c++ - Preprocessor to count number of strings in file -

i wanted have macro (or else works) can go through c/c++ file, , count number of occurrences of specific string (in physical c/c++ file).

#define numinfile(str) [???]  int main() {     printf("blahblah");     printf("you've used printf %d times", numinfile ("printf") - 2); //-2 account call     return 0; } 

edit: question specific using functionality exit calls. generalize use.

if understand correctly, want have unique error codes, can trace line error happened?

i address y question instead of x one:

you can use __line__. __line__ expands integer constant of current line number. #define quit as:

#define quit(code) (quit)(__line__+(code)) void (quit)(code) { // seperate func in case want more     exit(code); } 

keep in mind though exit code of process not best way encode such information. on posix, lower 8 bit of exit code guaranteed available. use 300 base value, assume on windows or other system isn't concern.

for debugging purposes, alternatively consider writing stderr, when error happens (maybe command line flag).

if exit example, , intend use inside application, save __line__ , __file__ in global (or _thread_local) variables on error , store exit reason in error code.

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regarding x question, preprocessor doesn't such stuff. have offload such tasks shell/perl/whatever script build script can call.