#include <iostream>
 
struct array
{
    int i = 0;
    array() {}
    const int &operator[](size_t) const { std::cout << "const int[]\n"; return i; }
    int &operator[](size_t) { std::cout << "int[]\n"; return i; }
};
 
int main()
{
    array a;
    a[0];
    int v1 = a[0];
    const int v2 = a[0];
    std::cout << "refs\n";
    int& v3 = a[0];
    const int& v4 = a[0];
    std::cout << "const array\n";
    const array b;
    b[0];
    int v5 = b[0];
    const int v6 = b[0];
    std::cout << "refs\n";
    //int& v7 = b[0]; // would produce a compile error
    const int& v8 = b[0];
}
 

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