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#[macro_export]
macro_rules! one_of {
(@IntoQuery $q:ty) => {
<$q as $crate::query::IntoQuery>::Query
};
// (@IntoQuery &'a mut $a:ty) => {
// $crate::query::Write<$a>
// };
(@Fetch $q:ty) => {
<<$q as $crate::query::IntoQuery>::Query as $crate::query::Query>::Fetch<'a>
};
// (@Fetch &'a mut $a:ty) => {
// $crate::query::FetchWrite<'a, $a>
// };
(@MUTABLE $q:ty) => {
<<$q as $crate::query::IntoQuery>::Query as $crate::query::Query>::MUTABLE
};
// (@MUTABLE &'a mut $a:ty) => {
// true
// };
(@DANGLING_FETCH $v:ident, $($rest:ident,)*) => {
OneOfFetch::$v($crate::query::Fetch::dangling())
};
($vis:vis $name:ident <'a> {
$($v:ident ( $q:ty )),+ $(,)?
}) => {
$vis enum $name<'a> {
$($v($q),)+
}
#[allow(non_snake_case)]
#[allow(unused_parens)]
const _: () = {
$vis enum OneOfFetch<'a> {
$($v( $crate::one_of!(@Fetch $q) ),)+
}
#[allow(unused_parens)]
#[allow(non_snake_case)]
unsafe impl Fetch<'a> for OneOfFetch<'a> {
type Item = $name<'a>;
#[inline(always)]
fn dangling() -> Self {
$crate::one_of!(@DANGLING_FETCH $($v,)+)
}
#[inline(always)]
unsafe fn visit_chunk(&mut self, chunk_idx: u32) -> bool {
match self {
$(OneOfFetch::$v($v) => unsafe {
$crate::query::Fetch::visit_chunk($v, chunk_idx)
},)+
}
}
/// Checks if item with specified index must be visited or skipped.
#[inline(always)]
unsafe fn visit_item(&mut self, idx: u32) -> bool {
match self {
$(OneOfFetch::$v($v) => unsafe {
$crate::query::Fetch::visit_item($v, idx)
},)+
}
}
/// Notifies this fetch that it visits a chunk.
#[inline(always)]
unsafe fn touch_chunk(&mut self, chunk_idx: u32) {
match self {
$(OneOfFetch::$v($v) => unsafe {
$crate::query::Fetch::touch_chunk($v, chunk_idx)
},)+
}
}
#[inline(always)]
unsafe fn get_item(&mut self, idx: u32) -> $name<'a> {
match self {
$(OneOfFetch::$v($v) => unsafe {
$name::$v($crate::query::Fetch::get_item($v, idx))
},)+
}
}
}
// $vis struct OneOf;
// impl $crate::query::IntoQuery for $name<'_> {
// type Query = OneOf;
// }
// impl DefaultQuery for $name<'_> {
// #[inline(always)]
// fn default_query() -> OneOf {
// OneOf
// }
// }
// impl $crate::query::QueryArg for $name<'_> {
// #[inline(always)]
// fn new() -> OneOf {
// OneOf
// }
// }
// #[allow(non_snake_case)]
// #[allow(unused_parens)]
// impl $crate::query::Query for OneOf {
// type Item<'a> = $name<'a>;
// type Fetch<'a> = OneOfFetch<'a>,
// const MUTABLE: bool = $($crate::one_of!(@MUTABLE $q) ||)+ false;
// const FILTERS_ENTITIES: bool = false;
// fn component_access(&self, ty: core::any::TypeId) -> Result<Option<Access>, WriteAlias> {
// $(
// let $v = $crate::one_of!(@IntoQuery &'a $q);
// match $crate::query::Query::component_access(&$v, ty)? {
// None => {},
// Some(access) => return Ok(Some(access)),
// };
// )*
// Ok(None)
// }
// #[inline(always)]
// fn visit_archetype(&self, archetype: &Archetype) -> bool {
// $(let $v = $crate::one_of!(@IntoQuery &'a $q);)+
// $( $crate::query::Query::visit_archetype(&$v, archetype) )||+
// }
// #[inline(always)]
// unsafe fn access_archetype(&self, archetype: &Archetype, mut f: impl FnMut(TypeId, Access)) {
// $(
// let $v = $crate::one_of!(@IntoQuery &'a $q);
// if $crate::query::Query::visit_archetype(&$v, archetype) {
// $crate::query::Query::access_archetype(&$v, archetype, &mut f);
// return;
// }
// )+
// }
// #[inline(always)]
// unsafe fn fetch<'a>(&self, arch_idx: u32, archetype: &'a Archetype, epoch: EpochId) -> OneOfFetch<'a> {
// $(let $v = $crate::one_of!(@IntoQuery &'a $q);)+
// $(
// if $crate::query::Query::visit_archetype(&$v, archetype) {
// return OneOfFetch::$v($crate::query::Query::fetch(&$v, arch_idx, archetype, epoch));
// }
// )+
// unsafe {
// core::hint::unreachable_unchecked()
// }
// }
// #[inline(always)]
// fn reserved_entity_item<'a>(&self, _id: EntityId, _idx: u32) -> Option<$name<'a>> {
// None
// }
// }
};
};
}