====== macros ======

<code c>
#define MAX(a, b) \
  ({ __typeof__(a) _a = (a); \
      __typeof__(b) _b = (b); \
    _a > _b ? _a : _b; })
</code>


[[https://stackoverflow.com/questions/31253045/c-macro-to-create-bitfield-defines|C Macro to Create Bitfield Defines]]