How Can I Call a Go Struct Method by Name Using Reflection?

Calling a Struct Method by Name in Go

This question explores the possibility of calling a method on a struct by its name in Go. The asker seeks a solution that takes the form of CallFunc("MyStruct", "MyMethod"). To address this requirement, we'll delve into the use of reflection in Go.

Reflecting on Values and Methods

The key to calling a method by name lies in utilizing the reflect package. The reflect.ValueOf function can produce a reflect.Value that encapsulates the value of a variable. For structs, you can obtain a value that represents the struct itself or a pointer to it.

Once you have a reflect.Value, you can use the MethodByName method to find a method by its name. This returns a reflect.Method object, which represents the identified method.

Putting It All Together

To complete the process of calling a method by name, you can call the Call method on the reflect.Method. This requires an array of reflect.Value objects as arguments, representing the parameters to be passed to the called method.

In the provided code example, the T struct has a Foo method. To call this method using reflection, you would retrieve the reflect.Value of &t (a pointer to the T instance), find the Foo method using MethodByName, and finally invoke it with Call.

package main

import "fmt"
import "reflect"

type T struct {}

func (t *T) Foo() {
    fmt.Println("foo")
}

func main() {
    var t T
    reflect.ValueOf(&t).MethodByName("Foo").Call([]reflect.Value{})
}

Executing this code prints "foo", demonstrating the successful call of the Foo method by name. This approach provides a versatile way to interact with structs and their methods dynamically at runtime.

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