How do I access the underlying structure of Reflect.Value?

php editor Xigua will introduce you how to access the underlying structure of Reflect.Value. Reflect.Value is an important type in Go language, used to represent any value at runtime. Although it provides many convenient methods to manipulate values, sometimes we may need lower-level access to obtain more information. To access the underlying structure of Reflect.Value, we can use the Interface method to convert it to an empty interface type, and then convert it to a concrete structure type through type assertion. This way, we can directly access fields and methods in the underlying structure.

Question content

How to access the underlying (opaque) structure of reflect.Value (e.g., time.Time) from a reflection library?

So far, I've been creating a temporary time.Time, getting its ValueOf, and then using Set() to copy it out. Is there a way to directly access the original as the time. time?

Workaround

When you have a reflect.Value that represents a value of type time.Time, you can reflect. Use the Interface() method on Value to get a value in the form interface{}, then perform a type assertion to convert it back to time.Time.

Here's how you typically convert a reflect.Value containing time.Time back to time.Time:

package main

import (
    "fmt"
    "reflect"
    "time"
)

type MyStruct struct {
    Timestamp time.Time
    Name      string
}

func main() {
    // Create a MyStruct value.
    s := MyStruct{
        Timestamp: time.Now(),
        Name:      "Test",
    }

    // Get the reflect.Value of the MyStruct value.
    val := reflect.ValueOf(s)

    // Access the Timestamp field.
    timeField := val.FieldByName("Timestamp")

    // Use Interface() to get an interface{} value, then do a type assertion
    // to get the underlying time.Time.
    underlyingTime, ok := timeField.Interface().(time.Time)
    if !ok {
        fmt.Println("Failed to get the underlying time.Time")
        return
    }

    fmt.Println("Underlying time.Time:", underlyingTime)
}

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