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use super::abstract_mut::FastAbstractMut;
use super::iter::FastIter;
use super::mixed::FastMixed;
#[cfg(feature = "parallel")]
use super::par_iter::FastParIter;
use super::tight::FastTight;
use crate::entity_id::EntityId;
use crate::iter::abstract_mut::AbstractMut;
use crate::iter::into_abstract::IntoAbstract;
use crate::sparse_set::SparseSet;
use crate::type_id::TypeId;
use core::ptr;
const ACCESS_FACTOR: usize = 3;
/// Trait used to create iterators.
/// Yields `&mut T` for mutable components. Does not work with storage tracking modification.
///
/// `std::iter::IntoIterator` can't be used directly because of conflicting implementation.
/// This trait serves as substitute.
pub trait IntoFastIter {
#[allow(missing_docs)]
type IntoIter: Iterator;
#[cfg(feature = "parallel")]
#[allow(missing_docs)]
type IntoParIter;
/// Returns an iterator over `SparseSet`.
/// Panics if one of the storage is tracking modification.
/// You can check if a `SparseSet` is tracking modification with [`SparseSet::is_tracking_modification`].
///
/// [`iter`] can be used for storage tracking modification.
///
/// ### Example
/// ```
/// use shipyard::{EntitiesViewMut, IntoFastIter, ViewMut, World};
///
/// let world = World::new();
///
/// let (mut entities, mut usizes, mut u32s) = world.borrow::<(EntitiesViewMut, ViewMut<usize>, ViewMut<u32>)>().unwrap();
///
/// entities.add_entity((&mut usizes, &mut u32s), (0usize, 1u32));
/// entities.add_entity((&mut usizes, &mut u32s), (2usize, 3u32));
///
/// (&mut usizes, &u32s).fast_iter().for_each(|(x, &y)| {
/// *x += y as usize;
/// });
/// ```
/// [`SparseSet::is_tracking_modification`]: crate::SparseSet::is_tracking_modification()
/// [`iter`]: crate::IntoIter
fn fast_iter(self) -> Self::IntoIter;
/// Returns an iterator over `SparseSet`, its order is based on `D`.
/// Panics if one of the storage is tracking modification.
/// You can check if a `SparseSet` is tracking modification with [`SparseSet::is_tracking_modification`].
///
/// [`iter_by`] can be used for storage tracking modification.
///
/// [`SparseSet::is_tracking_modification`]: crate::SparseSet::is_tracking_modification()
/// [`iter_by`]: crate::IntoIter
fn fast_iter_by<D: 'static>(self) -> Self::IntoIter;
/// Returns a parallel iterator over `SparseSet`.
/// Panics if one of the storage is tracking modification.
/// You can check if a `SparseSet` is tracking modification with [`SparseSet::is_tracking_modification`].
///
/// [`par_iter`] can be used for storage tracking modification.
///
/// ### Example
/// ```
/// use rayon::prelude::ParallelIterator;
/// use shipyard::{EntitiesViewMut, IntoFastIter, ViewMut, World};
///
/// let world = World::new();
///
/// let (mut entities, mut usizes, mut u32s) = world.borrow::<(EntitiesViewMut, ViewMut<usize>, ViewMut<u32>)>().unwrap();
///
/// entities.add_entity((&mut usizes, &mut u32s), (0usize, 1u32));
/// entities.add_entity((&mut usizes, &mut u32s), (2usize, 3u32));
///
/// (&mut usizes, &u32s).fast_par_iter().for_each(|(x, &y)| {
/// *x += y as usize;
/// });
/// ```
/// [`SparseSet::is_tracking_modification`]: crate::SparseSet::is_tracking_modification()
/// [`par_iter`]: crate::IntoIter
#[cfg(feature = "parallel")]
fn fast_par_iter(self) -> Self::IntoParIter;
}
impl<T: IntoAbstract> IntoFastIter for T
where
T::AbsView: FastAbstractMut,
<T::AbsView as AbstractMut>::Index: Clone,
{
type IntoIter = FastIter<T::AbsView>;
#[cfg(feature = "parallel")]
type IntoParIter = FastParIter<T::AbsView>;
