1 /* Note that struct foo is opaque (never defined) in this file. This 2 is allowed by C since this file does not reference any members of 3 the structure. The debugger needs to be able to associate this 4 opaque structure definition with the full definition in another 5 file. 6 */ 7 8 struct foo *foop; 9 extern struct foo *getfoo (); 10 extern void putfoo (struct foo *foop); 11 12 int main () 13 { 14 foop = getfoo (); 15 putfoo (foop); 16 return 0; 17 } 18