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9.2  Portability & the Macintosh

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Restriction to writing completely portable programs prevents the programmer from taking advantage of useful features specific to a single environment.  For example the Macintosh ROM "Toolbox" provides many invaluable routines for writing Macintosh programs.

It is often possible to confine non-portable code to individual program modules to allow reuse of the remaining code in other environments.  One way of isolating non-portable code is to define an abstract class from which machine-specific versions may be derived.

The files listed in the following pages implement the TC abstract Screen class for general-purpose 2-dimensional graphics combined with stdio-style output.  The      Mac_Screen class is derived from this class for use on the Macintosh, but C++ versions* for DOS or UNIX graphics-capable systems may readily be derived as well.  This allows portable applications with simple graphics output.

TC's MacTraps library is required for applications using the Mac_Screen class.  TC's precompiled header MacHeaders automatically declares the Toolbox functions.


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TC/C++ portability

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TC/C++ portability - p183