Current user object in class without create Service

After login, I want current user object in my class without creating service. Becauase I had already create current user pluggin and helper.

So If i need current user object in my class then How to get current user object.

i.e,

class CoreFunction
{
    public static curentUserData()
    {
       // i want user object here
    }

}

In Zend Framework 2, I just used:

class CoreFunction
{
    public static curentUserData() {         
        $authService = $this->getServiceLocator()
                    ->get('Zend\Authentication\AuthenticationService')
                    ->getIdentity();
    }
}

How can I do this in Zend Framework 3?