Using and returning output in C macro

Question

I\'m trying to instrument some code to catch and print error messages. Currently I\'m using a macro somethng like this:

#define my_function(x) \\
  switch(functi         


        

Answer 1

GCC has a feature called statement expressions

So if define macro like

#define FOO(A) ({int retval; retval = do_something(A); retval;})

then you will be able to use it like

foo = FOO(bar);