Search code examples
c++staticoperator-overloadingindexing

C++ static operator overloading

Is it possible to overload C++ class operators in the static context? e.g.

class Class_1{ ... }
int main()
{

    Class_1[val]...

}
Solution

  • If you are looking for metaprogramming using the built-in operator: Such a thing isn't possible - the built-in operators operate on runtime values, not on compile time values.

    You may use boost::mpl for that, and instead of using the built-in operators, use its templates, like at for op[], plus<a, b> for op+ etc. 

    int main() {
    using boost::mpl::vector;
    using boost::mpl::at_c;
    using boost::mpl::plus;
    using boost::mpl::int_;

    typedef vector<int, bool, char, float> Class_1;
    typedef vector< int_<1>, int_<2> > Numeric_1;

    at_c<Class_1, 0>::type six = 6;
    typedef plus<at_c<Numeric_1, 0>::type 
                ,at_c<Numeric_1, 1>::type>::type r;
    int i3[r::value] = { 4, 5, 6 };
    return ((i3[0] + i3[1] + i3[2]) * six) == 90;
}