1// PR c++/44778
2
3enum Healpix_Ordering_Scheme { RING, NEST };
4
5class Healpix_Base
6  {
7  protected:
8    Healpix_Ordering_Scheme scheme_;
9    int nest2ring (int pix) const;
10    int ring2nest (int pix) const;
11
12    typedef int (Healpix_Base::*swapfunc)(int pix) const;
13  };
14
15template<typename T> class Healpix_Map: public Healpix_Base
16  {
17  public:
18    void Import_nograde (const Healpix_Map<T> &orig)
19      {
20        swapfunc swapper = (scheme_ == NEST) ?
21          &Healpix_Map::ring2nest : &Healpix_Map::nest2ring;
22      }
23  };
24
25int main()
26  {
27  Healpix_Map<double> a,b;
28  a.Import_nograde(b);
29  }
30