【C++】string模拟实现-阿里云开发者社区

构造

初始化列表部分，要开辟新空间初始化。三次调用strlen效率太低，改进如下图：

我们的构造函数直接写一个全缺省的，这样就不用分开写无参和有参的构造了。上面缺省值不能给nullptr，因为初始化列表那里会报错，str为空，无法strlen。缺省值也不能给'\0'，而要给"\0"，因为'\0'的类型是char，不能给char*。其实给"\0"也是多余的，虽然可以这样写，我们可以直接给空字符串""，系统会在后面自动加上"\0"的。

string(const char* str="")
    : _size(strlen(str))
  {
    _capacity = _size;
    _str = new char[_capacity + 1];
    strcpy(_str, str);
  }

析构

~string()
  {
    delete[] _str;
    _str = nullptr;
    _size = _capacity = 0;
  }

遍历

//遍历
size_t size() const
{
  return _size;
}
size_t capacity() const 
{
  return _capacity;
}
char& operator[](size_t pos) 
{
  assert(pos < _size);
  return _str[pos];   //_str[pos]在堆上，可用引用返回，支持修改
}
const char& operator[](size_t pos) const
{
  assert(pos < _size);
  return _str[pos];   
}
void test_string1()
{
  string s1("hello world");
  string s2;
  for (size_t i = 0; i < s1.size(); i++)
  {
  s1[i]++;
  }
  cout << endl;
  for (size_t i = 0; i < s1.size(); i++)
  {
  cout << s1[i] << "";
  }
  cout << endl;
  const string s3("xxxx");
  for (size_t i = 0; i < s3.size(); i++)
  {
  //s3[i]++      错误，可读，但不能写
  cout << s3[i] << "";
  }
  cout << endl;
}

operator[]需要重载两个，因为string对象可能是const修饰的

迭代器

typedef char* iterator;
iterator begin()
{
  return _str;
}
iterator end()
{
  return _str + _size;
}
void test_string2()
{
  string s3("hello world");
  string::iterator it3 = s3.begin();
  while (it3 != s3.end())
  {
  //*it3 -= 3;
  cout << *it3 << " ";
  ++it3;
  }
  cout << endl;
  for (auto ch : s3)
  {
  cout << ch << " ";
  }
  cout << endl;
}

这里迭代器的模拟实现是容易的，不同的容器有不同的迭代器，只是名字相同。

如果string对象有const修饰时，就需要const迭代器，如下方代码：

typedef const char* const_iterator;
const_iterator begin() const
{
  return _str;
}
const_iterator end() const
{
  return _str + _size;
}
const string s2("hello world");
string::const_iterator it2 = s2.begin(); 
while (it2 != s2.end())
{
  cout << *it2 << " ";
  ++it2;
}
cout << endl;

插入

void reserve(size_t n)
  {
  if (n > _capacity)
  {
    char* tmp = new char[n+1];
    strcpy(tmp, _str);
    delete[] _str;
    _str = tmp;
  
    _capacity = n;
  }
  }
  void push_back(char ch)
  {
/*  if (_size == _capacity)
  {
    reserve(_capacity == 0 ? 4 : 2 * _capacity);
  }
  _str[_size] = ch;
  ++_size;
  _str[_size] = '\0';*/
  insert(_size, ch);
  }
  void append(const char* str)
  {
/*  size_t len = strlen(str);
  if (_size + len > _capacity)
  {
    reserve(_size + len);
  }
  strcpy(_str + _size, str);
  _size += len;*/
  insert(_size, str);
  }
  string& operator+=(char ch)
  {
  push_back(ch);
  return *this;
  }
  string& operator+=(const char* str)
  { 
  append(str);
  return *this;
  }
void insert(size_t pos, char ch)
{
  assert(pos <= _size);
  if (_size == _capacity)
  {
  reserve(_capacity == 0 ? 4 : 2 * _capacity);
  }
  //第一种写法
  /*int end = _size;
  while (end >= (int) pos)  //需要强转，pos是size_t类型，end是int，end会被转成size_t类型，即范围小会转向范围大的。
  {        //当pos等于0，即头插时。结束条件为end小于0，如果不强转，当end小于0时，又会被转成无符号的
  _str[end + 1] = _str[end];  //就会死循环
  --end;
  }*/
  //第二种
  size_t end = _size+1;
  while (end > pos)
  {
  _str[end] = _str[end-1];
  --end;
  }
  _str[pos] = ch;
  ++_size;
}
void 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] = _str[end - len];
  end--;
  }
  strncpy(_str + pos, str, len);
  _size += len;
}
void test_string3()
{
  string s3("hello world"); 
  s3.push_back('1'); 
  s3.push_back('2');  
  cout << s3.c_str()<< endl; 
  s3 += 'x';  
  s3 += "yyyy"; 
  cout << s3.c_str() << endl; 
  string s1("hello world");
  s1.insert(11, 'x');
  cout << s1.c_str() << endl;
  s1.insert(0, 'x');
  cout << s1.c_str() << endl;
}
void test_string6()
{
  string s1("hello world");
  cout << s1.c_str() << endl;
  s1.insert(6, "xxxx");
  cout << s1.c_str() << endl;
}

