从pos开始查找字符c在当前字符串的位置
class="MsoNormal">int find(const char *s, int pos = 0) const;//从pos开始查找字符串s在当前串中的位置
class="MsoNormal">int find(const char *s, int pos, int n) const;//从pos开始查找字符串s中前n个字符在当前串中的位置
class="MsoNormal">int find(const class="tags" href="/tags/STRING.html" title=string>string &s, int pos = 0) const;//从pos开始查找字符串s在当前串中的位置
class="MsoNormal">//查找成功时返回所在位置c;失败返回class="tags" href="/tags/STRING.html" title=string>string::npos的值
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class="MsoNormal">int rfind(char c, int pos = npos) const;//从pos开始从后向前查找字符c在当前串中的位置
class="MsoNormal">int rfind(const char *s, int pos = npos) const;
class="MsoNormal">int rfind(const char *s, int pos, int n = npos) const;
class="MsoNormal">int rfind(const class="tags" href="/tags/STRING.html" title=string>string &s,int pos = npos) const;
class="MsoNormal">//从pos开始从后向前查找字符串s中前n个字符组成的字符串在当前串中的位置c;成功返回所在位置c;失败时返回class="tags" href="/tags/STRING.html" title=string>string::npos的值
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class="MsoNormal">int find_first_of(char c, int pos = 0) const;//从pos开始查找字符c第一次出现的位置
class="MsoNormal">int find_first_of(const char *s, int pos = 0) const;
class="MsoNormal">int find_first_of(const char *s, int pos, int n) const;
class="MsoNormal">int find_first_of(const class="tags" href="/tags/STRING.html" title=string>string &s,int pos = 0) const;
class="MsoNormal">//从pos开始查找当前串中第一个在s的前n个字符组成的数组里的字符的位置。查找失败返回class="tags" href="/tags/STRING.html" title=string>string::npos
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class="MsoNormal">int find_first_not_of(char c, int pos = 0) const;
class="MsoNormal">int find_first_not_of(const char *s, int pos = 0) const;
class="MsoNormal">int find_first_not_of(const char *s, int pos,int n) const;
class="MsoNormal">int find_first_not_of(const class="tags" href="/tags/STRING.html" title=string>string &s,int pos = 0) const;
class="MsoNormal">//从当前串中查找第一个不在串s中的字符出现的位置c;失败返回class="tags" href="/tags/STRING.html" title=string>string::npos
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class="MsoNormal">int find_last_of(char c, int pos = npos) const;
class="MsoNormal">int find_last_of(const char *s, int pos = npos) const;
class="MsoNormal">int find_last_of(const char *s, int pos, int n = npos) const;
class="MsoNormal">int find_last_of(const class="tags" href="/tags/STRING.html" title=string>string &s,int pos = npos) const;
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class="MsoNormal">int find_last_not_of(char c, int pos = npos) const;
class="MsoNormal">int find_last_not_of(const char *s, int pos = npos) const;
class="MsoNormal">int find_last_not_of(const char *s, int pos, int n) const;
class="MsoNormal">int find_last_not_of(const class="tags" href="/tags/STRING.html" title=string>string &s,int pos = npos) const;
class="MsoNormal">//find_last_of和find_last_not_of与find_first_of和find_first_not_of相似c;只不过是从后向前查找
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class="tags" href="/tags/STRING.html" title=string>string类的替换函数
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class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(int p0, int n0,const char *s);//删除从p0开始的n0个字符c;然后在p0处插入串s
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(int p0, int n0,const char *s, int n);//删除p0开始的n0个字符c;然后在p0处插入字符串s的前n个字符
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(int p0, int n0,const class="tags" href="/tags/STRING.html" title=string>string &s);//删除从p0开始的n0个字符c;然后在p0处插入串s
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(int p0, int n0,const class="tags" href="/tags/STRING.html" title=string>string &s, int pos, int n);//删除p0开始的n0个字符c;然后在p0处插入串s中从pos开始的n个字符
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(int p0, int n0,int n, char c);//删除p0开始的n0个字符c;然后在p0处插入n个字符c
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first0, class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last0,const char *s);//把[first0c;last0）之间的部分替换为字符串s
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first0, class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last0,const char *s, int n);//把[first0c;last0）之间的部分替换为s的前n个字符
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first0, class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last0,const class="tags" href="/tags/STRING.html" title=string>string &s);//把[first0c;last0）之间的部分替换为串s
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first0, class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last0,int n, char c);//把[first0c;last0）之间的部分替换为n个字符c
