sparsey 0.13.3

Entity Component System based on sparse sets
Documentation 
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use crate::component::{StorageMask, MAX_GROUP_COUNT};
use core::fmt;
use core::ops::{BitAnd, BitAndAssign, BitOr, BitOrAssign};

#[derive(Clone, Copy, PartialEq, Eq, Hash, Default)]
pub(crate) struct GroupMask(pub u64);

impl GroupMask {
    pub const EMPTY: Self = Self(0);

    #[inline]
    #[must_use]
    pub const fn from_to(from: usize, to: usize) -> Self {
        assert!(from < MAX_GROUP_COUNT);
        assert!(to < MAX_GROUP_COUNT);
        assert!(from <= to);

        Self(((1 << (to - from)) - 1) << from)
    }

    #[inline]
    #[must_use]
    pub const fn skip_from_to(from: usize, to: usize) -> Self {
        assert!(from < MAX_GROUP_COUNT);
        assert!(to < MAX_GROUP_COUNT);
        assert!(from <= to);

        Self(!(((1 << (to - from)) - 1) << from))
    }

    #[inline]
    pub const fn iter_bit_indexes(self) -> BitIndexIter {
        BitIndexIter(self.0)
    }
}

impl BitAnd for GroupMask {
    type Output = Self;

    #[inline]
    fn bitand(self, rhs: Self) -> Self::Output {
        Self(self.0 & rhs.0)
    }
}

impl BitAndAssign for GroupMask {
    #[inline]
    fn bitand_assign(&mut self, rhs: Self) {
        self.0 &= rhs.0;
    }
}

impl BitOr for GroupMask {
    type Output = Self;

    #[inline]
    fn bitor(self, rhs: Self) -> Self::Output {
        Self(self.0 | rhs.0)
    }
}

impl BitOrAssign for GroupMask {
    #[inline]
    fn bitor_assign(&mut self, rhs: Self) {
        self.0 |= rhs.0;
    }
}

impl fmt::Debug for GroupMask {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{:0>64b}", self.0)
    }
}

#[repr(align(4))]
#[derive(Clone, Copy, PartialEq, Eq, Hash, Default, Debug)]
pub(crate) struct QueryMask {
    pub include: StorageMask,
    pub exclude: StorageMask,
}

impl QueryMask {
    #[inline]
    #[must_use]
    pub fn include(arity: usize) -> Self {
        Self {
            include: StorageMask::from_to(0, arity),
            exclude: StorageMask::EMPTY,
        }
    }

    #[inline]
    #[must_use]
    pub fn exclude(prev_arity: usize, arity: usize) -> Self {
        Self {
            include: StorageMask::from_to(0, prev_arity),
            exclude: StorageMask::from_to(prev_arity, arity),
        }
    }
}

#[must_use]
#[derive(Clone, Debug)]
pub(crate) struct BitIndexIter(pub u64);

impl Iterator for BitIndexIter {
    type Item = u32;

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        if self.0 == 0 {
            return None;
        }

        let trailing_zeros = self.0.trailing_zeros();
        self.0 &= !(1 << trailing_zeros);
        Some(trailing_zeros)
    }
}

impl DoubleEndedIterator for BitIndexIter {
    #[inline]
    fn next_back(&mut self) -> Option<Self::Item> {
        if self.0 == 0 {
            return None;
        }

        let index = 63 - self.0.leading_zeros();
        self.0 &= !(1 << index);
        Some(index)
    }
}