How Does C Handle Multi-Argument Array Operators?

Multi-Argument Array Operator in C ?

In C , operators can be overloaded to provide custom behavior for built-in operators such as []. However, prior to C 23, overloading [] to accept multiple arguments was not possible.

Limited Support Before C 23

Attempts to define a multi-argument [] operator would result in a compiler error, as seen in the example code:

const T& operator[](const int i, const int j, const int k) const {
    return m_cells[k*m_resSqr+j*m_res+i];
}

T& operator[](const int i, const int j, const int k) {
    return m_cells[k*m_resSqr+j*m_res+i];
}

This code will trigger the error:

error C2804 binary operator '[' has too many parameters

Workaround Before C 23

As a workaround, one could overload the () operator instead:

T& operator()(const int i, const int j, const int k) {
    return m_cells[k*m_resSqr+j*m_res+i];
}

Support in C 23

From C 23, the language includes support for multi-argument [] operators. As a result, the code shown earlier would be valid and would allow multiple subscript arguments to be passed directly to the [] operator.

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