[FIX] fixed with the interval join operator

Author: mencagli

docs/windflow-doxygen.conf

@@ -38,7 +38,7 @@ PROJECT_NAME           = "WindFlow"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 4.0.0
+PROJECT_NUMBER         = 4.2.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
@@ -820,6 +820,7 @@ INPUT                  = ../wf/doxygen-mainpage.hpp \
                          ../wf/persistent/p_filter.hpp \
                          ../wf/flatmap.hpp \
                          ../wf/persistent/p_flatmap.hpp \
+                         ../wf/interval_join.jpp \
                          ../wf/iterable.hpp \
                          ../wf/keyed_windows.hpp \
                          ../wf/persistent/p_keyed_windows.hpp \