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golang面试题:拷贝大切片一定比小切片代价大吗?

golang面试题:拷贝大切片一定比小切片代价大吗?
默认文件1590972322350.png

问题

拷贝大切片一定比小切片代价大吗?

怎么答

并不是,所有切片的大小相同;三个字段(一个 uintptr,两个int)。切片中的第一个字是指向切片底层数组的指针,这是切片的存储空间,第二个字段是切片的长度,第三个字段是容量。将一个 slice 变量分配给另一个变量只会复制三个机器字。所以 拷贝大切片跟小切片的代价应该是一样的

解释

  • SliceHeader切片在go的底层结构。
type SliceHeader struct {    Data uintptr    Len  int    Cap  int}
  • 大切片跟小切片的区别无非就是 LenCap的值比小切片的这两个值大一些,如果发生拷贝,本质上就是拷贝上面的三个字段。

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文章来源:智云一二三科技

文章标题:golang面试题:拷贝大切片一定比小切片代价大吗?

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