C++ operator overloading example overloading [][] brackets.

Source.cpp

#include <iostream>

class DoubleArray
{
public:
	double** arr;

	DoubleArray(double** arr) : arr(arr) {}

	class Proxy
	{
	public:
		double* _val;
		Proxy(double* _val) : _val(_val) { };

		int operator[](int index) {
			return _val[index];
		}
	};

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

	void operator=(double** arr) {
		this->arr = arr;
	}
};

int main() 
{	
	using namespace std;

	double** twoDim = new double*[3] {
		new double[3] { 1, 2, 3 },
		new double[2] { 3, 4 },
		new double[4] { 5, 6, 7 },
	};

	DoubleArray jnz = twoDim;
	cout << jnz[0][2] << endl;
}