Can the [] Operator Be Overloaded Twice for Two-Dimensional Array Access?

Operator[][] Overload for Two-Dimensional Arrays

The question arises: can the [] operator be overloaded twice to enable notation like function3 for a two-dimensional array?

Answer: Yes, It Is Possible

To achieve this, one can overload the operator[] to return an object that offers another [] operator for accessing the desired element. Here's an example code:

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;
};

This allows usage like:

ArrayOfArrays aoa;
aoa[3][5];

Note that the above is a simplified example; additional bounds checking and other features would typically be implemented.

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