英文:
Casting interface can reflecting on array types
问题
下面的代码是对Python脚本的改编。当然，它不能编译，有几个原因。
我很难理解如何修复它以便得到正确的结果。
具体来说：
-
我想表示一个类型（
float64）或者这个类型的数组，所以我天真地使用了[]interface{}，但是传递一个数组是行不通的。我知道我可以使用我的数组来深拷贝一个接口数组，但这是唯一的方法吗？ -
反射检查是有效的（有点），但是我又回到了将接口转换为
[]interface{}，这是行不通的。 -
一个更简单的方法是传递
[]float，但我还想使代码足够通用（糟糕！;-），以接受[][]floats并递归地进行比较。
我完全偏离了轨道吗？
func assertArrayEquals(first []interface{}, second []interface{}) bool {
if len(first) != len(second) {
return false
}
for i := range first {
if reflect.ValueOf(first[i]).Kind() == reflect.Array {
assertArrayEquals([]interface{}(first[i]), []interface{}(second[i]))
} else if second[i] != first[i] {
return false
}
}
return true
}
func main() {
assertArrayEquals([]float64{[]float64{0, 1}, []float64{0, 1}}, []float64{[]float64{0, 1}, []float64{0, 1}})
}
英文:
The code below is an adaption of a Python script. Of course, it doesn't compile and there are a couple of reasons for this.
I am struggling to understand how it's possible to fix it so it gives the right result.
In particular:
-
I want to represent either a type (
float64) or anarrayof this type so I am naively using an[]interfacebut then passing an array won't work. I understand I could deep copy an interface array with my array but is it the only way? -
The reflection check works (kinda) but then I am back to casting an interface to an
[]interfaceand that doesn't work. -
A simpler way would be to pass
[]floatbut I also want to make the code generic (oops!
enough to accept [][]floatsand recursively descend with the comparisons.
Am I completely offtrack?
func assertArrayEquals(first []interface{}, second []interface{}) bool {
if len(first) != len(second) {
return false
}
for i := range first {
if reflect.ValueOf(first[i]).Kind() == reflect.Array {
assertArrayEquals([]interface{}(first[i]), []interface{}(second[i]))
} else if second[i] != first[i] {
return false
}
}
return true
}
func main() {
assertArrayEquals([]float64{[]float64{0, 1}, []float64{0, 1}}, []float64{[]float64{0, 1}, []float64{0, 1}})
}
答案1
得分: 1
这是一种实现 assertArrayEquals 的方法：
func assertArrayEquals(first interface{}, second interface{}) bool {
return reflect.DeepEqual(first, second)
}
英文:
Here's one way to implement assertArrayEquals:
func assertArrayEquals(first interface{}, second interface{}) bool {
return reflect.DeepEqual(first, second)
}
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