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View Code? Open in Web Editor NEWA design for a language-integrated PHP generics library.
A design for a language-integrated PHP generics library.
php-generics-design-library/src/interfaces.php
Lines 5 to 6 in 728fde4
This would make more sense to me as
interface IteratorAggregate<out K = mixed, out V = mixed, out It: Traversable<K, V> = Traversable> extends Traversable<K, V>
One side affect you've possibly already considered is that that specific generic implementations of ArrayAccess
would not be compatible type-hinted ArrayAccess
The following would not work because K
is contravariant and V
is invariant to mixed
class MyArrayAccess<in K, V> implements ArrayAccess<K, V> { /* ... */ }
function foo(ArrayAccess $array) {}
foo(new MyArrayAccess<int, string>());
If ArrayAccess
was not generic, I believe that this would work fine.
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