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &replace(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first0, class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last0,const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first, const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last);//把[first0c;last0）之间的部分替换成[firstc;last）之间的字符串
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class="tags" href="/tags/STRING.html" title=string>string类的插入函数
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class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &class="tags" href="/tags/INSERT.html" title=insert>insert(int p0, const char *s);
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &class="tags" href="/tags/INSERT.html" title=insert>insert(int p0, const char *s, int n);
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &class="tags" href="/tags/INSERT.html" title=insert>insert(int p0,const class="tags" href="/tags/STRING.html" title=string>string &s);
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &class="tags" href="/tags/INSERT.html" title=insert>insert(int p0,const class="tags" href="/tags/STRING.html" title=string>string &s, int pos, int n);
class="MsoNormal">//前4个函数在p0位置插入字符串s中pos开始的前n个字符
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &class="tags" href="/tags/INSERT.html" title=insert>insert(int p0, int n, char c);//此函数在p0处插入n个字符c
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator class="tags" href="/tags/INSERT.html" title=insert>insert(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator it, char c);//在it处插入字符cc;返回插入后迭代器的位置
class="MsoNormal">void class="tags" href="/tags/INSERT.html" title=insert>insert(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator it, const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first, const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last);//在it处插入[firstc;last）之间的字符
class="MsoNormal">void class="tags" href="/tags/INSERT.html" title=insert>insert(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator it, int n, char c);//在it处插入n个字符c
class="MsoNormal">
class="MsoNormal">
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class="tags" href="/tags/STRING.html" title=string>string类的删除函数
class="MsoNormal">
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator erase(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator first, class="tags" href="/tags/ITERATOR.html" title=iterator>iterator last);//删除[firstc;last）之间的所有字符c;返回删除后迭代器的位置
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator erase(class="tags" href="/tags/ITERATOR.html" title=iterator>iterator it);//删除it指向的字符c;返回删除后迭代器的位置
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string &erase(int pos = 0, int n = npos);//删除pos开始的n个字符c;返回修改后的字符串
class="MsoNormal">
class="MsoNormal">
class="MsoNormal">
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class="tags" href="/tags/STRING.html" title=string>string类的迭代器处理：
class="MsoNormal">
class="MsoNormal">class="tags" href="/tags/STRING.html" title=string>string类提供了向前和向后遍历的迭代器class="tags" href="/tags/ITERATOR.html" title=iterator>iteratorc;迭代器提供了访问各个字符的语法c;类似于指针操作c;迭代器不检查范围。
class="MsoNormal">用class="tags" href="/tags/STRING.html" title=string>string::class="tags" href="/tags/ITERATOR.html" title=iterator>iterator或class="tags" href="/tags/STRING.html" title=string>string::const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator声明迭代器变量c;const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator不允许改变迭代的内容。常用迭代器函数有：
class="MsoNormal">const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator begin()const;
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator begin(); //返回class="tags" href="/tags/STRING.html" title=string>string的起始位置
class="MsoNormal">const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator end()const;
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator end(); //返回class="tags" href="/tags/STRING.html" title=string>string的最后一个字符后面的位置
class="MsoNormal">const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator rbegin()const;
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator rbegin(); //返回class="tags" href="/tags/STRING.html" title=string>string的最后一个字符的位置
class="MsoNormal">const_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator rend()const;
class="MsoNormal">class="tags" href="/tags/ITERATOR.html" title=iterator>iterator rend(); //返回class="tags" href="/tags/STRING.html" title=string>string第一个字符位置的前面
