切片VS指向作家

Question

該代碼產生一個無解引用：

tmpfile, _ := ioutil.TempFile("", "testing") 
defer tmpfile.Close() 
tmpwriter := bufio.NewWriter(tmpfile) 
defer tmpwriter.Flush() 
tmpwriter.WriteString("Hello World\n") 
a := make([]*bufio.Writer, 1) 
a = append(a, tmpwriter) 
a[0].WriteString("It's Me") //Error here 

該代碼產生不無解引用，但實際上並沒有寫入任何臨時文件：

tmpfile, _ := ioutil.TempFile("", "testing") 
defer tmpfile.Close() 
tmpwriter := bufio.NewWriter(tmpfile) 
defer tmpwriter.Flush() 
tmpwriter.WriteString("Hello World\n") 
a := make([]bufio.Writer, 1) 
a = append(a, *tmpwriter) //Dereferencing seems to cause the first string not to get written 
a[0].WriteString("It's Me") 

我在這裏錯過了什麼原則？什麼是存儲一部分作家的慣用方式，以及在第一種情況下導致nil的內容是什麼，以及在第二種情況下導致副作用的指針解引用是什麼？

Answer 1

a := make([]*bufio.Writer, 1) 
a = append(a, tmpwriter) 

然後 LEN（一）== 2和[0] ==零，一[1] == tempwriter， 所以

a[0].WriteString("It's Me") 

恐慌與零參考。

---

可能是你需要：

var a []*bufio.Writer 
a = append(a, tmpwriter) 
a[0].WriteString("It's Me") 

或

a := []*bufio.Writer{tmpwriter} 
a[0].WriteString("It's Me")