ofstream_proxy.h,cc  :  a proxy to an ofstream, to open the file 
                        only at first writing
testProxy.cc         :  a test program writing prime factors of numbers

TFileProxy.h         :  a proxy to a TFile, to handle multiple access to
                        the same ROOT file in the same run (in util/include)
rootProxy.cc         :  a test program producing histograms of
                        random numbers

to compile:

c++ -Wall -o testProxy testProxy.cc ofstream_proxy.cc
c++ -Wall `root-config --cflags` -o rootProxy rootProxy.cc `root-config --libs`