class="MsoNormal">rbegin和rend用于从后向前的迭代访问c;通过设置迭代器class="tags" href="/tags/STRING.html" title=string>string::reverse_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator,class="tags" href="/tags/STRING.html" title=string>string::const_reverse_class="tags" href="/tags/ITERATOR.html" title=iterator>iterator实现
class="MsoNormal">
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最简单的class="tags" href="/tags/STRING.html" title=string>string类实现
class="MsoNormal">
class="MsoNormal">#include<iostream>
class="MsoNormal">using namespace std;
class="MsoNormal">
class="MsoNormal">class String{
class="MsoNormal"> friend ostream& operator<< (ostream&,String&);
class="MsoNormal">public:
class="MsoNormal"> String(const char* str=NULL); //赋值构造兼默认构造函数(char)
class="MsoNormal"> String(const String &other); //赋值构造函数(String)
class="MsoNormal"> String& operator=(const String&other); //operator=
class="MsoNormal"> String operator+(const String &other)const; //operator+
class="MsoNormal"> bool operator==(const String&); //operator==
class="MsoNormal"> char& operator[](unsigned int); //operator[]
class="MsoNormal"> size_t size(){return strlen(m_data);};
class="MsoNormal"> ~String(void) {delete[] m_data;}
class="MsoNormal">private:
class="MsoNormal"> char *m_data;
class="MsoNormal">};
class="MsoNormal">inline String::String(const char* str)
class="MsoNormal">{
class="MsoNormal"> if (!str) m_data=0;
class="MsoNormal"> else
class="MsoNormal"> {
class="MsoNormal"> m_data = new char[strlen(str)+1];
class="MsoNormal"> strcpy(m_data,str);
class="MsoNormal"> }
class="MsoNormal">}
class="MsoNormal">inline String::String(const String& other)
class="MsoNormal">{
class="MsoNormal"> if(!other.m_data) m_data=0;
class="MsoNormal"> else
class="MsoNormal"> {
class="MsoNormal"> m_data=new char[strlen(other.m_data)+1];
class="MsoNormal"> strcpy(m_data,other.m_data);
class="MsoNormal"> }
class="MsoNormal">}
class="MsoNormal">inline String& String::operator=(const String& other)
class="MsoNormal">{
class="MsoNormal"> if (this!=&other)
class="MsoNormal"> {
class="MsoNormal"> delete[] m_data;
class="MsoNormal"> if(!other.m_data) m_data=0;
class="MsoNormal"> else
class="MsoNormal"> {
class="MsoNormal"> m_data = new char[strlen(other.m_data)+1];
class="MsoNormal"> strcpy(m_data,other.m_data);
class="MsoNormal"> }
class="MsoNormal"> }
class="MsoNormal"> return *this;
class="MsoNormal">}
class="MsoNormal">inline String String::operator+(const String &other)const
class="MsoNormal">{
class="MsoNormal"> String newString;
class="MsoNormal"> if(!other.m_data)
class="MsoNormal"> newString = *this;
class="MsoNormal"> else if(!m_data)
class="MsoNormal"> newString = other;
class="MsoNormal"> else
class="MsoNormal"> {
class="MsoNormal"> newString.m_data = new char[strlen(m_data)+strlen(other.m_data)+1];
class="MsoNormal"> strcpy(newString.m_data,m_data);
class="MsoNormal"> strcat(newString.m_data,other.m_data);
class="MsoNormal"> }
class="MsoNormal"> return newString;
class="MsoNormal">}
class="MsoNormal">inline bool String::operator==(const String &s)
class="MsoNormal">{
class="MsoNormal"> if ( strlen(s.m_data) != strlen(m_data) )
class="MsoNormal"> return false;
class="MsoNormal"> return strcmp(m_data,s.m_data)?false:true;
class="MsoNormal">}
class="MsoNormal">inline char& String::operator[](unsigned int e)
class="MsoNormal">{
class="MsoNormal"> if (e>=0&&e<=strlen(m_data))
class="MsoNormal"> return m_data[e];
class="MsoNormal">}
class="MsoNormal">ostream& operator<<(ostream& os,String& str)
class="MsoNormal">{
class="MsoNormal"> os << str.m_data;
class="MsoNormal"> return os;
class="MsoNormal">}
class="MsoNormal">void main()
class="MsoNormal">{
class="MsoNormal"> String str1="Hello!";
class="MsoNormal"> String str2="Teacher!";
class="MsoNormal"> String str3 = str1+str2;
class="MsoNormal"> cout<<str3<<"/n"<<str3.size()<<endl;
class="MsoNormal">}
class="MsoNormal">
class="MsoNormal">如果你还有兴趣c;请查看STL中base_class="tags" href="/tags/STRING.html" title=string>string 的源代码。
class="MsoNormal">
class="MsoNormal">--刘黎明（liuliming2008@126.com）
class="MsoNormal">
class="MsoNormal">
class="MsoNormal">参考资料：
class="MsoNormal">标准C＋＋类std::class="tags" href="/tags/STRING.html" title=string>string的内存共享和Copy-On-Write技术 作者：陈皓 文章来源：纯C电子杂志 2005年1月号(总第3期)
class="MsoNormal">
class="MsoNormal">http://www.zxbc.cn/html/cjjxt/1009360386165.html
class="MsoNormal"> http://blog.csdn.net/jixianghu/archive/2006/12/16/1445847.aspx
class="MsoNormal">[C++]String类的实现 http://blog.csdn.net/freshare/archive/2006/01/23/586535.aspx
class="MsoNormal">
class="MsoNormal">【来源】
