hphp/hack/test/typecheck/trait_require_inherit.php

   1 <?hh
   2 /**
   3  * Copyright (c) 2014, Facebook, Inc.
   4  * All rights reserved.
   5  *
   6  * This source code is licensed under the BSD-style license found in the
   7  * LICENSE file in the "hack" directory of this source tree. An additional grant
   8  * of patent rights can be found in the PATENTS file in the same directory.
   9  *
  10  */
  11
  12 interface IParent {
  13   const FOO = 'bar';
  14
  15   public abstract function whatevs();
  16 }
  17
  18 abstract class ParentClass implements IParent {
  19   protected function bar() {}
  20 }
  21
  22 abstract class Kid extends ParentClass {
  23 }
  24
  25 class Grandkid extends Kid {
  26   use KidTrait;
  27
  28   public function whatevs() {}
  29 }
  30
  31 trait KidTrait {
  32   require extends Kid;
  33
  34   protected function foo() {
  35     $this->bar().self::FOO.$this->whatevs();
  36   }
  37 }
  38
  39 trait KidTraitChild {
  40   use KidTrait;
  41
  42   protected function another_foo() {
  43     $this->bar().self::FOO.$this->whatevs();
  44   }
  45 }