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use crate::geometry::ParticlesContacts;
use crate::math::Real;
use crate::object::{Boundary, Fluid};
use crate::TimestepManager;
pub trait NonPressureForce: Send + Sync {
fn solve(
&mut self,
timestep: &TimestepManager,
kernel_radius: Real,
fluid_fluid_contacts: &ParticlesContacts,
fluid_boundaries_contacts: &ParticlesContacts,
fluid: &mut Fluid,
boundaries: &[Boundary],
densities: &[Real],
);
fn apply_permutation(&mut self, _permutation: &[usize]) {}
}