<?php
  
  namespace Illuminate\Contracts\Auth;
  
  interface Guard
  {
      /**
       * Determine if the current user is authenticated.
       *
       * @return bool
       */
      public function check();
  
      /**
       * Determine if the current user is a guest.
       *
       * @return bool
       */
      public function guest();
  
      /**
       * Get the currently authenticated user.
       *
       * @return \Illuminate\Contracts\Auth\Authenticatable|null
       */
      public function user();
  
      /**
       * Get the ID for the currently authenticated user.
       *
       * @return int|string|null
       */
      public function id();
  
      /**
       * Validate a user's credentials.
       *
       * @param  array  $credentials
       * @return bool
       */
      public function validate(array $credentials = []);
  
      /**
       * Set the current user.
       *
       * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
       * @return void
       */
      public function setUser(Authenticatable $user);
  }