Hello internals! I apologize if such a discussion has already taken place, but
I didn't find anything like it.
When working with enums, I ran into problems that are currently not resolved.
In some cases, enumerations require self references and constant arithmetic
expressions:
enum Example: int
{
case A = 0b0001;
case B = 0b0010;
case C = 0b0100;
public const EXAMPLE_MASK = self::A | self::B; // << Invalid expression
public const EXAMPLE_MASK2 = self::A->value | self::B->value; // << Same
}
Similar examples can be taken in the existing PHP code, for example, for
attributes (Attribute::TARGET_ALL) which is a binary mask for existing
«targets». Thus, if targets for attributes were implemented through
enumerations, and not through constants, then it would be impossible to
implement such functionality.
In addition, enumeration values are not part of constant expressions, so
implementation through "Example::A->value" is also not available.
Can you please tell me, maybe there have already been some discussions of this
problem? And if not, then maybe we should solve this problem before PHP 8.1
release? Since it seems to me that the lack of such functionality is quite
critical.
--
Kirill Nesmeyanov
