typedef 用法总结

C

使用typedef的几个场景

使声明更加易懂

typedef int km_per_hour;
typedef int points;
km_per_hour speed;
points score;

简化声明

struct person{
    int age;
    char *name;
};
struct person Liming;
struct person XiaoHao;
typedef struct person Person;
Person Liming;
Person Xiaohao;

简化指针的声明

struct Node{
    int key;
    struct Node *next;
};
typedef struct Node Node;
struct Node{
    int key;
    Node *next;
};

简化函数指针的声明

int math(int arg1, int arg2);
int call(int (*func)(int, int));
typedef int (*func)(int, int);
int call(func);
void (*signal(int sig, void (*func)(int)))(int);
typedef void (*sighandler_t)(int);
sighandler_t signal(int sig, sighandler_t func);