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  1. <?php
  2.  
  3. // your code goes here
  4.  
  5. trait BoxedValue {
  6. 	private $boxed_value;
  7. 	public function __construct($value) { $this->boxed_value = $value; }
  8. 	public function value() { return $this->boxed_value; }
  9. }
  10.  
  11. trait MyBool {
  12. 	abstract public function isTrue() : bool;
  13. 	public function isFalse() : bool { return !$this->isTrue(); }
  14. }
  15.  
  16. trait Num {
  17. 	abstract public function plus($num);
  18. 	abstract public function negate($num);
  19. 	public function minus($num) { return $this->plus($num->negate()); }
  20. }
  21.  
  22. class BoolNum {
  23. 	use BoxedValue, MyBool, Num;
  24.  
  25. 	public function isTrue() : bool {
  26. 		return $this->value() != 0;	
  27. 	}
  28.  
  29. 	public function plus($num) {
  30. 		return new BoolNum($this->value() + $num->value());
  31. 	}
  32.  
  33. 	public function negate() {
  34. 		return new BoolNum(- $this->value());
  35. 	}
  36.  
  37. }
  38.  
  39. $a = new BoolNum(-5);
  40. $b = new BoolNum(10);
  41. $c = new BoolNum(0);
  42.  
  43.  
  44. var_dump($a->isTrue());
  45. var_dump($b->isFalse());
  46. var_dump($c->isTrue());
  47. var_dump($c->isFalse());
  48.  
  49.  
  50. var_dump($a->plus($b));
  51. var_dump($a->minus($b));
  52.  
Success #stdin #stdout 0.01s 82560KB
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stdin
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Standard input is empty
stdout
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bool(true)
bool(false)
bool(false)
bool(true)
object(BoolNum)#4 (1) {
  ["boxed_value":"BoolNum":private]=>
  int(5)
}
object(BoolNum)#5 (1) {
  ["boxed_value":"BoolNum":private]=>
  int(-15)
}
https://ideone.com/jZYlWs
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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