The best way to organize your Go interface

Question

It has been a long time since I programmed in C ++, but I know that in C ++ classes are organized into .h and .cpp files. Many other languages ​​also benefit from dividing code into logical groupings in a directory structure to improve organization.

Well, I'm trying to learn how to go now, and I read the article Go for C ++ Programmers when I came across interfaces. The article explains that interfaces in Go essentially replace classes and show how to set them up pretty well.

What I'm trying to understand is how do I organize the interface into files? For example, should the interface be in one file and the implementation in another?

myInterface.go

type myInterface interface {
    get() int
    set(i int)
}

myImplementation.go

type myType struct { i int }
func (p *myType) set(i int) { p.i = i }
func (p *myType) get() int { return p.i }

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