How to build a compile-time key/value store?

Question

I have a problem where I need to map an integer at compile time to another integer. Basically, I need the compile-time equivalent of std::map. If

Answer 1

In C++11:

template 
struct kv
{
    static const int k = kk, v = vv;
};

template 
struct ct_map;

template 
struct ct_map
{
    template
    struct get
    {
        static const int val = dflt;
    };
};

template
struct ct_map, rest...>
{
    template
    struct get
    {
        static const int val =
            (kk == k) ?
            v :
            ct_map::template get::val;
    };
};

typedef ct_map<42, kv<10, 20>, kv<11, 21>, kv<23, 7>> mymap;

#include 
int main()
{
    std::cout << mymap::get<10>::val << std::endl;
    std::cout << mymap::get<11>::val << std::endl;
    std::cout << mymap::get<23>::val << std::endl;
    std::cout << mymap::get<33>::val << std::endl;
}