Preprocessor check if multiple defines are not defined

Question

I have a selection of  defines in a header that are user editable and so I subsequently wish to check that the defines exist in case a user deletes them altogether  e g    if defined MANUF  amp  amp  defined SERIAL  amp  amp  defined MODEL        All defined OK so do nothing  else      error  User is stoopid    endif   This works perfectly OK  I am wondering however if there is a better way to check if multiple defines are NOT in place    i e  something like    ifn defined MANUF    defined SERIAL           note the n in  ifn   or maybe   if  defined MANUF     defined SERIAL          to remove the need for the empty  if section

User · Accepted Answer

if  defined MANUF      defined SERIAL      defined MODEL

User · Answer

FWIW   SergeyL s answer is great  but here is a slight variant for testing   Note the change in logical or to logical and   main c has a main wrapper like this    if  defined TEST SPI   amp  amp   defined TEST SERIAL   amp  amp   defined TEST USB  int main int argc  char  argv           the true main   routine      spi c  serial c and usb c have main wrappers for their respective test code like this    ifdef TEST USB int main int argc  char  argv           the  main   routine for testing the usb code      config h Which is included by all the c files has an entry like this      Uncomment below to test the serial    define TEST SERIAL      Uncomment below to test the spi code    define TEST SPI     Uncomment below to test the usb code  define TEST USB

[c] Preprocessor check if multiple defines are not defined

Examples related to c

Examples related to c-preprocessor