Hi Speter,
Can you elaborate more on this point please?
> there is no memory or runtime overhead due to encapsulating the string
within a struct.
On Thu, 7 Nov 2019 at 3:15 PM, speter <speter....@gmail.com> wrote:
> Hi bsr,
>
> I'd suggest to use a struct type with a single string field. It will
> prevent conversion from untyped string constant "by mistake".
> Moreover, if you make the string field unexported, you can limit new
> instance creation to the declaring package, allowing to enforce predefined
> values.
> Unlike with some other languages, there is no memory or runtime overhead
> due to encapsulating the string within a struct.
>
> HTH,
> Peter
>
> On Thu, Nov 7, 2019 at 7:58 PM bsr <bsr...@gmail.com> wrote:
>
>> Hello,
>>
>> I am a long time user of go, but I always had the impression that below
>> code would not work as string and Status are different type.
>> I thought I need to explicitly convert as ```exec(Status("abc"))``` it to
>> work.
>>
>> I think, this part of the spec may be the reason
>> https://golang.org/ref/spec#Assignability
>>
>> - x is an untyped constant <https://golang.org/ref/spec#Constants>
>> representable <https://golang.org/ref/spec#Representability> by a
>> value of type T.
>>
>> Is there a way I can prevent this behavior.
>> I am using Status like an enum, and only predefined status values should
>> be allowed.
>>
>>
>>
>>
>> https://play.golang.org/p/4zsb7KtPBC6
>>
>> package main
>>
>> import (
>> "fmt"
>> )
>>
>> type Status string
>>
>> func main() {
>> exec("abc")
>> }
>>
>> func exec(s Status) {
>> fmt.Printf("Hello, %s", s)
>> }
>>
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