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

  * [[https://github.com/pfultz2/Cloak/wiki/C-Preprocessor-tricks,-tips,-and-idioms|C Preprocessor tricks, tips, and idioms]]
  * [[http://jhnet.co.uk/articles/cpp_magic]]
  * [[https://medium.com/codex/c-macros-pseudo-generic-methods-and-structs-b4236e6e50b8|C Macros: Pseudo-generic methods and structs]]

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

===== bitfields =====

<code c>
#define BITMASK(bit_len, bit_shift) (((1U << (bit_len))-1) << (bit_shift))
</code<

  * [[https://stackoverflow.com/questions/31253045/c-macro-to-create-bitfield-defines|C Macro to Create Bitfield Defines]]
  * [[https://forum.arduino.cc/t/calculating-bitmask-values/410649/23?page=2|Calculating Bitmask Values]]