网站维护哪些,成都专业网站设计公司,外贸搜素网站,wordpress paypal支付目录 基本思路
代码实现
1.构建框架#xff1a;
2.构建函数重载
3.迭代器#xff1a;
4.遍历string
5.resetve 开空间#xff0c;insert任意位置插入push_back,append,(按顺序依次实现)
6.erase删除#xff0c;clear清除#xff0c;resize缩容
7.流插入#xff0…
目录 基本思路
代码实现
1.构建框架
2.构建函数重载
3.迭代器
4.遍历string
5.resetve 开空间insert任意位置插入push_back,append,(按顺序依次实现)
6.erase删除clear清除resize缩容
7.流插入流提取
全部代码 本文是对模拟string步骤进行梳理 若要详细讲解请跳转至【C】string模拟-CSDN博客
string讲解【C】String类-CSDN博客
基本思路 构建string类框架 构造函数 拷贝构造析构返回字符串的 C 风格表示返回字符串长度返回总容量 构建函数重载 operator,operator[] ! 迭代器 begin() end() 遍历string resetve 开空间insert任意位置插入push_back,append,,交换 erase删除clear清除resize缩容 流插入流提取
代码实现
1.构建框架 class string{private:char *_str;size_t _size;size_t _capacity;public:string(const char *str ): _size(strlen(str)){_capacity _size 0 ? 3 : _size;_str new char[_size 1];strcpy(_str, str);}// 拷贝string(const string s): _size(s._size), _capacity(s._capacity){_str new char[_capacity 1];strcpy(_str, s._str);}~string(){delete[] _str;_str nullptr;_capacity _size 0;}const char *c_str(){return _str;}//?size_t size() const // const?{return _size;}size_t capacity() const{return _capacity;}};
2.构建函数重载 string operator(const string s){if (this ! s){char *tmp new char[s._capacity 1];strcpy(tmp, s._str);delete[] _str;_str tmp;_size s._size;_capacity s._capacity;}return *this;}char operator[](size_t pos){assert(pos _size);return _str[pos];}const char operator[](size_t pos) const{assert(pos _size);return _str[pos];}bool operator(string s) const{return strcmp(_str, s._str) 0;}bool operator(string s) const{return strcmp(_str, s._str) 0;}bool operator(string s) const{return *this s || *this s;}bool operator(string s) const{return !(*this s);}bool operator(string s) const{return !(*this s);}bool operator!(string s) const{return !(*this s);}
3.迭代器 typedef char *iterator;typedef const char *const_iterator;iterator begin(){return _str;}iterator end(){return _str _size;}
4.遍历string void Print(const string s){//方法1for (size_t i 0; i s.size(); i){cout s[i] ;}cout endl;//方法二迭代器遍历const_iterator rit s.begin();while (rit ! s.end()){cout *rit ;rit;}}
5.resetve 开空间insert任意位置插入push_back,append,(按顺序依次实现) void reserve(size_t n){if (n _capacity){char *tmp new char[n 1];strcpy(tmp, _str);delete[] _str;_str tmp;_capacity n;}}string insert(size_t pos, char ch){assert(pos _size);// 判断大小if (_size 1 _capacity){reserve(2 * _capacity);}size_t end _size 1;while (end pos){_str[end] _str[end 1];end--;}_str[pos] ch;_size;return *this;}string insert(size_t pos, const char *str){assert(pos _size);size_t len strlen(str);if (_size len _capacity){reserve(_size len);}size_t end _size len;while (end pos len - 1){_str[end - len] _str[end];--end;}strncpy(_str pos, str, end);_size len;return *this;}void push_back(char ch){insert(_size, ch);}void append(const char *str){insert(_size, str);}string operator(char ch){push_back(ch);return *this;}string operator(const char *str){append(str);return *this;}
交换void swap(string s){std::swap(_str, s._str);std::swap(_capacity, s._capacity);std::swap(_size, s._size);}
6.erase删除clear清除resize缩容 string erase(size_t pos, size_t len npos){assert(pos _size);if (len npos || len _size){_str[pos] \0;_size pos;}else{strcpy(_str pos, _str pos len);_size - len;}return *this;}void resize(size_t n, char ch \0){if (n _size){_size n;_str[_size] \0;}else if (n _size){if (n _capacity){reserve(n);}size_t i _size;while (i n){_str[i] ch;i;}_size n;_size \0;}}void clear(){_str[0] \0;_size 0;}
7.流插入流提取 ostream operator(ostream out, const string s){for (size_t i 0; i s.size(); i){out s[i];}return out;}istream operator(istream in, string s){s.clear();char ch in.get();char buff[128];size_t i 0;while (ch ! ch ! \n){buff[i] ch;if (i 127){buff[127] \0;s buff;i 0;}ch in.get();}if (i ! 0){buff[i] ch;buff[i 1] \0;s buff;}return in;}
全部代码
