Use inlines instead of function macros

Don't use function macros; they are problematic. Instead, declare the functions inline to obviate the need for function macros (see "Inline functions" on page 90 for restrictions). Like const, inline functions follow the C++ scope rules and allow argument type-checking. Both member functions and nonmember functions can be declared inline. Consider this classic example:

      #define SQUARE(x) ((x)*(x))
      // and...
      SQUARE(y++);        // y incremented twice
When written as an inline, it is actually more efficient than the macro version. What's more, it's correct.

      inline int Square(int x)
          return x*x;
      Square(y++);        // y incremented once

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