c++11 initializer_list doesn't support random access? [duplicate]

This question already has an answer here:

• Why doesn't `std::initializer_list` provide a subscript operator? 2 answers

I'm trying to iterate an initializer_list to give values to class elements like this:

int main(){
    struct S{
        int i1;
        int i2;
        int i3;
        S(const initializer_list<int>& l){
            i1=l[0];
            i2=l[1];
            i3=l[2];
        }
    }
    auto l={1,2,3};
    S obj=l;
    return 0;
}

Well, it doesn't compile. I just wish to know if initializer_list support to work like an array? Thanks.