删除、改变容量、赋值

const char* c_str() const
  {
    return _str;
  }
      void resize(size_t n, char ch = '\0')
  {
    if (n < _size)
    {
    _str[n] = '\0';
    _size = n;
    }
    else
    {
    reserve(n);
    for (size_t i = _size; i < n; i++)
    {
      _str[i] = ch;
    }
    _str[n] = '\0';
    _size = n;
    }
  }
  void erase(size_t pos, size_t len = npos)
  {
  assert(pos < _size);
  if (len == npos || len >= _size - pos)  //len +pos>= _size  不能这么写，会有溢出风险
  {
    _str[pos] = '\0';
    _size = pos;
  }
  else
  {
    strcpy(_str + pos, _str + pos + len);
    _size -= len;
  }
  }
  //s2(s1)
  string(const string& s)
  {
    _str = new char[s._capacity + 1];
    strcpy(_str, s._str);
    _size = s._size;
    _capacity = s._capacity;
  }
  //s1=s3
  string& operator=(const string& s)
  {
    char* tmp = new char[s._capacity+1];
    strcpy(tmp, s._str);
    delete[] _str;
    _str = tmp;
    _size = s._size;
    _capacity = s._capacity;
  
    return *this;
  }
void test_string4()
{
  string s1("hello world");
  cout << s1.c_str() << endl;
  s1.erase(6, 3);
  cout << s1.c_str() << endl;
  string s2("hello world");
  cout << s2.c_str() << endl;
  s2.resize(5);
  cout << s2.c_str() << endl;
  s2.resize(20, 'x');
  cout << s2.c_str() << endl;
}
  void test_string5()
  {
  string s1("hello world");
  cout << s1.c_str() << endl;
  string s2(s1);
  cout << s2.c_str() << endl;
 
  string s3("xxxxx");
  s1 = s3;
  cout << s1.c_str() << endl;
  cout << s3.c_str() << endl;
  }

