ANSI C typedef

Difference Between typedef int x[10] and #define x int[10]

What typedef struct foo { ... foo; } foo; Means

void (*signal(int sig, void (*func)(int)) ) (int);
void (*signal(                          ) ) (int);

typedef void (*ptr_to_func) (int);
/* this says that ptr_to_func is a pointer to a function
* that takes an int argument, and returns void
*/

ptr_to_func signal(int, ptr_to_func);
/* this says that signal is a function that takes
* two arguments, an int and a ptr_to_func, and
* returns a ptr_to_func
*/

typedef int *ptr, (*fun)(), arr[5];
/* ptr is the type "pointer to int"
* fun is the type "pointer to a function returning int"
* arr is the type "array of 5 ints"
*/

Difference Between typedef int x[10] and #define x int[10]

#define peach int
unsigned peach i; /* works fine */
typedef int banana;
unsigned banana i; /* Bzzzt! illegal */

#define int_ptr int *
int_ptr chalk, cheese;

typedef char * char_ptr;
char_ptr Bentley, Rolls_Royce;

What typedef struct foo { ... foo; } foo; Means

There are multiple namespaces in C:

* label names
* tags (one namespace for all structs, enums and unions)
* member names (each struct or union has its own namespace)
* everyting else

struct vnode {
long v_flag;
long v_usecount;
struct vnode *v_freef;
struct vnodeops *v_op;
};

struct foo {int foo;} foo;

typedef struct baz {int baz;} baz;struct baz variable_1;baz variable_2;

typedef struct my_tag {int i;} my_type;struct my_tag variable_1;my_type variable_2;

typedef struct fruit {int weight, price_per_lb } fruit; /*statement 1 */struct veg {int weight, price_per_lb } veg; /*statement 2 */

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ANSI C typedef

Difference Between typedef int x[10] and #define x int[10]

What typedef struct foo { ... foo; } foo; Means

ANSI C typedef相关推荐

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