rfc:intersection_types

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rfc:intersection_types [2016/04/27 17:28] – levimrfc:intersection_types [2016/04/28 03:55] – levim
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   * Date: 2016-04-27   * Date: 2016-04-27
   * Author: Levi Morrison <levim@php.net>   * Author: Levi Morrison <levim@php.net>
-  * Status: Draft+  * Status: Under Discussion
   * First Published at: http://wiki.php.net/rfc/intersection_types   * First Published at: http://wiki.php.net/rfc/intersection_types
  
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 // Fatal error: Uncaught TypeError: Argument 1 passed to RecordsToList() must be Countable and Traversable, array given, called in %s on line %d // Fatal error: Uncaught TypeError: Argument 1 passed to RecordsToList() must be Countable and Traversable, array given, called in %s on line %d
-echo RecordsToHtml(["Lennon", "McCartney", "Starr", "Harrison"]);+echo RecordsToList(["Lennon", "McCartney", "Starr", "Harrison"]);
  
 // Fine: // Fine:
-echo RecordsToHtml(new ArrayObject(["Lennon", "McCartney", "Starr", "Harrison"]));+echo RecordsToList(new ArrayObject(["Lennon", "McCartney", "Starr", "Harrison"]));
 // Output: // Output:
 // <ol> // <ol>
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 </PHP> </PHP>
  
-Note that if [[rfc:union_types|Union Types]] are also accepted then something like this will be possible, allowing for an array or an object that satisfies both constraints:+Note that if [[rfc:union_types|Union Types]] are also accepted then something like this will be possible, allowing for an array or an object that satisfies both Countable and Traversable:
 <PHP> <PHP>
 function RecordsToList(Array | (Countable & Traversable) $input): String { function RecordsToList(Array | (Countable & Traversable) $input): String {
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 } }
 </PHP> </PHP>
 +
 +When union and intersection types are in the same expression they must be grouped with parenthesis (demonstrated above). The following is invalid:
 +
 +<PHP>
 +function RecordsToList(Array | Countable & Traversable): String {
 +    // ...
 +}
 +</PHP>
 +
  
 ===== Backward Incompatible Changes ===== ===== Backward Incompatible Changes =====
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 ===== References ===== ===== References =====
-Original announcement on Mailing List of rationale for this feature: http://news.php.net/php.internals/92252+  * Original announcement on Mailing List of rationale for this feature: http://news.php.net/php.internals/92252 
 +  * Announcement for discussion phase: http://news.php.net/php.internals/92857
  
rfc/intersection_types.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

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