On 09/18/2015 10:42 AM, Anthony Ferrara wrote:
As far as enums, I wonder if they would be necessary if we supported
algebraic types, since you could define an "enum" as a virtual type:
const MONDAY = 0;
const TUESDAY = 1;
const WEDNESDAY = 2;
const THURSDAY = 3;
const FRIDAY = 4;
use MONDAY | TUESDAY | WEDNESDAY | THURSDAY | FRIDAY as WEEKDAY;
function foo(WEEKDAY $day) {
// must be an integer 0-4, or castable to 0-4 unless strict_types is on.
}
Just a thought...
Anthony
Thats the kind of functionality I would expect from enums, but having a
dedicated syntax for it would be better for code organization and
documentation. Is much better to document:
/**
* Days of the week for blah blah.
*/
enum Weekday {...}
Its purpose would be much clear than documenting this:
use MONDAY | TUESDAY | WEDNESDAY | THURSDAY | FRIDAY as WEEKDAY;
Also documentation generators like phpdocumentor or apigen could
generate a list of enum declarations with its descriptions and values.
Also when type hinting a function parameter like in your example it can
be a link to the enum definition on documentation.
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