#include <iostream>

namespace UC
{
  class string
  {
  public:
    //迭代器实现
    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;
      strcpy(_str, str);
    }
    ~string()
    {
    	delete[]_str;
      _str = nullptr;
      _size = _capacity = 0;
    }
    size_t size() const
    {
    	return _size;
    }
    const char* c_str() const
    {
    	return _str;
    }
    char& operator[](size_t pos)
    {
    	return _str[pos];
    }
    const char& operator[](size_t pos) const
    {
    	return _str[pos];
    }
    //追加字符串
    void push_back(char ch)
    {
    	if(_size == _capacity)
      {
        reserve(_capacity == 0 ? 4 : _capacity * 2);	// 自定义扩容函数
      }
      
      _str[_size] = ch;
      
      ++_size;
      _str[_size] = '\0';
    }
    void append(const char* str)
    {
    	size_t len = strlen(str);
      if(len + _size > _capacity)
      {
      	reserve(len + _size);
      }
      
      strcpy(len + _str, str);
      _size += len;
    }
    //扩容
    void reverse(size_t n)
    {
      if(n > _capacity)
      {
    	char* tamp = new char[n + 1];
      strcpy(tamp, _str);
      delete[]_str;
      _str = nullptr;
      _str = tamp;
       _capacity = n;
      }
    }
    string& operator+=(char ch)
    {
      push_back(ch);
    	return *this;
    }
    string& operator+=(const char* str)
    {
      append(str);
    	return *this;
    }
    private:
    	size_t _size;
    	size_t _capacity;
    	char* _str;
  };
}

#include "String.h"

using std::cout;
using std::endl;

void test_01()
{
	UC::string T1("I like music !");
  cout << T1.c_str() << endl;
  
  //遍历
  for(size_t i = 0; i < T1.size(); i++)
  {
  	cout << T1[i] << " ";
  }
  cout << endl;
  
  //迭代器
  UC::string::iterator it = T1.begin();
  while(it != T1.end())
  {
  	cout << *it << " ";
    ++it;
  }
  cout << endl;
}
void test_02()
{
	UC::string T1("I like music !");
  cout << T1.c_str() << endl;
  
  T1.push_back(' ');
  T1.push_back('&');
  T1.append("$$$$$$$$$$$");
  cout << T1.c_str() <<endl;
}
void test_03()
(
	UC::string T1("I like music !");
  cout << T1.c_str() << endl;
  
  T1 += ' ';
  T1 ++ '*';
  T1 += ' '; 
  T1 ++ "$$$$$$$$";
  
  cout << T1.c_str() << endl;
)
int main()
{
	test_0x();
}