Here are a few title options, playing with different levels of technical detail and question phrasing: More general, introductory: * How Does the Address Operator Work with Runtime.Object in Kuberne

How Address Operator Executes &Deployment Assignment to runtime.Object

In Kubernetes code, the Generate function in kubectl/run.go returns a list containing runtime.Object and an error. The final line of the function assigns the address of the deployment variable to the first element of the return list. Runtime.Object is an interface defined in k8s.io/apimachinery/pkg/runtime, with methods GetObjectKind and DeepCopyObject.

The address operator (&) creates a pointer to a variable. In Go, the type of a pointer is distinct from its base type. However, the deployment variable is locally declared as an instance of extensionsv1beta1.Deployment, which is a struct that embeds metav1.TypeMeta. This embedding provides the GetObjectKind method for both Deployment and *Deployment (pointer to Deployment).

Additionally, extensionsv1beta1.Deployment implements the DeepCopyObject method directly, with a pointer receiver. This means that *Deployment also has the DeepCopyObject method.

Per the Go specification, an interface can store a value of any type that has a method set that is a superset of the interface. In this case, the method set of Deployment includes all methods defined by Object, making Deployment an implementation of Object.

Therefore, since deployment is of type extensionsv1beta1.Deployment, &deployment will be of type *extensionsv1beta1.Deployment, which implements Object. This allows the assignment of &deployment to a variable of type runtime.Object, which expects a value of type Object or an implementation of Object.

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