交换

当我们用算法库里面的模板swap时，效率很低，它会进行3次拷贝+1次析构。我们需要自己手写一个成员函数swap提高效率。如下图：

为了避免有人使用效率不高的swap，其实还有一个全局的swap，如下图：

查找

size_t find(char ch, size_t pos = 0) const
  {
    assert(pos < _size);
    for (size_t i = pos; i < _size; i++)
    {
    if (_str[i] == ch)
      return i;
    }
    return npos;
  }
  size_t find(const char* sub, size_t pos = 0) const
  {
    assert(pos < _size);
    const char* p = strstr(_str+pos, sub);
    if (p)
    {
    return p - _str;
    }
    else
    {
    return npos;
    } 
  }
  string substr(size_t pos = 0, size_t len = npos)
  {
    string sub;
    if (len >= _size - pos)
    {
    for (size_t i = pos; i < _size; i++)
    {
      sub += _str[i];
    }
    }
    else
    {
    for (size_t i = pos; i < pos+len; i++)
    {
      sub += _str[i];
    }
    }
    return sub;
  }
void test_string7()
{
  string url1("https://legacy.cplusplus.com/reference/string/string/substr/");
  string url2("https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=%E5%90%8E%E7%BC%80%20%E8%8B%B1%E6%96%87&fenlei=256&rsv_pq=0xc61b98d100494ef5&rsv_t=b494uh2Bd6SIxMQ1XY4CwB9MZOD%2BaMk5sx8aiT0NAgUczCRAy8jK7PvP5rxt&rqlang=en&rsv_enter=1&rsv_dl=tb&rsv_sug3=23&rsv_sug1=17&rsv_sug7=100&rsv_sug2=0&rsv_btype=i&inputT=7123&rsv_sug4=8008");
  string protocol, domain, uri; 
  size_t i1 = url1.find(':');  
  if (i1 != string::npos) 
  {
  protocol = url1.substr(0, i1 - 0);//左闭右开，减去后就是个数 
  cout << protocol.c_str() << endl; 
  }
  size_t i2 = url1.find('/',i1+3); 
  if (i2 != string::npos)  
  {
  domain = url1.substr(i1+3, i2-(i1+3));//左闭右开，减去后就是个数 
  cout << domain.c_str() << endl; 
 
  uri = url1.substr(i2 + 1); 
  cout << uri.c_str() << endl; 
  }
}

运算符重载

void clear()
  {
    _size = 0;
    _str[_size] = '\0';
  }
  bool operator==(const string& s1, const string& s2)
  {
  int ret = strcmp(s1.c_str(), s2.c_str());
  return ret == 0;
  }
  bool operator<(const string& s1, const string& s2)
  {
  int ret = strcmp(s1.c_str(), s2.c_str());
  return ret < 0;
  }
  bool operator<=(const string& s1, const string& s2)
  {
  return s1 < s2 || s1 == s1;
  }
  bool operator>(const string& s1, const string& s2)
  {
  return !(s1 <= s2);
  }
  bool operator>=(const string& s1, const string& s2)
  {
  return !(s1 < s2);
  }
  bool operator!=(const string& s1, const string& s2)
  {
  return !(s1 == s2);
  }
  ostream& operator<<(ostream& out, const string& s)
  {
  for (auto ch : s)
  {
    out << ch;
  }
  return out;
  }
  istream& operator>>(istream& in, string& s) 
  {
  s.clear(); 
  char ch;
  //in >> ch; 错误，C++规定 cin,scanf默认空格和换行是分隔符，
  ch = in.get();//不会取到,get才能取到
  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] = '\0';
    s += buff; 
  }
  return in;
  }
  istream& getline(istream& in, string& s)
  {
  s.clear();
  char ch;
  //in >> ch; 错误，C++规定 cin,scanf默认空格和换行是分隔符，
  ch = in.get();//不会取到,get才能取到
  while (ch != '\n')
  {
    s += ch;
    ch = in.get();
  }
  return in;
  }
  void test_string8()
  {
  string s1("hello world");
  string s2("hello world");
  cout << (s1 == s2) << endl;
  cout << ("hello world" == s2) << endl;//因为重载成全局的函数，
  cout << (s2 == "hello world") << endl;//单参数构造支持隐式类型转换。
  cout << s1 << endl;
  cout << s2 << endl;
  cin >> s1 >> s2;
  cout << s1 << endl;
  cout << s2 << endl;
  getline(cin, s1);
  cout << s1 << endl;
  }

现代写法

拷贝构造

//现代写法

string(const string& s)

{

string tmp(s._str);

swap(tmp);

}

赋值

string& operator=(string tmp)
  {
    //现代写法
    swap(tmp);
    return *this;
  }

完整代码呈现

头文件

#pragma once
#include<assert.h>
namespace bit
{
  class string
  {
  public:
  typedef char* iterator;
  typedef const char* const_iterator;
  const_iterator begin() const
  {
    return _str;
  }
  const_iterator end() const
  {
    return _str + _size;
  }
  iterator begin()
  {
    return _str;
  }
  iterator end()
  {
    return _str + _size;
  }
  //string()
  //  :_str(nullptr)
  //  ,_size(0)
  //  ,_capacity(0)
  //{}
 
