英文:
Reflect slice underlying type
问题
我有以下代码：
v := &[]interface{}{client, &client.Id}
valType := reflect.TypeOf(v)
val := reflect.ValueOf(v)
if val.Kind() == reflect.Ptr {
elm := val.Elem()
if elm.Kind() == reflect.Slice {
fmt.Println("Type ->>", elm, " - ", valType.Elem())
}
}
输出结果如下：Type ->> <[]interface {} Value> - []interface {}
我该如何获取它的底层类型？我想检查数组类型是否为interface{}类型。
编辑
一种实现方式，我认为不太好看的方式是：
var t []interface{}
fmt.Println("Type ->>", elm, " - ", valType.Elem(), " --- ", reflect.TypeOf(t) == valType.Elem())
有没有其他方法可以实现？
英文:
I have the following code:
v: = &[]interface{}{client, &client.Id}
valType := reflect.TypeOf(v)
val := reflect.ValueOf(v)
if val.Kind() == reflect.Ptr {
elm := val.Elem()
if elm.Kind() == reflect.Slice {
fmt.Println("Type ->>", elm, " - ", valType.Elem())
}
}
The output is the following one: Type ->> <[]interface {} Value> - []interface {}
How can I get the underlying type of it? I would like to check if array type is of interface{} kind.
EDIT
One way to achieve it, an ugly way IMHO is this one:
var t []interface{}
fmt.Println("Type ->>", elm, " - ", valType.Elem(), " --- ", reflect.TypeOf(t) == valType.Elem())
Can it be done in a different way?
答案1
得分: 3
假设我们有 v := make([]Foo, 0)。如何获取 Foo 类型而不是 []Foo？
正如你已经发现的那样，在你使用切片指针的情况下，valType.Elem().Elem() 可以工作。
但对于普通切片，就像在 "golang reflect value kind of slice" 中所述，只需要这样做：
typ := reflect.TypeOf(<var>).Elem()
英文:
> Let us assume the we have v := make([]Foo, 0).
How to get the Foo type and not []Foo?
As you have found out, valType.Elem().Elem() can work, in your case where you are using a slice pointer.
But for a regular slice, as in "golang reflect value kind of slice", this would be enough:
typ := reflect.TypeOf(<var>).Elem()
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