string.h #include iostream#include assert.husing namespace std;namespace wzf{class string{private:char *_str;size_t _size;size_t _capacity;static size_t npos;public:typedef char *iterator;typedef const char *const_iterator;iterator begin(){return _str;}iterator end(){return _str _size;}const_iterator begin() const{return _str;}const_iterator end() const{return _str _size;}string(const char *str ): _size(strlen(str)){_capacity _size 0 ? 3 : _size;_str new char[_size 1];strcpy(_str, str);}// 拷贝string(const string s): _size(s._size), _capacity(s._capacity){_str new char[_capacity 1];strcpy(_str, s._str);}~string(){delete[] _str;_str nullptr;_capacity _size 0;}string operator(const string s){if (this ! s){char *tmp new char[s._capacity 1];strcpy(tmp, s._str);delete[] _str;_str tmp;_size s._size;_capacity s._capacity;}return *this;}char operator[](size_t pos){assert(pos _size);return _str[pos];}const char operator[](size_t pos) const{assert(pos _size);return _str[pos];}bool operator(string s) const{return strcmp(_str, s._str) 0;}bool operator(string s) const{return strcmp(_str, s._str) 0;}bool operator(string s) const{return *this s || *this s;}bool operator(string s) const{return !(*this s);}bool operator(string s) const{return !(*this s);}bool operator!(string s) const{return !(*this s);}void reserve(size_t n){if (n _capacity){char *tmp new char[n 1];strcpy(tmp, _str);delete[] _str;_str tmp;_capacity n;}}string insert(size_t pos, char ch){assert(pos _size);// 判断大小if (_size 1 _capacity){reserve(2 * _capacity);}size_t end _size 1;while (end pos){_str[end] _str[end 1];end--;}_str[pos] ch;_size;return *this;}string insert(size_t pos, const char *str){assert(pos _size);size_t len strlen(str);if (_size len _capacity){reserve(_size len);}size_t end _size len;while (end pos len - 1){_str[end - len] _str[end];--end;}strncpy(_str pos, str, end);_size len;return *this;}void push_back(char ch){insert(_size, ch);}void append(const char *str){insert(_size, str);}string operator(char ch){push_back(ch);return *this;}string operator(const char *str){append(str);return *this;}string erase(size_t pos, size_t len npos){assert(pos _size);if (len npos || len _size){_str[pos] \0;_size pos;}else{strcpy(_str pos, _str pos len);_size - len;}return *this;}void resize(size_t n, char ch \0){if (n _size){_size n;_str[_size] \0;}else if (n _size){if (n _capacity){reserve(n);}size_t i _size;while (i n){_str[i] ch;i;}_size n;_size \0;}}void clear(){_str[0] \0;_size 0;}const char *c_str(){return _str;}//?size_t size() const // const?{return _size;}size_t capacity() const{return _capacity;}};size_t string::npos -1;ostream operator(ostream out, const string s){for (size_t i 0; i s.size(); i){out s[i];}return out;}istream operator(istream in, string s){s.clear();char ch in.get();char buff[128];size_t i 0;while (ch ! ch ! \n){buff[i] ch;if (i 127){buff[127] \0;s buff;i 0;}ch in.get();}if (i ! 0){buff[i] ch;buff[i 1] \0;s buff;}return in;}void TestString1(){string s1(Hello);cout s1.c_str() endl;string s2 s1;string s3(s1);cout s3.c_str() endl;s1[0];cout s1.c_str() endl;}void TestString2(){string s1(Hello);cout s1.c_str() endl;string s2(NI);cout (s1 s2) endl;cout (s1 s2) endl;cout (s1 s2) endl;cout (s1 ! s2) endl;cout (s1 s2) endl;}void TestString3(){string s1(Hello);cout s1.c_str() endl;s1 !;s1 2345;cout s1.c_str() endl;}void TestString4(){string s1(HelloWord);string s2(HelloWord);s1.erase(3, 1);cout s1.c_str() endl;s1.erase(3, 100);cout s1.c_str() endl;s2.resize(4);cout s2.c_str() endl;s2.resize(10, x);cout s2.c_str() endl;}void TestString5(){string s1(HelloWord);cout s1 endl;cin s1;string::iterator it s1.begin();while (it ! s1.end() - 1){cout *it ;it;}cout endl;}}
string.cpp #include string.hint main(){try // char* tmp new char[s._capacity 1];是否开辟异常{wzf::TestString5();}catch (const std::exception e){std::cerr e.what() \n;}return 0;}
