A common first "gotcha" in simulation scripts, the following macro must be declared to enable
NS3_ASSERT() assertion macros:
This should happen before
core-module.h is included. Note that macros may be defined from the command line in gcc, e.g.:
g++ -Wall -g -DNS3_ASSERT_ENABLE -o foo src/foo.cc -lns3
This is useful to enable/disable
NS3_ASSERT() without having to edit any code.