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use super::*;
use crate::{
erased_types::IteratorItem,
utils::{transmute_mut_reference, transmute_reference},
};
macro_rules! declare_iter_interface {
(
$k: ident => $v: ident;
$(#[$attr: meta])*
interface = $interface: ident;
type Item = $item: ty;
) => (
#[repr(C)]
#[derive(StableAbi)]
$(#[$attr])*
pub struct $interface<$k, $v>(PhantomData<($k, $v)>);
impl<$k, $v> $interface<$k, $v>{
pub const NEW: Self = Self(PhantomData);
}
impl<'a, $k: 'a, $v: 'a> IteratorItem<'a> for $interface<$k, $v>{
type Item = $item;
}
)
}
declare_iter_interface! {
K => V;
#[sabi(impl_InterfaceType(Iterator, Clone))]
interface = RefIterInterface;
type Item = Tuple2<&'a K, &'a V>;
}
declare_iter_interface! {
K => V;
#[sabi(impl_InterfaceType(Iterator))]
interface = MutIterInterface;
type Item = Tuple2<&'a K, &'a mut V>;
}
declare_iter_interface! {
K => V;
#[sabi(impl_InterfaceType(Iterator))]
interface = ValIterInterface;
type Item = Tuple2<K, V>;
}
type IntoIterInner<'a, K, V> = DynTrait<'a, RBox<()>, ValIterInterface<K, V>>;
#[repr(transparent)]
#[derive(StableAbi)]
pub struct IntoIter<K, V> {
iter: IntoIterInner<'static, u32, u32>,
_marker: PhantomData<(K, V, UnsafeIgnoredType<std::rc::Rc<()>>)>,
}
impl<K, V> IntoIter<K, V> {
pub(super) unsafe fn new<'a>(iter: DynTrait<'a, RBox<()>, ValIterInterface<K, V>>) -> Self
where
K: 'a,
V: 'a,
{
IntoIter {
iter: mem::transmute::<IntoIterInner<'a, K, V>, IntoIterInner<'static, u32, u32>>(iter),
_marker: PhantomData,
}
}
#[inline]
fn iter(&self) -> &IntoIterInner<'_, K, V> {
unsafe { transmute_reference::<IntoIterInner<'static, u32, u32>, _>(&self.iter) }
}
#[inline]
fn iter_mut(&mut self) -> &mut IntoIterInner<'_, K, V> {
unsafe { transmute_mut_reference::<IntoIterInner<'static, u32, u32>, _>(&mut self.iter) }
}
}
impl<K, V> Iterator for IntoIter<K, V> {
type Item = Tuple2<K, V>;
#[inline]
fn next(&mut self) -> Option<Tuple2<K, V>> {
self.iter_mut().next()
}
#[inline]
fn nth(&mut self, nth: usize) -> Option<Tuple2<K, V>> {
self.iter_mut().nth(nth)
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter().size_hint()
}
#[inline]
fn count(mut self) -> usize {
self.iter_mut().by_ref().count()
}
#[inline]
fn last(mut self) -> Option<Tuple2<K, V>> {
self.iter_mut().by_ref().last()
}
}