Get name of struct implementing interface using interface method, reflection

[Glen Newton]

Hello,

I would like to get the name of the struct implementing an interface (using a method in the interface). I could just have the MyInterface.StructName() method in each implementing struct which just did a return "myname" but I would prefer to do this using reflection and without having to replicate the same method in all implementations,  I have tried using an embedded struct here[1], but it prints the name of the embedded struct. Is there a way to do this?

Why: I have multiple implementations and want to be able to record which implementation was used.

Thanks,

Glen

[1]https://play.golang.org/p/CiXIzzLBHOI

[Ian Lance Taylor]

On Fri, May 8, 2020 at 1:34 PM Glen Newton <glen....@gmail.com> wrote:
>
> I would like to get the name of the struct implementing an interface (using a method in the interface). I could just have the MyInterface.StructName() method in each implementing struct which just did a return "myname" but I would prefer to do this using reflection and without having to replicate the same method in all implementations, I have tried using an embedded struct here[1], but it prints the name of the embedded struct. Is there a way to do this?
>
> Why: I have multiple implementations and want to be able to record which implementation was used.

Perhaps you could use reflect.TypeOf(v).String().

Ian

[Glen Newton]

Thanks!

Oh no, when I try that here: https://play.golang.org/p/RV-S4MJWYUi

Did not work: similar results: instead of:

BaseFoo
BaseFoo
BaseFoo
BaseFoo

now I get:
main.BaseFoo
main.BaseFoo
main.BaseFoo
main.BaseFoo

Other suggestions?  :-)

Thanks,
Glen

[Marcin Romaszewicz]

Go isn't polymorphic, whenever your String() function is called, it's on BaseFoo, you have to do it like this:

https://play.golang.org/p/69rw0jRPalz

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