/**
 * 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
 * **/

#include "a.h"

#ifndef TYPE_B_DEFINED
typedef struct {
    A oneA;
} B;
#define TYPE_B_DEFINED 1
#endif