I had got task to do:
Make func that accepts interface and returns *float64. Func should convert any type, that can be converted without reduction.

So i did this one:

func getValuePtr(val interface{}) (value *float64) {
    switch v := val.(type) {
    case int:
        vv := float64(v)
        value = &vv
    case uint32:
        vv := float64(v)
        value = &vv
    case int32:
        vv := float64(v)
        value = &vv
    case uint64:
        vv := float64(v)
        value = &vv
    case int64:
        vv := float64(v)
        value = &vv
    case float32:
        vv := float64(v)
        value = &vv
    case float64:
        vv := float64(v)
        value = &vv
    }
    return
}

It seems too complex for me. Maybe it isnt 🙂 Maybe you know better solution?