Many systems are constructed without the use of modeling and 
visualization artifacts, due to constraints imposed by deadlines 
or a shortage of manpower.  Nevertheless, such systems might 
profit from the visualization provided by diagrams to facilitate 
maintenance of the constructed system.  In this paper, we present 
a tool, Reveal, to reverse engineer a class diagram from the C++ 
source code representation of the software.  In Reveal, we remain 
faithful to the UML standard definition of a class diagram wherever 
possible. However, to accommodate the vagaries of the C++ language, 
we offer some extensions to the standard notation to include 
representations for namespaces, stand-alone functions and friend 
functions. We compare our representation to three other tools that 
reverse-engineer class diagrams, for both compliance to the UML 
standard and for their ability to faithfully represent the software 
system under study.