C++程序设计方法3：数组下标运算符重载

数组下标运算符重载

函数声明形式

返回类型operator[](参数)；

如果返回类型是引用，则数组运算符调用可以出现在等式的左边，接受赋值，即：

Obj[index] = value;

如果返回类型不是引用，则只能出现在等号的右边

Var = Obj[index];

#include <iostream>
#include <string>

using namespace std;

char week_name[7][4] = { "mon","tu","wed","thu","fri","sat","sun" };
class WeekTemp
{
    int temp[7];
public:
    int & operator[] (const char *name)//字符串作下标
    {
        for (int i = 0; i < 7; i++)
        {
            if (strcmp(week_name[i], name) == 0)
                return temp[i];
        }
    }
};

//关于数组下标运算符重载的测试
int main()
{
    WeekTemp beijing;
    beijing["mon"] = -3;
    beijing["tu"] = -1;
    cout << "Monday Temperature:" << beijing["mon"] << endl;
    return 0;
}