  _str(str)   错误，这样的话声明部分就得加上const，加上后又会导致不能修改   
  //string(const char* str)
  //  :_str(new char[strlen(str)+1])  //必须自己开辟新的空间，
  //  ,_size(strlen(str))          //调用三次strlen，效率不高
  //  ,_capacity(strlen(str))
  //{
  //  strcpy(_str, str);
  //}
  const char* c_str() const
  {
    return _str;
  }
  //string(const char* str = "\0")  里面不能写const char* str =nullptr
  string(const char* str="")
    : _size(strlen(str))
  {
    _capacity = _size;
    _str = new char[_capacity + 1];
    strcpy(_str, str);
  }
  //s2(s1)   传统写法
  //string(const string& s)
  //{
  //  _str = new char[s._capacity + 1];
  //  strcpy(_str, s._str);
  //  _size = s._size;
  //  _capacity = s._capacity;
  //}
 
  //现代写法
  string(const string& s)
  {
    string tmp(s._str);
    swap(tmp);
  }
  string& operator=(string tmp)
  { 
    //现代写法
    swap(tmp);
    return *this;
  }
  //s1=s3  传统写法
  //string& operator=(const string& s)
  //{
  //  char* tmp = new char[s._capacity+1];
  //  strcpy(tmp, s._str);
  //  delete[] _str;
  //  _str = tmp;
  //  _size = s._size;
  //  _capacity = s._capacity;
  //  
  //  return *this;
  //}
  ~string()
  {
    delete[] _str;
    _str = nullptr;
    _size = _capacity = 0;
  }
  //遍历
  size_t size() const
  {
    return _size;
  }
  size_t capacity() const 
  {
    return _capacity;
  }
  char& operator[](size_t pos) 
  {
    assert(pos < _size);
    return _str[pos];   //_str[pos]在堆上，可用引用返回，支持修改
  }
  const char& operator[](size_t pos) const
  {
    assert(pos < _size);
    return _str[pos];   
  }
  void resize(size_t n, char ch = '\0')
  {
    if (n < _size)
    {
    _str[n] = '\0';
    _size = n;
    }
    else
    {
    reserve(n);
    for (size_t i = _size; i < n; i++)
    {
      _str[i] = ch;
    }
    _str[n] = '\0';
    _size = n;
    }
  }
  void reserve(size_t n)
  {
    if (n > _capacity)
    {
    char* tmp = new char[n+1];
    strcpy(tmp, _str);
    delete[] _str;
    _str = tmp;
   
