宏的妙用

1587阅读　0评论2012-04-04　datao0907
分类：C/C++


  1. #define P2END(x,align) (-(~(x) & -(align)))
  2. #define P2ROUNDUP(x,align) (-(-(x) & -(align)))

  4. P2END(0x1234,0x100 – 1) ==>0x12ff
  5. P2ROUNDUP(0x1234,0x100-1) ==>0x1300
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