C Language Study-use of function pointers

Use of function pointers

1. function pointer definition

The first time I use a function pointer, I declare this,typedef void (*PSIMULATEPKS) (Uint8 *prxbuf, uint8 *prxbuflen);

The first parenthesis (), the PSIMULATEPKS is wrapped into a pointer, the second bracket (), meaning the argument list of a function, so Psimulatepks is a function pointer to a pointer to such a class of functions.

The above declaration of a function pointer, you can define a function pointer,PSIMULATEPKS pfun;

2. function pointer Call function

For example, there is a function that is void fun (Uint8 *prxbuf, uint8 *prxbuflen); You can do this,pfun = fun;

This can be done later when the fun is called,pfun (Rxbuf, &rxbuflen) , or (*pfun) (Rxbuf, &rxbuflen);

3. Function pointers as function return values

Psimulate simfunc (uint8 cmd)

{

Switch (CMD)

{

Case 0X01:

return sim_a;

Case 0X02:

return sim_b;

Case 0X03:

return sim_c;

Case 0X04:

return sim_d;

}

}

Among them, Sim_a Sim_b sim_c sim_d are the function names of such functions.

C Language Study-use of function pointers