Rust简单工厂模式

简单工厂模式 

trait Login {
    fn verify(&self, name: String, password: String) -> bool;
}

enum LoginType {
    Domain,
    Password,
}

struct DomainLogin {}

impl Login for DomainLogin {
    fn verify(&self, name: String, password: String) -> bool {
        /**
        * do some work
        * */
        println!("login via domain");
        true
    }
}

struct PasswordLogin {}

impl Login for PasswordLogin {
    fn verify(&self, name: String, password: String) -> bool {
        /**
        * do some work
        * */
        println!("login via password");
        true
    }
}

struct LoginManager;

impl LoginManager {
    fn factory(type_: &LoginType) -> Box<dyn Login> {
        match type_ {
            LoginType::Domain => Box::new(DomainLogin{}),
            LoginType::Password => Box::new(PasswordLogin{}),
        }
    }
}

fn main() {
    let login = LoginManager::factory(&LoginType::Domain);
    login.verify("name".to_string(), "password".to_string());

    let login = LoginManager::factory(&LoginType::Password);
    login.verify("name".to_string(), "password".to_string());
}