Difference between revisions of "PHP/native/BackedEnum"

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(pseudocode in official doc did not include "function" in method declarations)
 
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Line 6: Line 6:
 
interface BackedEnum extends UnitEnum {
 
interface BackedEnum extends UnitEnum {
  
   static from(int|string $value): static;
+
   static function from(int|string $value): static;
   static tryFrom(int|string $value): ?static;
+
   static function tryFrom(int|string $value): ?static;
  
 
   string|int $value; // pseudocode
 
   string|int $value; // pseudocode
  
   // OVERRIDEs UnitEnum::cases()
+
   // INHERITED from UnitEnum (unmodified):
  static cases(): array;
 
  
   // INHERITED from UnitEnum (unmodified):
+
   static function cases(): array;
 
   string $name; // pseudocode
 
   string $name; // pseudocode
 
}
 
}
 
</syntaxhighlight>
 
</syntaxhighlight>
The member-variables are labelled "pseudocode" because a normal interface can't declare member-variables.
+
The member-variables are labelled "pseudocode" because a normal {{l/php|interface}} can't declare member-variables.
==cases()==
 
This method returns an array containing one element for each case in the enum:
 
* {{fmt/arg|array index}} (int) => {{fmt/arg|enum case-object}} (BackedEnum)
 
 
 
This list can then be used to build other arrays indexing the enum class's names, values, or calculated values.
 

Latest revision as of 14:24, 25 August 2024

BackedEnum pseudointerface
manual page: The BackedEnum interface

Note that this (pseudo)interface cannot actually be implemented as a standard class; it can only be (pseudo)implemented by declaring a backed enum.

Definition

interface BackedEnum extends UnitEnum {

   static function from(int|string $value): static;
   static function tryFrom(int|string $value): ?static;

   string|int $value; // pseudocode

   // INHERITED from UnitEnum (unmodified):

   static function cases(): array;
   string $name; // pseudocode
}

The member-variables are labelled "pseudocode" because a normal interface can't declare member-variables.