OOST_PP_TUPLE_ELEM</a>(2, 1, data), \
         2 \
      ) \
   ) \
   /**/

// decrement 'x' by 2 'n' times
#define STRIDE(x, n) <a href="tuple_elem.html">BOOST_PP_TUPLE_ELEM</a>(2, 1, <a href="while.html">BOOST_PP_WHILE</a>(PRED, OP, (n, x)))

STRIDE(10, 2) // expands to 6
STRIDE(14, 6) // expands to 2
</pre></div>
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