There are many pure C++ applications in the world that implement
undo. You don't have to use the Cocoa undo at all if portability is
important. Implement undo in C++ using the Command pattern or
whatever technique you want. Then integrate Cocoa GUI support via
menu items etc. for invoking the C++ undo.
I realize the Cocoa provides snazzy undo/redo support that is
difficult to mimic cleanly in C++. That's one reason many people like
Objective-C and Cocoa.
The other alternative is to write your "portable" code in portable
Objective-C.
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