rfc:constants_in_traits

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rfc:constants_in_traits [2022/07/02 01:17] – bump the version number sjirfc:constants_in_traits [2022/08/04 19:17] (current) – Move the status to implemented sji
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 ====== PHP RFC: Constants in Traits ====== ====== PHP RFC: Constants in Traits ======
-  * Version: 0.2+  * Version: 0.2.1
   * Date: 2022-06-21   * Date: 2022-06-21
   * Author: Shinji Igarashi<sji@sj-i.dev>, Stephen Reay<stephen@koalephant.com>   * Author: Shinji Igarashi<sji@sj-i.dev>, Stephen Reay<stephen@koalephant.com>
-  * Status: Under Discussion+  * Status: Implemented
   * Implementation: https://github.com/php/php-src/pull/8888   * Implementation: https://github.com/php/php-src/pull/8888
   * First Published at: http://wiki.php.net/rfc/constants_in_traits   * First Published at: http://wiki.php.net/rfc/constants_in_traits
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 <code php> <code php>
-intertface FooInterface {+interface FooInterface {
     public const FLAG_1 = 1;     public const FLAG_1 = 1;
     public function doFoo(int $flags): void;     public function doFoo(int $flags): void;
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 trait Foo { trait Foo {
     public const FLAG_1 = 1;     public const FLAG_1 = 1;
-    public const FLAG_2 = 2;+    protected const FLAG_2 = 2; 
 +    private const FLAG_3 = 2;
  
     public function doFoo(int $flags): void {     public function doFoo(int $flags): void {
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         if ($flags & self::FLAG_2) {         if ($flags & self::FLAG_2) {
             echo 'Got flag 2';             echo 'Got flag 2';
 +        }
 +        if ($flags & self::FLAG_3) {
 +            echo 'Got flag 3';
         }         }
     }     }
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         CONSTANT as private;         CONSTANT as private;
     }     }
 +}
 +</code>
 +
 +==== Can be used in Enum ====
 +Enumerations can use traits having constants, which behave as if the constants were defined within the enumeration.
 +
 +<code php>
 +trait T {
 +    private const CONSTANT = 42;
 +}
 +
 +// OK
 +enum E: int {
 +    use T;
 +
 +    case CaseA = self::CONSTANT;
 } }
 </code> </code>
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 ==== Rust ==== ==== Rust ====
-Rust has associated constants. Asociated constants are constants associated with a type. If multiple definitions of the same name conflict, they must be disambiguated on reference using qualified paths [[https://doc.rust-lang.org/reference/items/associated-items.html#associated-constants|[17]]][[https://doc.rust-lang.org/reference/paths.html#qualified-paths|[18]]].+Rust has associated constants. Associated constants are constants associated with a type. If multiple definitions of the same name conflict, they must be disambiguated on reference using qualified paths [[https://doc.rust-lang.org/reference/items/associated-items.html#associated-constants|[17]]][[https://doc.rust-lang.org/reference/paths.html#qualified-paths|[18]]].
  
 ==== C++ ==== ==== C++ ====
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-===== Proposed Voting Choices ===== +===== Vote ===== 
-A 2/3 majority is needed for this RFC to pass. Voting will start on 5. July 2022 and end on 19. July 2022+A 2/3 majority is needed for this RFC to pass. Voting started on 5. July 2022 and end on 19. July 2022 
 + 
 +<doodle title="Allow constants in traits as proposed?" auth="sji" voteType="single" closed="true"> 
 +   * Yes 
 +   * No 
 +</doodle>
  
  
rfc/constants_in_traits.1656724656.txt.gz · Last modified: 2022/07/02 01:17 by sji

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