分配到golang地圖

Question

在下面的代碼片段中，我做錯了什麼？

type Element interface{} 

func buncode(in *os.File) (e Element) { 
    <snip> 
    e = make(map[string]interface{}) 
    for { 
     var k string = buncode(in).(string) 
     v := buncode(in) 
     e[k] = v 
    } 
    <snip> 
} 

編譯給了我這個錯誤：

gopirate.go:38: invalid operation: e[k] (index of type Element) 

雙母羊牛逼EFF？

Answer 1

在buncode函數中聲明e Element，其中type e Element interface{}。變量e是一個標量值，您試圖對其進行索引。

Types

The static type (or just type) of a variable is the type defined by its declaration. Variables of interface type also have a distinct dynamic type, which is the actual type of the value stored in the variable at run-time. The dynamic type may vary during execution but is always assignable to the static type of the interface variable. For non-interface types, the dynamic type is always the static type.

靜態類型的e是Element，標量。動態類型e是map[string]interface{}。

下面是您的代碼的修訂版，可編譯版本。

type Element interface{} 

func buncode(in *os.File) (e Element) { 
    m := make(map[string]interface{}) 
    for { 
     var k string = buncode(in).(string) 
     v := buncode(in) 
     m[k] = v 
    } 
    return m 
} 

你爲什麼要遞歸調用buncode？