SimpleDispatcher.h,hpp  :  a simple template dispatcher, allowing existence 
                           of multiple instances
SimpleObserver.h,hpp    :  a simple template observer, with no automatic 
                           self-subscription 
IntObserver.h,cc        :  an observer receiving int numbers and printing them
IntPower.h,cc           :  an observer receiving int numbers and printing
                           their n-th power
obsList.cc              :  a chunk of code creating 3 IntObserver objects
func.cc                 :  a function creating 3 IntPower objects
observerTest.cc         :  a test program sending 10 int numbers


to compile:
c++ -Wall -o observerTest observerTest.cc \
  IntObserver.cc obsList.cc \
  IntPower.cc func.cc
