id summary reporter owner description type status milestone component version severity resolution keywords cc 12793 Boost.ICL document exclusive_less_than gast128@… Joachim Faulhaber Intervals in the ICL containers (set or map) are sorted based on exclusive_less_than. The documentation barely mentions it. AFAIAC this mechanism should be documented extensively (e.g. with nice pictures what happens when overlap) since it drives the ICL library for a large extend. Also lower_bound and upper_bound algorithms are driven by this compare function. Note that ICL does offer a compare functor in its interface but this one is not used in the underlying used set or map. Support Requests new To Be Determined ICL Boost 1.61.0 Cosmetic