Linux Core Designing

山师第一深情2025-04-27 8:32

week 1

tips:

if you want to learn about the Linux,and find this article,please ensure that you realized this article is the summary from the my study.you can look this as a note,and get some confined knowledge,but if you want to study deeply,you should search for some public courses of some famous teachers.

What you don't realized about c：Point

Understanding Declarations

the following code seems uneasy to understand

c 复制代码

(*(void(*)())0)();

we can rewrite it like this:

c 复制代码

// define a function ptr
typedef void (*funcptr)();
// transform 0 to a function ptr we difined before forcely
// and call this function  
(* (funcptr) 0)();

Interview question of technology company

c 复制代码

void **(*d) (int &,char ** (*)(char *,char **));

the explain of front declare:

d is a pointer to a function that takes two parameters:

*1 a reference to an int and

*2 a function pointer that takes two parameters

** 2.1 a pointer to char

** 2.2 a pointer to pointer to char

Easy C Pointer

please look at this code:

c 复制代码

void main(){
	int a = 15;
	int b = 2;
	int c = 39;
}

if you coded &b maybe you want a reference,and you can called it address of too;

if you coded *&b,the affection just equal b, many body thought that * is a pointer,it's just approximate right,the absolute answer is value of;