英文:
How to work around Go array sizes in functions
问题
我刚开始使用Go语言，有一件让我感到紧张的事情是，如果我定义了一个接受数组的函数，然后将一个具有特定大小的数组传递给一个函数，VS Code会报错。
例如，我有如下代码：
func cmplt(a, b []uint64) uint64 {
var r, m, i uint64
r = 0
m = 0
for i = 2; i >= 0; i-- {
r |= LtUint64(a[i], b[i]) & ^m
m |= MaskUint64(NeUint64(a[i], b[i]))
}
return r & 1
}
func singleSample(in []uint64) uint64 {
var i, index uint64
index = 0
for i = 0; i < 52; i++ {
index = SelectUint64(index, i+1, cmplt(in, table[i]))
}
return index
}
其中table的类型是[52][3]uint64。我收到一个错误消息，内容是：cannot use table (type [3]uint64) as []uint64 in argument to cmplt。
在Go语言中，有没有办法绕过这个问题，而不是在函数参数中具体指定数组的大小？
英文:
I just started using Go, and one thing that makes me nervous is that if I define a function that accepts an array, and then pass an array to a function with a specific size, VS Code complains about it.
For example, I have something like this:
func cmplt(a, b []uint64) uint64 {
var r, m, i uint64
r = 0
m = 0
for i = 2; i >= 0; i-- {
r |= LtUint64(a[i], b[i]) & ^m
m |= MaskUint64(NeUint64(a[i], b[i]))
}
return r & 1
}
And then I call this function inside another function as:
func singleSample(in []uint64) uint64 {
var i, index uint64
index = 0
for i = 0; i < 52; i++ {
index = SelectUint64(index, i+1, cmplt(in, table[i]))
}
return index
}
where table has type [52][3]uint64. I get an error message saying: cannot use table (type [3]uint64) as []uint64 in argument to cmplt.
Is there any way in Go to workaround this, instead of specifically specifying the array size in function parameter?
答案1
得分: 3
你的 cmplt 函数期望接收一个 uint64 切片，而不是一个包含3个元素的数组。通过对 table[i] 进行切片操作可以修复这个错误：
cmplt(in, table[i][:])
英文:
Your cmplt is expecting a uint64 slice, and not a 3 element array. Taking a slice of table[i] will fix the error:
cmplt(in, table[i][:])
答案2
得分: 0
从我看到的情况来看，最好的解决方案是将你的cmplt函数定义更改为接受数组：
func cmplt(a, b [3]uint64) uint64 {
在你的代码中，你无论如何都依赖于底层数组的大小，因此请确保尽可能清楚地指定函数的依赖关系。
英文:
From what I see the best solution is to change your cmplt function definition to accept arrays:
func cmplt(a, b [3]uint64) uint64 {
In your code you any way rely on the size of the underlying array, hence make sure to specify your function dependencies as clear as possible
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