Not an answer, but just some food for thought.
If class is having overloaded index/subscript operator, the expression 0[x] will not work:
class Sub
{
public:
int operator [](size_t nIndex)
{
return 0;
}
};
int main()
{
Sub s;
s[0];
0[s]; // ERROR
}
Since we dont have access to int class, this cannot be done:
class int
{
int operator[](const Sub&);
};