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/// Pairwise filtering using bit masks. /// /// This filtering method is based on two 32-bit values: /// - The interaction groups memberships. /// - The interaction groups filter. /// /// An interaction is allowed between two filters `a` and `b` when two conditions /// are met simultaneously: /// - The groups membership of `a` has at least one bit set to `1` in common with the groups filter of `b`. /// - The groups membership of `b` has at least one bit set to `1` in common with the groups filter of `a`. /// /// In other words, interactions are allowed between two filter iff. the following condition is met: /// ```ignore /// (self.memberships & rhs.filter) != 0 && (rhs.memberships & self.filter) != 0 /// ``` #[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))] #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)] #[repr(C)] pub struct InteractionGroups { /// Groups memberships. pub memberships: u32, /// Groups filter. pub filter: u32, } impl InteractionGroups { /// Initializes with the given interaction groups and interaction mask. pub const fn new(memberships: u32, filter: u32) -> Self { Self { memberships, filter, } } /// Allow interaction with everything. pub const fn all() -> Self { Self::new(u32::MAX, u32::MAX) } /// Prevent all interactions. pub const fn none() -> Self { Self::new(0, 0) } /// Sets the group this filter is part of. pub const fn with_memberships(mut self, memberships: u32) -> Self { self.memberships = memberships; self } /// Sets the interaction mask of this filter. pub const fn with_filter(mut self, filter: u32) -> Self { self.filter = filter; self } /// Check if interactions should be allowed based on the interaction memberships and filter. /// /// An interaction is allowed iff. the memberships of `self` contain at least one bit set to 1 in common /// with the filter of `rhs`, and vice-versa. #[inline] pub const fn test(self, rhs: Self) -> bool { (self.memberships & rhs.filter) != 0 && (rhs.memberships & self.filter) != 0 } } impl Default for InteractionGroups { fn default() -> Self { Self::all() } }