运算符[][] 重载 [英] Operator[][] overload

问题描述

是否可以重载 [] 运算符两次?为了允许，像这样:function[3][3](就像在二维数组中).

Is it possible to overload [] operator twice? To allow, something like this: function[3][3](like in a two dimensional array).

如果可能的话，我想看看一些示例代码.

If it is possible, I would like to see some example code.

推荐答案

你可以重载 operator[] 来返回一个你可以再次使用 operator[] 的对象得到结果.

You can overload operator[] to return an object on which you can use operator[] again to get a result.

class ArrayOfArrays {
public:
    ArrayOfArrays() {
        _arrayofarrays = new int*[10];
        for(int i = 0; i < 10; ++i)
            _arrayofarrays[i] = new int[10];
    }

    class Proxy {
    public:
        Proxy(int* _array) : _array(_array) { }

        int operator[](int index) {
            return _array[index];
        }
    private:
        int* _array;
    };

    Proxy operator[](int index) {
        return Proxy(_arrayofarrays[index]);
    }

private:
    int** _arrayofarrays;
};

然后你可以像这样使用它:

Then you can use it like:

ArrayOfArrays aoa;
aoa[3][5];

这只是一个简单的例子，你想添加一堆边界检查和东西，但你明白了.

This is just a simple example, you'd want to add a bunch of bounds checking and stuff, but you get the idea.

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