Struct design_pattern_examples_rust::proxy::proxy_proxy::ProxyEntity

pub struct ProxyEntity {
    real_entity: Option<Box<dyn IWorkByProxy>>,
}

The proxy entity that implements the IWorkByProxy and forwards the calls on that trait to a real entity, which is instantiated when the do_work() method on the IWorkByProxy trait is first called.

Fields

real_entity: Option<Box<dyn IWorkByProxy>>

The one and only instance of the real entity associated with this proxy entity. Initialized with None so it can be filled in later with a pointer to the actual real entity instance.

Implementations

impl ProxyEntity

pub fn new() -> Box<dyn IWorkByProxy>

Constructor

Returns

Returns a new instance of the ProxyEntity struct as implemented by the IWorkByProxy trait.

pub fn get_real_entity(&mut self) -> &mut Box<dyn IWorkByProxy>

Helper method to retrieve the one and only instance of the real entity. This hides the details of instantiating the real entity and enforces a “singleton” nature on the instance.

Returns

Returns a reference to the real entity as implemented by the IWorkByProxy trait.

Trait Implementations

impl IWorkByProxy for ProxyEntity

fn do_work(&mut self, some_argument: &str) -> String

Does some work on the given argument and returns a new string.