C++ String Switch

    while (sscanf(remainder, "%s", buf) == 1) {
      string flag = buf;
      switch (cleanHash(flag.c_str(), flag.length())) {
        case str_case(flag, "OnCeil") {
          ...
          break;
        }
        case str_case(flag, "OnFaces") {
          ...
          break;
        }
        case str_case(flag, "OnFloor") {
          ...
          break;
        }
        case str_case(flag, "OnSurf") {
          ...
          break;
        }
        case str_case(flag, "OnTorch") {
          ...
          break;
        }
        case str_case(flag, "OnWall") {
          ...
          break;
        }
      }



// The magic
constexpr int filthyHash(const char *x, int y, int z, int res) {
  return z < y
      ? filthyHash(x, y, z + 1, (int)((long)res * 31 + x[z]))
      : res;
}
constexpr int cleanHash(const char* x, int y) {
  return filthyHash(x, y, 0, 0) << 4 | (y & ((1 << 4) - 1));
}
template<size_t N> constexpr int dirtyHash(const char (&x)[N]) {
  return cleanHash(x, N);
}
#define str_case(key, x) dirtyHash(x): if ((key) == (x))