rfc:intersection_types

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
Next revisionBoth sides next revision
rfc:intersection_types [2016/04/27 17:28] – levimrfc:intersection_types [2016/04/27 17:56] – levim
Line 29: Line 29:
  
 // 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>
Line 43: Line 43:
 </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 {
Line 58: Line 58:
 } }
 </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 =====
rfc/intersection_types.txt · Last modified: 2017/09/22 13:28 by 127.0.0.1

Page Tools