Comments (7)
关于下面函数的描述,正确的是?
func SliceExtend() {
- var slice []int
- s1 := append(slice, 1, 2, 3)
+ s := make([]int, 0, 10)
+ s1 := append(s, 1, 2, 3)
s2 := append(s1, 4)
fmt.Println(&s1[0] == &s2[0])
}
单选:
-- A: 函数操作nil切片会panic
+- A: append函数在操作切片s和s1时发生了扩容
- B: 编译错误,不可以对切片元素取址
- C: 函数输出 true
- D: 函数输出 false
感谢@lzw5399 @xs-cw 两位提供的信息,计划如上修订。题目不再考察扩容的细节。
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谢谢提醒,1.16的变化我还没来得及看。
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@xs-cw 请问你是看的1.16源码吗?扫了一遍 1.16 release notes 没看到相关说明。
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@RainbowMango 源码里有体现的,github上地址
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修订将提供给出版社,不出意外会在第4次印刷地修订。欢迎继续指正。
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@RainbowMango 源码里有体现的,github上地址
@xs-cw 又仔细看了你列出的这个改动。
这个改动主要是解决append(s, 0, 0)
和 append(append(s,0), 0)
这两个表达的行为差异。
它解释不了下面的代码行为:
// main.go
package main
import "fmt"
func main() {
var slice []int
s1 := append(slice, 1, 2, 3)
fmt.Println(cap(s1))
}
上面代码在Go1.15中返回4
, 在Go1.16中返回3
。
不管在Go1.15还是在Go1.16中,上面代码中的append
操作只触发一次growslice,并且old.len
== old.cap
== 0。对于上面的代码而言,这个改动不会改变growslice
的行为。
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应该是1.16的class_to_size
发生了变化,新增了24,1.15var class_to_size = [_NumSizeClasses]uint16{0, 8, 16, 32...
,1.16 var class_to_size = _NumSizeClasses]uint16{0, 8, 16, 24, 32,...
, int64 占用 8 byte,总内存 正好3 * 8 = 24 byte。
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