Go 中，struct 內的 slice 指針

package main

import (
	"fmt"
)

type A struct {
	ID int8
}

type B struct {
	Arr [][]A
}

func main() {
	b1 := B{
		[][]A{
			[]A{{1}},
		},
	}
	b2 := B{
		[][]A{
			[]A{{2}, {3}},
		},
	}

	bMerge := B{
		append(b1.Arr, b2.Arr...),
	}

	fmt.Printf("For %#v, bMerge: %p; b1: %p\n", bMerge.Arr[0], &bMerge.Arr[0], &b1.Arr[0])
	fmt.Printf("For %#11v, bMerge: %p; b1: %p\n", bMerge.Arr[0][0], &bMerge.Arr[0][0], &b1.Arr[0][0])
	fmt.Printf("For %#11v, bMerge: %p; b2: %p\n", bMerge.Arr[1][0], &bMerge.Arr[1][0], &b2.Arr[0][0])
}

輸出結果

For []main.A{main.A{ID:1}}, bMerge: 0xc000060150; b1: 0xc00000c0a0
For main.A{ID:          1}, bMerge: 0xc00002c008; b1: 0xc00002c008
For main.A{ID:          2}, bMerge: 0xc00002c00a; b2: 0xc00002c00a