A reference-style source of features specific to C++ is Bjarne Stroustrup's "The C++ Programming Language" (Addison-Wesley).
This document is not intended as a source for Macintosh programming techniques. That is, there is little discussion on the Macintosh Toolbox ROM routines nor on the event-oriented user-interaction model. An invaluable resource on these issues is David Mark and Cartwright Reed's "Macintosh Programming Primer" (Addison- Wesley).
Finally, the issue of using existing class libraries to simplify the design of graphical user interfaces is discussed only in a general sense, with little regard for the Think Class Library provided with Think C. The reader should investigate the discussion in the Think C manuals before attempting to develop professional-quality Macintosh software.