    _capacity = n;
    }
  }
  void push_back(char ch)
  {
  /*  if (_size == _capacity)
    {
    reserve(_capacity == 0 ? 4 : 2 * _capacity);
    }
    _str[_size] = ch;
    ++_size;
    _str[_size] = '\0';*/
    insert(_size, ch);
  }
  void append(const char* str)
  {
  /*  size_t len = strlen(str);
    if (_size + len > _capacity)
    {
    reserve(_size + len);
    }
    strcpy(_str + _size, str);
    _size += len;*/
    insert(_size, str);
  }
  string& operator+=(char ch)
  {
    push_back(ch);
    return *this;
  }
  string& operator+=(const char* str)
  { 
    append(str);
    return *this;
  }
  void insert(size_t pos, char ch)
  {
    assert(pos <= _size);
    if (_size == _capacity)
    {
    reserve(_capacity == 0 ? 4 : 2 * _capacity);
    }
    //第一种写法
    /*int end = _size;
    while (end >= (int) pos)  //需要强转，pos是size_t类型，end是int，end会被转成size_t类型，即范围小会转向范围大的。
    {        //当pos等于0，即头插时。结束条件为end小于0，如果不强转，当end小于0时，又会被转成无符号的
    _str[end + 1] = _str[end];  //就会死循环
    --end;
    }*/
    //第二种
    size_t end = _size+1;
    while (end > pos)
    {
    _str[end] = _str[end-1];
    --end;
    }
    _str[pos] = ch;
    ++_size;
  }
  void 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] = _str[end - len];
    end--;
    }
    strncpy(_str + pos, str, len);
    _size += len;
  }
  void erase(size_t pos, size_t len = npos)
  {
    assert(pos < _size);
    if (len == npos || len >= _size - pos)  //len +pos>= _size  不能这么写，会有溢出风险
    {
    _str[pos] = '\0';
    _size = pos;
    }
    else
    {
    strcpy(_str + pos, _str + pos + len);
    _size -= len;
    }
  }
  void swap(string& s)
  {
    std::swap(_str, s._str);
    std::swap(_size, s._size);
    std::swap(_capacity, s._capacity);
  }
  size_t find(char ch, size_t pos = 0) const
  {
    assert(pos < _size);
    for (size_t i = pos; i < _size; i++)
    {
    if (_str[i] == ch)
      return i;
    }
    return npos;
  }
  size_t find(const char* sub, size_t pos = 0) const
  {
    assert(pos < _size);
    const char* p = strstr(_str+pos, sub);
    if (p)
    {
    return p - _str;
    }
    else
    {
    return npos;
    } 
  }
  string substr(size_t pos = 0, size_t len = npos)
  {
    string sub;
    if (len >= _size - pos)
    {
    for (size_t i = pos; i < _size; i++)
    {
      sub += _str[i];
    }
    }
    else
    {
    for (size_t i = pos; i < pos+len; i++)
    {
      sub += _str[i];
    }
    }
    return sub; 
  }
  void clear()
  {
    _size = 0;
    _str[_size] = '\0';
  }
  private:
  char* _str=nullptr;
  size_t _size=0;
  size_t _capacity=0;
  public:
  static const int npos;
  };
  const int string::npos = -1;
  void swap(string& x, string& y)
  {
  x.swap(y);
  } 
  bool operator==(const string& s1, const string& s2)
  {
  int ret = strcmp(s1.c_str(), s2.c_str());
  return ret == 0;
  }
  bool operator<(const string& s1, const string& s2)
  {
  int ret = strcmp(s1.c_str(), s2.c_str());
  return ret < 0;
  }
  bool operator<=(const string& s1, const string& s2)
  {
  return s1 < s2 || s1 == s1;
  }
  bool operator>(const string& s1, const string& s2)
  {
  return !(s1 <= s2);
  }
  bool operator>=(const string& s1, const string& s2)
  {
  return !(s1 < s2);
  }
  bool operator!=(const string& s1, const string& s2)
  {
  return !(s1 == s2);
  }
  ostream& operator<<(ostream& out, const string& s)
  {
  for (auto ch : s)
  {
    out << ch;
  }
  return out;
  }
  istream& operator>>(istream& in, string& s) 
  {
  s.clear(); 
  char ch;
  //in >> ch; 错误，C++规定 cin,scanf默认空格和换行是分隔符，
  ch = in.get();//不会取到,get才能取到
  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] = '\0';
    s += buff; 
  }
  return in;
  }
  istream& getline(istream& in, string& s)
  {
  s.clear();
  char ch;
  //in >> ch; 错误，C++规定 cin,scanf默认空格和换行是分隔符，
  ch = in.get();//不会取到,get才能取到
  while (ch != '\n')
  {
    s += ch;
    ch = in.get();
  }
  return in;
  }
  void test_string1()
  {
  string s1("hello world");
  string s2;
  for (size_t i = 0; i < s1.size(); i++)
  {
    s1[i]++;
  }
  cout << endl;
  for (size_t i = 0; i < s1.size(); i++)
  {
    cout << s1[i] << "";
  }
  cout << endl;
  const string s3("xxxx");
  for (size_t i = 0; i < s3.size(); i++)
  {
    //s3[i]++      错误，可读，但不能写
    cout << s3[i] << "";
  }
  cout << endl;
  }
  void test_string2()
  {
  string s3("hello world");
  string::iterator it3 = s3.begin();
  while (it3 != s3.end())
  {
    //*it3 -= 3;
    cout << *it3 << " ";
    ++it3;
  }
  cout << endl;
  for (auto ch : s3)
  {
    cout << ch << " ";
  }
  cout << endl;
  const string s2("hello world");
  string::const_iterator it2 = s2.begin(); 
  while (it2 != s2.end())
  {
    cout << *it2 << " ";
    ++it2;
  }
  cout << endl;
  }
  void test_string3()
  {
  string s3("hello world"); 
  s3.push_back('1'); 
  s3.push_back('2');  
  cout << s3.c_str()<< endl; 
  s3 += 'x';  
  s3 += "yyyy"; 
  cout << s3.c_str() << endl; 
  string s1("hello world");
  s1.insert(11, 'x');
  cout << s1.c_str() << endl;
  s1.insert(0, 'x');
  cout << s1.c_str() << endl;
  }
  void test_string4()
  {
  string s1("hello world");
  cout << s1.c_str() << endl;
 
