无法在字符串映射内使用字符串的基础类型：“不能在映射索引中使用（类型）作为字符串类型”
This question already has an answer here:
- Converting a custom type to string in Go 4 answers
I have underlying type of string: type Capability string.
I wanted to use it as a string inside map of strings but I am getting an error:
cannot use cap (type Capability) as type string in map index
This is my code:
package main
import (
"fmt"
)
type Capability string
var caps_list = map[string]int {
"HOME" : 1,
}
func main() {
var cap Capability // string
cap = "HOME"
fmt.Print(string(caps_list[cap]))
}
Why it doesn't accept it ? it is a string after all.
You can try my code here:
https://play.golang.org/p/r-h9Hu8_eoM
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此问题已经存在 在这里有答案： p>
-
在Go语言中将自定义类型转换为字符串
4个答案
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我有基本的字符串类型：
type Capability string code >。 p>我想将其用作字符串映射中的一个字符串，但出现错误： p>
不能使用大写字母（ 类型能力）作为地图索引中的类型字符串 p> blockquote>
这是我的代码： p>
包main \ nimport（ “ fmt” ） type功能字符串 var caps_list = map [string] int { “ HOME”：1， } func main（）{ \ n var cap功能//字符串 cap =“ HOME” fmt.Print（string（caps_list [cap]）） } code> pre>为什么 不接受吗？ 毕竟是一个字符串。 p>
您可以在此处尝试我的代码：
https://play.golang.org/p/r-h9Hu8_eoM p> div>
Just need to change to use string on the cap:
fmt.Print(string(caps_list[string(cap)]))
No it is not a string. It is a type, wich base type is a string.
So the exact type is important. You can also not add celcius to fahrenheit degrees, even if both types would have integer base types.