Go基础之–位操作中你所不知道的用法详解编程语言

 1 package main 
 2  
 3 import ( 
 4     "fmt" 
 5 ) 
 6  
 7 type users struct { 
 8     name   string 
 9     flag   uint8 
10     vip    bool 
11     svip   bool 
12     blue   bool 
13     red    bool 
14     yellow bool 
15 } 
16  
17 func setVip(user users) users { 
18     user.vip = true 
19     return user 
20 } 
21  
22 func isVip(user users) { 
23     if user.vip { 
24         fmt.Println("user is vip") 
25     } else { 
26         fmt.Println("user is not vip") 
27     } 
28 } 
29  
30 func binaryTest() { 
31     var user users 
32     user.name = "test01" 
33     user.vip = true 
34     isVip(user) 
35     user.vip = false 
36     isVip(user) 
37 } 
38  
39 func main() { 
40     binaryTest() 
41  
42 }

 1 package main 
 2  
 3 import ( 
 4     "fmt" 
 5 ) 
 6  
 7 type users struct { 
 8     name string 
 9     flag uint8 
10 } 
11  
12 // 这里通过位移的方式默认00000 从左边一次为vip,svip,blue,red,yellow 
13 const ( 
14     vip   = 1 
15     svip  = (1 << 1) 
16     blue  = (1 << 2) 
17     red   = (1 << 3) 
18     yello = (1 << 4) 
19 ) 
20  
21 // setFlag 用于设置用户开通了哪些特权 
22 func setFlag(user users, isSet bool, typeFlag uint8) users { 
23     if isSet == true { 
24         user.flag = user.flag | typeFlag 
25     } else { 
26         user.flag = user.flag ^ typeFlag 
27     } 
28     return user 
29 } 
30  
31 //isFlag 用于判断用户是否开通某项特权 
32 func isFlag(user users, typeFlag uint8) bool { 
33     result := user.flag & typeFlag 
34     return result == typeFlag 
35 } 
36  
37 func binaryTest() { 
38     var user users 
39     user.name = "coder" 
40     user.flag = 0 
41  
42     //判断用户是否是vip 
43     result := isFlag(user, vip) 
44     fmt.Printf("user is Vip:%t/n", result) 
45  
46     //给用户开通vip,并看用户是否开通vip 
47     user = setFlag(user, true, vip) 
48     result = isFlag(user, vip) 
49     fmt.Printf("user is Vip:%t/n", result) 
50  
51     //取消用户的vip，并查看用户是否还是vip 
52     user = setFlag(user, false, vip) 
53     result = isFlag(user, vip) 
54     fmt.Printf("user is Vip:%t/n", result) 
55 } 
56  
57 func main() { 
58     binaryTest() 
59 }