how_to_silent_bicycle.c

/* Structures */
/* NO! */

typedef struct foo foo_t;

/* YES! */

struct foo;

/* Unions */
/* NO! */

typedef union foo foo_t;

/* YES! */

union foo;

/* Enumerations */
/* NO! */

typedef enum { A, B, C } letter_t;

/* YES! */

enum letter { A, B, C };

/* typedefs */
/* YESs */

typedef unsigned int age_t;
typedef int offset_t;
typedef int count_t;

/* Yes, but only beacuse C's syntax is junk */

typedef void func_ptr (void);

/* NO is anything other than a scalar. */

/* pointers should never EVER be typedeffed for any reason at all ever */
/* yes, even function pointer typedefs. */