PRED(D,STATE) is true.
In other words, expands to:
OP(D, ... OP(D, OP(D,STATE) ) ... )
The depth of iteration is determined by
#define PRED(D,STATE) BOOST_PP_LESS_D(D,BOOST_PP_TUPLE_ELEM(2,0,STATE),BOOST_PP_TUPLE_ELEM(2,1,STATE)) #define OP(D,STATE) (BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(2,0,STATE)),BOOST_PP_TUPLE_ELEM(2,1,STATE)) BOOST_PP_WHILE(PRED,OP,(0,3))
BOOST_PP_WHILE() currently does not implement automatic recursion. The reason for this is that it would lead to very poor performance. The automatic recursion technique takes O(N) steps just to find out that the Nth recursion should be used. This would dramatically effect the time complexity of macros using automatic recursion.
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