rangesIntersect.h

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#ifndef TrackingTools_DetLayers_rangesIntersect_h
#define TrackingTools_DetLayers_rangesIntersect_h

template <typename Range>
inline bool rangesIntersect( const Range& a, const Range& b) {
  return !( a.first > b.second || b.first > a.second);
}

template <typename Range, typename Less>
inline bool rangesIntersect( const Range& a, const Range& b, 
                 Less const &less) {
  return  !( less(b.second,a.first) || less(a.second,b.first));
}
template <typename Range, typename T>
inline bool rangesIntersect( const Range& a, const Range& b, 
                 bool (*less)(T,T)) {
  return  !( less(b.second,a.first) || less(a.second,b.first));
}
#endif