[OOP]重载元素操作符

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

class Text
{
public:
    Text(const char* str)
    {
        // 申请一块内存, 保存此字符串
        m_size = strlen(str) + 1;
        m_buf = new char[m_size];
        strcpy(m_buf, str);		
    }
    ~Text()
    {
        // 释放此字符串
        delete [] m_buf;
    }

    char& operator[] (int index)
    {
        return m_buf[index];
    }

private:
    int m_size;
    char* m_buf;
};

int main()
{
    Text t1("helloworld");
    char ch = t1[0];
    t1[0] = 'H';
    return 0;
}