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#define is a pre-processor directive. It makes sense to use in C++ because it's code shorthand. Macro use is popular in C++, such as the MFC/ATL TRACE macro.

The drawback to them in C++ is that...

First of all, look in your existing source code to find out where ROTATE(...) is used. You should find that the variables g and tau are either constants, globals or locals that are already defined....