slice_3.go

slice_3.go

package main

import (
	"fmt"
	"reflect"
	"unsafe"
)

func main() {
	a := []int{1, 2, 3, 4, 5}
	b := a[2:]
	fmt.Printf("a: %v, sliceHeader: %v\n", a, getSliceHeader(&a))
	fmt.Printf("b: %v, sliceHeader: %v\n", b, getSliceHeader(&b))

	b = append(b, 20)
	fmt.Printf("a: %v, sliceHeader: %v\n", a, getSliceHeader(&a))
	fmt.Printf("b: %v, sliceHeader: %v\n", b, getSliceHeader(&b))
}


// https://stackoverflow.com/a/54196005/463785
func getSliceHeader(slice *[]int) string {
	sh := (*reflect.SliceHeader)(unsafe.Pointer(slice))
	return fmt.Sprintf("%+v", sh)
}