macros - C pre-processor defining for generated function names -


i have situation have quite few generated functions, , point them @ generic functions have created (to allow me reuse base code when generated function names change).

essentially, have list of function names follows:

void callback_signalname1(void); void callback_signalname2(void); ...etc

once these generated, define macro allow them called generically. idea this, haven't had luck implementing it...as c pre-processor takes name of macro instead of macro defined as:

#define signal1 signalname1 #define signal2 signalname2  #define function_name(signal) (void  callback_ ## signal ## (void)) ... ... function_name(signal1) {   ..   return; }

the issue receive 

void callback_signal1(void)

instead of

void callback_signalname1(void)

is there way around this?

you need provide level of "function-like macro" ensure proper expansion:

e.g.

#define signal1 signalname1 #define signal2 signalname2  #define make_fn_name(x) void  callback_ ## x (void) #define function_name(signal) make_fn_name(signal)  function_name(signal1) {     return; }

output:

$ gcc -e prepro.cc  # 1 "prepro.cc" # 1 "<built-in>" # 1 "<command-line>" # 1 "prepro.cc"        void callback_signalname1 (void) {  return; }

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