Is a structure in Go compatible with the Comparable interface?

In Go, the Comparable interface is not a built-in standard, but it is often understood as an interface with a comparison method, for example:

type Comparable interface {
    Compare(other interface{}) int // returns -1, 0, 1
}

A struct in Go is compatible with an interface if it implements all the methods of that interface. That is, if your struct implements the Compare method with the required signature, then it is compatible with Comparable.

Example:

type MyStruct struct {
    Value int
}

func (m MyStruct) Compare(other interface{}) int {
    o, ok := other.(MyStruct)
    if !ok {
        return -2 // or error handling
    }
    if m.Value < o.Value {
        return -1
    } else if m.Value > o.Value {
        return 1
    }
    return 0
}

// MyStruct now implements Comparable

If the Compare method is not implemented, then the struct is not compatible with the Comparable interface.