How can I use reflection to obtain the address of a non-pointer field within a nested structure in Go?

Get Pointer to Value Using Reflection

Reflection provides a powerful mechanism to examine the structure and behavior of objects in Go. This can be used to traverse and analyze the fields of an interface, regardless of its underlying type. One common task in such scenarios is retrieving the address of a non-pointer field.

To demonstrate this, consider the following code:

<code class="go">type Z struct {
    Id int
}

type V struct {
    Id int
    F Z
}

type T struct {
    Id int
    F V
}</code>

We define a function InspectStruct to iterate through the fields of an interface and display their details, including their values and addresses. The function utilizes reflection to navigate the structure of the passed interface.

However, the original implementation faced a challenge in obtaining the addresses of non-pointer fields at depths greater than the top-level interface. This issue is addressed by modifying the function to accept reflect.Value directly instead of an interface value (interface{}).

<code class="go">func InspectStructV(val reflect.Value) {
    ...
}

func InspectStruct(v interface{}) {
    InspectStructV(reflect.ValueOf(v))
}</code>

This change allows us to work with the actual reflection value, enabling us to obtain accurate addresses for non-pointer fields regardless of their depth within the structure. The updated output of InspectStruct now shows the correct addresses for all fields in the provided structure:

Field Name: Id,  Field Value: 1,     Address: 0x12345678 , Field type: int   , Field kind: int
Field Name: F,   Field Value: {2 {3}},   Address: 0x12345679 , Field type: main.V    , Field kind: struct
Field Name: Id,  Field Value: 2,     Address: 0x1234567a , Field type: int   , Field kind: int
Field Name: F,   Field Value: {3},   Address: 0x1234567b , Field type: main.Z    , Field kind: struct
Field Name: Id,  Field Value: 3,     Address: 0x1234567c , Field type: int   , Field kind: int

By using reflect.Value directly, the InspectStruct function can now successfully obtain the addresses of all fields, even those nested within the initial interface.

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