/**
 * This is the good way to define a struct ... or really any typedef
 * Basically this ensures that the typedef is only done once.
 * 
 * @author gtowell
 * Created: April 6, 2021
 * **/

#ifndef TYPE_A_DEFINED
typedef struct {
    int v1;
} A; 
#define TYPE_A_DEFINED 1
#endif