C++ overloading array operator

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It is idiomatic to provide couple of overloads of the operator[] function – one for const objects and one for non-const objects. The return type of the const member function can be a const& or just a value depending on the object being returned while the return type of the non-const member function is usually a reference.

struct Heap{
    int H[100];
    int operator [] (int i) const {return H[i];}
    int& operator [] (int i) {return H[i];}
};

This allows you to modify a non-const object using the array operator.

Heap h1;
h1[0] = 10;

while still allowing you to access const objects.

Heap const h2 = h1;
int val = h2[0];

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