引用结构的指针并克隆它

Question

Please ignore that this seems like a bad idea, is bad style, etc.

The main issue here is that process() gets a pointer to a struct of an unknown type passed in as interface{} and I need to clone the underlying struct.

The core issue is that I can't figure out how to deference the pointer, since its passed in as interface{}, so I can clone the underlying struct and return it.

package main

import (
    "fmt"
    "reflect"
)

type Foo struct {
    Value string
}

func main() {
    foo1 := Foo{"bar"}
    foo2 := process(&foo1)
    result := reflect.DeepEqual(foo1, foo2)
    fmt.Println(result) // how do I make this true?
}

// objective: pointer to struct is passed it, clone of underlying struct is returned
func process(i interface{}) interface{} {
    return clone(i)
}

Answer 1

Using some reflection magic, I was able to get this to work. Thanks, JimB, for all your help! The code in this question is obviously contrived. I need this functionality for a testing utility that takes "snapshots" of structs of any type at different stages before various mutations are applied.

...    
func process(i interface{}) (interface{}, error) {
    value := reflect.ValueOf(i)
    if value.Kind() == reflect.Ptr {
        i = value.Elem().Interface()
    }

    return copystructure.Copy(i)
}
...