rfc:treat_enum_instances_as_values

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rfc:treat_enum_instances_as_values [2023/04/28 21:49] – Removed unused sections suitespacerndrfc:treat_enum_instances_as_values [2023/04/29 06:52] – Intro grammar suitespacernd
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 This RFC proposes to allow the use of enum instances as array keys in PHP. More specifically, where errors are produces in any context where an enum instance is used without ->value or ->name, the engine should instead assume ->value. This RFC proposes to allow the use of enum instances as array keys in PHP. More specifically, where errors are produces in any context where an enum instance is used without ->value or ->name, the engine should instead assume ->value.
  
-This change aims to enhance the usability and consistency of enums in PHP by treating enum instances as symbols of their respective values - especially in the context of array keys. This will allow large amounts of existing code in various C-style languages to be compatible with PHP usage without affecting current projects. Further, this enables potential future RFC to enable array key type constraints in line with present == vs === semantics and ArrayAccess, without drastic engine overhauls.+This change aims to enhance the usability and consistency of enums in PHP by treating enum instances as symbols of their respective values - especially in the context of array keys. This will allow large amounts of existing code in various C-style languages to be compatible with PHP usage without affecting current projects.  
 + 
 +Further, this proposal provides potential future RFC a path to enable array key type constraints in line with present == vs === semantics and ArrayAccess, without drastic engine overhauls.
  
  
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    $palette = [    $palette = [
        1 => 'Red',        1 => 'Red',
-      2 => 'Green',+       2 => 'Green',
        3 => 'Blue',        3 => 'Blue',
    ];    ];
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       public function offsetGet(Month $which){       public function offsetGet(Month $which){
 +         //...
 +      }
 +   
 +   //...
 +   }
 +   class YourType implements ArrayAccess
 +   //...
 +   
 +      public function offsetGet($mixed $which){
          //...          //...
       }       }
Line 120: Line 131:
  
    $myobj = new MyType();    $myobj = new MyType();
 +   $yourobj = new YourType();
    $x = $myobj[Color::Yellow];   // error    $x = $myobj[Color::Yellow];   // error
 +   $y = $yourobj[Color::Yellow]; // fine
  
 Such a roadmap finally enables users to user to simply use match($this) and other userland syntactic sugar to simulate object keys. This gap can be further reduced and optimized from there. Such a roadmap finally enables users to user to simply use match($this) and other userland syntactic sugar to simulate object keys. This gap can be further reduced and optimized from there.
rfc/treat_enum_instances_as_values.txt · Last modified: 2023/04/29 11:04 by suitespacernd

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