#[inline]
#[track_caller]
fn fast_iter(self) -> Self::IntoIter {
if !self.is_tracking_insertion() && !self.is_tracking_modification()
|| self.len().map(|(_, is_exact)| !is_exact).unwrap_or(true)
{
match self.len() {
Some((len, true)) => FastIter::Tight(FastTight {
current: 0,
end: len,
storage: self.into_abstract(),
}),
Some((len, false)) => FastIter::Mixed(FastMixed {
indices: self.dense(),
storage: self.into_abstract(),
current: 0,
end: len,
mask: 0,
last_id: EntityId::dead(),
}),
None => FastIter::Tight(FastTight {
current: 0,
end: 0,
storage: self.into_abstract(),
}),
}
} else {
panic!("fast_iter can't be used with storage is tracking modification except if you iterate on Inserted or Modified.");
}
}
#[track_caller]
#[inline]
fn fast_iter_by<D: 'static>(self) -> Self::IntoIter {
self.fast_iter()
}
#[cfg(feature = "parallel")]
#[track_caller]
#[inline]
fn fast_par_iter(self) -> Self::IntoParIter {
self.fast_iter().into()
}
}
impl<T: IntoAbstract> IntoFastIter for (T,)
where
T::AbsView: FastAbstractMut,
<T::AbsView as AbstractMut>::Index: From<usize> + Clone,
{
type IntoIter = FastIter<(T::AbsView,)>;
#[cfg(feature = "parallel")]
type IntoParIter = FastParIter<(T::AbsView,)>;
#[inline]
fn fast_iter(self) -> Self::IntoIter {
if !self.0.is_tracking_insertion() && !self.0.is_tracking_modification()
|| self.0.len().map(|(_, is_exact)| !is_exact).unwrap_or(true)
{
match self.0.len() {
Some((len, true)) => FastIter::Tight(FastTight {
current: 0,
end: len,
storage: (self.0.into_abstract(),),
}),
Some((len, false)) => FastIter::Mixed(FastMixed {
indices: self.0.dense(),
storage: (self.0.into_abstract(),),
current: 0,
end: len,
mask: 0,
last_id: EntityId::dead(),
}),
None => FastIter::Tight(FastTight {
current: 0,
end: 0,
storage: (self.0.into_abstract(),),
}),
}
} else {
panic!("fast_iter can't be used with storage is tracking modification except if you iterate on Inserted or Modified.");
}
}
#[inline]
fn fast_iter_by<D: 'static>(self) -> Self::IntoIter {
self.fast_iter()
}
#[cfg(feature = "parallel")]
#[inline]
fn fast_par_iter(self) -> Self::IntoParIter {
self.fast_iter().into()
}
}
macro_rules! impl_into_iter {
(($type1: ident, $index1: tt) $(($type: ident, $index: tt))+) => {
impl<$type1: IntoAbstract, $($type: IntoAbstract),+> IntoFastIter for ($type1, $($type,)+) where $type1::AbsView: FastAbstractMut, $($type::AbsView: FastAbstractMut,)+ <$type1::AbsView as AbstractMut>::Index: From<usize> + Clone, $(<$type::AbsView as AbstractMut>::Index: From<usize> + Clone),+ {
type IntoIter = FastIter<($type1::AbsView, $($type::AbsView,)+)>;
#[cfg(feature = "parallel")]
type IntoParIter = FastParIter<($type1::AbsView, $($type::AbsView,)+)>;
#[allow(clippy::drop_copy)]
fn fast_iter(self) -> Self::IntoIter {
if self.$index1.is_tracking_insertion() || self.$index1.is_tracking_modification()
&& self.$index1.len().map(|(_, is_exact)| is_exact).unwrap_or(false)
{
panic!("fast_iter can't be used with storage is tracking modification except if you iterate on Inserted or Modified.");
}
let type_ids = [self.$index1.type_id(), $(self.$index.type_id()),+];
let mut smallest = core::usize::MAX;
let mut smallest_dense = ptr::null();
let mut mask: u16 = 0;
let mut factored_len = core::usize::MAX;
if let Some((len, is_exact)) = self.$index1.len() {
smallest = len;
smallest_dense = self.$index1.dense();
if is_exact {
factored_len = len + len * (type_ids.len() - 1) * ACCESS_FACTOR;
mask = 1 << $index1;
} else {
factored_len = len * type_ids.len() * ACCESS_FACTOR;