  s1.erase(6, 3);
  cout << s1.c_str() << endl;
  string s2("hello world");
  cout << s2.c_str() << endl;
  s2.resize(5);
  cout << s2.c_str() << endl;
  s2.resize(20, 'x');
  cout << s2.c_str() << endl;
  }
  void test_string5()
  {
  string s1("hello world");
  cout << s1.c_str() << endl;
  string s2(s1);
  cout << s2.c_str() << endl;
 
  string s3("xxxxx");
  s1 = s3;
  cout << s1.c_str() << endl;
  cout << s3.c_str() << endl;
  }
  void test_string6()
  {
  string s1("hello world");
  cout << s1.c_str() << endl;
  s1.insert(6, "xxxx");
  cout << s1.c_str() << endl;
  string s2("xxxxxx");
  cout << s1.c_str() << endl;
  cout << s2.c_str() << endl;
  //swap(s1, s2);  有了全局的swap，就会先调用全局的，
  s1.swap(s2);     //而不是算法库里面的模板swap
  cout << s1.c_str() << endl;
  cout << s2.c_str() << endl;
  }
  void test_string7()
  {
  string url1("https://legacy.cplusplus.com/reference/string/string/substr/");
  string url2("https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=%E5%90%8E%E7%BC%80%20%E8%8B%B1%E6%96%87&fenlei=256&rsv_pq=0xc61b98d100494ef5&rsv_t=b494uh2Bd6SIxMQ1XY4CwB9MZOD%2BaMk5sx8aiT0NAgUczCRAy8jK7PvP5rxt&rqlang=en&rsv_enter=1&rsv_dl=tb&rsv_sug3=23&rsv_sug1=17&rsv_sug7=100&rsv_sug2=0&rsv_btype=i&inputT=7123&rsv_sug4=8008");
  string protocol, domain, uri; 
  size_t i1 = url1.find(':');  
  if (i1 != string::npos) 
  {
    protocol = url1.substr(0, i1 - 0);//左闭右开，减去后就是个数 
    cout << protocol.c_str() << endl; 
  }
  size_t i2 = url1.find('/',i1+3); 
  if (i2 != string::npos)  
  {
    domain = url1.substr(i1+3, i2-(i1+3));//左闭右开，减去后就是个数 
    cout << domain.c_str() << endl; 
   
    uri = url1.substr(i2 + 1); 
    cout << uri.c_str() << endl; 
  }
  } 
  void test_string8()
  {
  string s1("hello world");
  string s2("hello world");
  cout << (s1 == s2) << endl;
  cout << ("hello world" == s2) << endl;//因为重载成全局的函数，
  cout << (s2 == "hello world") << endl;//单参数构造支持隐式类型转换。
  cout << s1 << endl;
  cout << s2 << endl;
  cin >> s1 >> s2;
  cout << s1 << endl;
  cout << s2 << endl;
  getline(cin, s1);
  cout << s1 << endl;
  }
  void test_string10()
  {
  string s1("hello world");
  string s2(s1);
  cout << s1 << endl;
  cout << s2 << endl;
  }
}

测试代码

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<string>
using namespace std;
#include"string.h"
int main()
{
  bit::test_string10();
  return 0;
}

【C++】string模拟实现

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