有没有办法添加两个go interface {}引用？

Question

I am trying to create a method that will append data already cached with non-cached data pulled from the db. Ideally a single method performing something similar as below would be ideal. So is there a way to append two interface{} refs that are both slices?

package main

import "fmt"

type foo struct {
    Name string
}

func main() {
    a := []*foo{
        &foo{"bar"},
        &foo{"boom"},
    }

    b := []*foo{
        &foo{"blam"},
        &foo{"pow"},
    }

    fmt.Println(add(a, b))
}

func add(a, b interface{}) interface{} {
    return append([]interface{}{a}, ([]interface{}{b})...)
}

Results https://play.golang.org/p/9cWxPg6daq

[[0x1040a128 0x1040a130] [0x1040a140 0x1040a148]]

Desired Results

[0x1040a128 0x1040a130 0x1040a140 0x1040a148]

Update: Benchmarks

https://play.golang.org/p/9a8aZckQAF

C:\Users\chris\Go\src\bitbucket.org\chrisolsen\test>go test -bench=.
PASS
BenchmarkWithReflection-4         300000              4580 ns/op
BenchmarkNoReflection-4           300000              4194 ns/op
ok      bitbucket.org/chrisolsen/test   2.911s

Answer 1

Only with reflect:

func add(a, b interface{}) interface{} {
    return reflect.AppendSlice(reflect.ValueOf(a), reflect.ValueOf(b)).Interface()
}

Playground: https://play.golang.org/p/FjS73G2_G5.

Notice though that this will panic if a and b are not compatible slices.