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

Something like this would work:

template
struct StaticMap {
  static const int Value = 0;
};

template<>
struct StaticMap<1> {
  static const int Value = 3;
};

int main()
{
  cout << StaticMap<0>::Value << ", " 
       << StaticMap<1>::Value << ", "
       << StaticMap<2>::Value << endl;
}

0 is the default value, and a key of 1 gives a value of 3. Add additional specializations as needed.

Is this the general idea of what you're looking for? It's not the interface you requested, although preprocessor macros (such as Boost.Preprocessor) could streamline and simplify setting it up.