C++程序設計方法3：數組下標運算符重載

數組下標運算符重載

函數聲明形式

返回類型operator[](參數)；

如果返回類型是引用，則數組運算符調用可以出現在等式的左邊，接受賦值，即：

Obj[index] = value;

如果返回類型不是引用，則只能出現在等號的右邊

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)//字符串作下標
    {
        for (int i = 0; i < 7; i++)
        {
            if (strcmp(week_name[i], name) == 0)
                return temp[i];
        }
    }
};

//關於數組下標運算符重載的測試
int main()
{
    WeekTemp beijing;
    beijing["mon"] = -3;
    beijing["tu"] = -1;
    cout << "Monday Temperature:" << beijing["mon"] << endl;
    return 0;
}