C++ double subscript operator overload

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Operator[][] overload

I've looked on the internet but can't find a definitive answer to this question so here I am.

I know that: operator[][]() is not a valid operator overloading, but is their a way to overload the [][] operator (used on vector<vector<typename>> for example).

I need this because I'm doing a sort of wrapper class which contains a vector of vector, and I would have liked

score 8 · Accepted Answer · answered Jun 19 '12 at 19:58

Yes, but it depends on the return type of operator []. You can return a type that itself supports operator [].

Let's say:

struct Matrix
{
   vector<vector<int> > x;
   vector<int>& operator[] (int i)
   {
      return x[i];
   }
};

Because x[i] return a vector, you can use [] again because vector has an operator[].

C++ double subscript operator overload

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