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Comments (4)

chai2010 avatar chai2010 commented on May 4, 2024 1

可能是故意的，data 有点类型 interface 中 type 指针的味道，用来区分是否是真的 nil

from advanced-go-programming-book.

chai2010 avatar chai2010 commented on May 4, 2024

是想表达以下2种写法是等价的:

	var a []int = nil
	var b = []int{}

from advanced-go-programming-book.

chai2010 avatar chai2010 commented on May 4, 2024

两个确实是不一样的：

package main

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

func main() {
	var a = []int{}
	var b []int = nil

	pa := (*reflect.SliceHeader)(unsafe.Pointer(&a))
	pb := (*reflect.SliceHeader)(unsafe.Pointer(&b))

	fmt.Printf("a: %#v\n", *pa)
	fmt.Printf("b: %#v\n", *pb)
}

输出：

a: reflect.SliceHeader{Data:0xc42003ff20, Len:0, Cap:0}
b: reflect.SliceHeader{Data:0x0, Len:0, Cap:0}

nil初始化的slice底层数据指针是nil

from advanced-go-programming-book.

chai2010 avatar chai2010 commented on May 4, 2024

经查看内容，发现已经修改了描述

from advanced-go-programming-book.

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