The interval library is currently marked 'unusable' for Borland so any patch will not show up in regular regression testing! There is a strange compile error that the member functions lower/upper cannot be found in class interval. I still don't have a small test case for the bug, but it appears to depend on the order of declaration in the class itself. Moving these two declarations higher up the file solves the problem: cvs diff interval.hpp (in directory \boost\boost\numeric\interval) Index: interval.hpp =================================================================== RCS file: /cvsroot/boost/boost/boost/numeric/interval/interval.hpp,v retrieving revision 1.7 diff -r1.7 interval.hpp 46a47,49
const T& lower() const; const T& upper() const;
68,70d70 < const T& lower() const; < const T& upper() const; < In particular, anywhere above the constructor: template<class T1, class Policies1> interval(interval<T1, Policies1> const &r); seems to do the trick. This assumes the library author wants to start supporting Borland again of course ;¬) -- AlisdairM