Difference between revisions of "PHP/native/UnitEnum"
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Note that this (pseudo){{l/php|interface}} cannot actually be implemented as a standard {{l/php|class}}; it can only be (pseudo)implemented by declaring an {{l/php|enum}}. | Note that this (pseudo){{l/php|interface}} cannot actually be implemented as a standard {{l/php|class}}; it can only be (pseudo)implemented by declaring an {{l/php|enum}}. | ||
| − | If an enum is "backed" (declared as having a scalar value for each choice), it will implement this interface | + | If an enum is "backed" (declared as having a scalar value for each choice), it will implement this interface and also the {{l/same|BackedEnum}} interface which (pseudo)inherits from this one.) |
==Definition== | ==Definition== | ||
<syntaxhighlight lang=php> | <syntaxhighlight lang=php> | ||
interface UnitEnum { | interface UnitEnum { | ||
| − | static function cases(): array | + | static function cases(): array; |
string $name; // pseudocode | string $name; // pseudocode | ||
} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | The member-variable is labelled "pseudocode" because a normal interface can't declare member-variables. | + | The member-variable is labelled "pseudocode" because a normal {{l/php|interface}} can't declare member-variables. |
==cases()== | ==cases()== | ||
This method returns an array containing one element for each case in the enum: | This method returns an array containing one element for each case in the enum: | ||
| Line 18: | Line 18: | ||
This list can then be used to build other arrays indexing the enum class's names and/or any other information known to each case. | This list can then be used to build other arrays indexing the enum class's names and/or any other information known to each case. | ||
| + | ==See Also== | ||
| + | * {{l/php/keyword|match}}() | ||
Latest revision as of 14:26, 25 August 2024
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UnitEnum pseudointerface manual page: The UnitEnum interface
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Note that this (pseudo)interface cannot actually be implemented as a standard class; it can only be (pseudo)implemented by declaring an enum.
If an enum is "backed" (declared as having a scalar value for each choice), it will implement this interface and also the BackedEnum interface which (pseudo)inherits from this one.)
Definition
interface UnitEnum {
static function cases(): array;
string $name; // pseudocode
}
The member-variable is labelled "pseudocode" because a normal interface can't declare member-variables.
cases()
This method returns an array containing one element for each case in the enum:
- <array index> (int) => <enum case-object> (BackedEnum)
This list can then be used to build other arrays indexing the enum class's names and/or any other information known to each case.
See Also
match()