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2019-03-21 14:23
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golangci-lint常量显式类型

I have a question about golangci-lint. The linter returns me for something like:

type outputFormat string

const (
    formatNone outputFormat = ""
    formatText              = "TEXT"
    formatJSON              = "JSON"
)

an error like:

only the first constant in this group has an explicit type (staticcheck)
formatNone outputFormat = ""

But what's the problem about it? In https://go101.org/article/constants-and-variables.html they describe in chapter Autocomplete in constant declarations that incomplete constants will be recognized and filled.

I did not find any reference which tells me to avoid using incomplete constant definitions.

Can somebody explain to me, what's the matter behind that?

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我有一个关于golangci-lint的问题。 短绒棉还给我一些类似的东西:

 类型outputFormat字符串
 
const(
 formatNone outputFormat =“” 
 formatText =“ TEXT” 
 formatJSON =“ JSON” 
)
    
 
 

错误,例如:

仅该组中的第一个常量具有显式类型 (静态检查)
formatNone outputFormat =“”

但这有什么问题? 在 https://go101.org/article/constants-and-variables.html ,它们在常量声明中的自动填充一章中描述了不完整的常量将是

我找不到任何引用来告诉我避免使用不完整的常量定义。

有人可以向我解释一下,这是什么 背后的事?

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1条回答 默认 最新

  • douxing5199 2019-03-21 14:26
    已采纳

    As explained in staticcheck's documentation for that check:

    In a constant declaration such as the following:

    const (
         First byte = 1
         Second     = 2
    )
    

    the constant Second does not have the same type as the constant First. This construct shouldn't be confused with

    const (
          First byte = iota
          Second
    )
    

    where First and Second do indeed have the same type. The type is only passed on when no explicit value is assigned to the constant.

    When declaring enumerations with explicit values it is therefore important not to write

    const (
          EnumFirst EnumType = 1
          EnumSecond         = 2
          EnumThird          = 3
    )
    

    This discrepancy in types can cause various confusing behaviors and bugs.

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