}
}
$(
if self.$index.is_tracking_insertion() || self.$index.is_tracking_modification()
&& self.$index.len().map(|(_, is_exact)| is_exact).unwrap_or(false)
{
panic!("fast_iter can't be used with storage is tracking modification except if you iterate on Inserted or Modified.");
}
if let Some((len, is_exact)) = self.$index.len() {
if is_exact {
let factor = len + len * (type_ids.len() - 1) * ACCESS_FACTOR;
if factor < factored_len {
smallest = len;
smallest_dense = self.$index.dense();
mask = 1 << $index;
factored_len = factor;
}
} else {
let factor = len * type_ids.len() * ACCESS_FACTOR;
if factor < factored_len {
smallest = len;
smallest_dense = self.$index.dense();
mask = 0;
factored_len = factor;
}
}
}
)+
drop(factored_len);
if smallest == core::usize::MAX {
FastIter::Mixed(FastMixed {
current: 0,
end: 0,
mask,
indices: smallest_dense,
last_id: EntityId::dead(),
storage: (self.$index1.into_abstract(), $(self.$index.into_abstract(),)+),
})
} else {
FastIter::Mixed(FastMixed {
current: 0,
end: smallest,
mask,
indices: smallest_dense,
last_id: EntityId::dead(),
storage: (self.$index1.into_abstract(), $(self.$index.into_abstract(),)+),
})
}
}
fn fast_iter_by<Driver: 'static>(self) -> Self::IntoIter {
if self.$index1.is_tracking_insertion() || self.$index1.is_tracking_modification()
&& self.$index1.len().map(|(_, is_exact)| is_exact).unwrap_or(false)
{
panic!("fast_iter_by can't be used with storage is tracking modification except if you iterate on Inserted or Modified.");
}
let type_id = TypeId::of::<SparseSet<Driver>>();
let mut found = false;
let mut smallest = core::usize::MAX;
let mut smallest_dense = ptr::null();
let mut mask: u16 = 0;
if self.$index1.type_id() == type_id {
found = true;
match self.$index1.len() {
Some((len, is_exact)) => {
if is_exact {
smallest = len;
smallest_dense = self.$index1.dense();
mask = 1 << $index1;
} else {
smallest = len;
smallest_dense = self.$index1.dense();
}
}
None => {}
}
}
$(
if self.$index.is_tracking_insertion() || self.$index.is_tracking_modification()
&& self.$index.len().map(|(_, is_exact)| is_exact).unwrap_or(false)
{
panic!("fast_iter_by can't be used with storage is tracking modification except if you iterate on Inserted or Modified.");
}
if !found && self.$index.type_id() == type_id {
found = true;
match self.$index.len() {
Some((len, is_exact)) => {
if is_exact {
smallest = len;
smallest_dense = self.$index.dense();
mask = 1 << $index;
} else {
smallest = len;
smallest_dense = self.$index.dense();
}
}
None => {}
}
}
)+
if found {
if smallest == core::usize::MAX {
FastIter::Mixed(FastMixed {
current: 0,
end: 0,
mask,
indices: smallest_dense,
last_id: EntityId::dead(),
storage: (self.$index1.into_abstract(), $(self.$index.into_abstract(),)+),
})
} else {
FastIter::Mixed(FastMixed {
current: 0,
end: smallest,
mask,
indices: smallest_dense,
last_id: EntityId::dead(),
storage: (self.$index1.into_abstract(), $(self.$index.into_abstract(),)+),
})
}
} else {
self.fast_iter()
}
}
#[cfg(feature = "parallel")]
#[inline]
fn fast_par_iter(self) -> Self::IntoParIter {
self.fast_iter().into()
}
}
}
}
macro_rules! into_iter {
($(($type: ident, $index: tt))+; ($type1: ident, $index1: tt) $(($queue_type: ident, $queue_index: tt))*) => {
impl_into_iter![$(($type, $index))+];
into_iter![$(($type, $index))* ($type1, $index1); $(($queue_type, $queue_index))*];
};
($(($type: ident, $index: tt))+;) => {
impl_into_iter![$(($type, $index))*];
}
}
into_iter![(A, 0) (B, 1); (C, 2) (D, 3) (E, 4) (F, 5) (G, 6) (H, 7) (I, 8) (J, 9)];