How to bind subscript operator

hi, all

How to bind subscript operator []

For example

class Node
{
public:
    int GetValue();
...
};

class BindClass
{
public:
    int operator [] (int index)
    {
        return m_nodes[index].GetValue();
    }

    std::vector<Node> m_nodes;
};

In lua, i want code this style:

-- bindClass is BindClass instance.
bindClass[2] = 10;

How to bind, I google but found no solution.

Thanks.

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