英文:
For a Go slice, what is the difference between the slice and a full reslice of the slice?
问题
切片和完全重新切片之间有区别吗？
给定一个切片 s:= make([]byte, 4, 4)，
copy(s[:], "data") 和 copy(s, "data") 之间有区别吗？
这两行代码是否存在会输出不同结果的情况？
英文:
Is there a difference between a slice and a full reslice of it?
given a slice s:= make([]byte, 4, 4),
is there a difference between copy(s[:], "data") and copy(s, "data")?
Is there a case where these two lines will output different results?
答案1
得分: 1
在Go语言中，切片具有3个属性：
- 底层数组
- 切片的长度
- 切片的容量
对于上述所有属性，s和s[:]是相同的。
Go语言实际上没有为切片定义==操作，但是从可测量的属性来看，s和s[:]是相等的。
copy函数只关注前两个属性，而这两个属性在s和s[:]之间是相同的。
英文:
Slices in Go have 3 properties:
- The underlying array
- The length of the slice
- The capacity of the slice
s and s[:] will be identical with respect to all the above properties.
Go doesn't actually define an == operation for slices, but s and s[:] are equal in the sense that all measurable properties are the same.
The copy function is only concerned with the first 2 properties, which are identical between s and s[:].
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