Calling c++ object in callback function of c library -

i using c library, uses callback functions.

is there way can access calling object of c++ class ?

edit:

i using c-client lib. have function mm_log.

 void mm_log(char* string, long err_flag) 

which getting internally called library. want check on imap stream getting called.

more info can download library ftp://ftp.cac.washington.edu/imap

all (good) c library functions want callback have void* user_data pointer part of function , callback parameter. pass pointer object function , gets passed in callback. example:

typedef void (*callback)(void*);  void dumb_api_call(callback cb, void* user_data){   cb(user_data); }  struct foo{};  void my_callback(void* my_data){   foo* my_foo = static_cast<foo*>(my_data); }  int main(){   foo my_foo;   dumb_api_call(my_callback, &my_foo); }