PackedIndex.h

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#ifndef DETDESCR_PACKEDINDEX_H_
#define DETDESCR_PACKEDINDEX_H_
 
#include <stdint.h>
 
namespace ldmx {
 
template <unsigned int m0, unsigned int m1 = 0, unsigned int m2 = 0>
class PackedIndex {
 public:
  PackedIndex(unsigned int v0, unsigned int v1, unsigned int v2 = 0,
              unsigned int v3 = 0) {
    index_ = v0 + v1 * m0 + v2 * m0 * m1 + v3 * m0 * m1 * m2;
  }
 
  PackedIndex(uint32_t value) : index_{value} {}
 
  unsigned int field0() const { return index_ % m0; }
  unsigned int field1() const { return (index_ / m0) % m1; }
  unsigned int field2() const { return (index_ / (m0 * m1)) % m2; }
  unsigned int field3() const { return (index_ / (m0 * m1 * m2)); }
 
  uint32_t value() const { return index_; }
 
 private:
  uint32_t index_;
 
};  // PackedIndex
}  // namespace ldmx
 
#endif  // DETDESCR_PACKEDINDEX_H_