英文:
Extract uintptr from reflect.Value
问题
给定代码中的注释，你需要进行以下翻译：
- 我需要一种在这种情况下区分指针和值的方法。
- 如果
i是指向结构体的指针，我需要将其转换为uintptr类型。
另外，根据我目前的发现：(*reflect.Value).InterfaceData() 的第二个成员将是指向结构体的指针（如果它是结构体的话）。如果不是结构体，我不知道它是什么。
英文:
Given
// I know that behind SomeInterface can hide either int or a pointer to struct
// In the real code I only have v, not i
i := something.(SomeInterface)
v := reflect.ValueOf(i)
var p uintptr
if "i is a pointer to struct" {
p = ???
}
- I need some way to distinguish between pointers and values in this situation.
- If
iwas a pointer to struct, I need to cast it touintptr.
Something I discovered so far: the second member of the (*reflect.Value).InterfaceData() will be the pointer to the struct, in case it is a struct. I have no idea what it is in case it is not a struct.
答案1
得分: 1
使用Pointer方法将结构体的地址作为uintptr获取：
var p uintptr
if v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct {
p = v.Pointer()
}
这段代码假设v是调用reflect.ValueOf(i)的结果，如问题中所示。在这种情况下，v表示i的元素，而不是i本身。例如，如果接口i包含一个int，那么v.Kind()是reflect.Int，而不是reflect.Interface。
如果v具有接口值，则通过接口向下获取uintptr：
if v.Kind() == reflect.Interface {
v = v.Elem()
}
var p uintptr
if v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct {
p = v.Pointer()
}
英文:
Use the Pointer method to get the address of a struct as a uintpr:
var p uintptr
if v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct {
p = v.Pointer()
}
This code assumes that v is the result of calling reflect.ValueOf(i) as shown in the question. In this scenario, v represents i's element, not i. For example, if interface i contains an int, then v.Kind() is reflect.Int, not reflect.Interface.
If v has an interface value, then drill down through the interface to get the uintptr:
if v.Kind() == reflect.Interface {
v = v.Elem()
}
var p uintptr
if v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct {
p = v.Pointer()
}
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