rangesIntersect.h

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#ifndef rangesIntersect_H
#define rangesIntersect_H

template <class Range>
inline bool rangesIntersect( const Range& a, const Range& b) {
  if ( a.first > b.second || b.first > a.second) return false;
  else return true;
}

template <class Range, class Less>
inline bool rangesIntersect( const Range& a, const Range& b, 
                 const Less& less) {
  if ( less(b.second,a.first) || less(a.second,b.first)) return false;
  else return true;
}
#endif