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use alloc::boxed::Box;
use core::{future::Future, pin::Pin};
#[cfg(not(feature = "with_futures"))]
pub type SolverFuture<'a> = Pin<Box<dyn Future<Output = ()> + 'a>>;
#[cfg(feature = "with_futures")]
pub type SolverFuture<'a> = Pin<Box<dyn Future<Output = ()> + Send + Sync + 'a>>;
pub trait Solver<P> {
fn after_iter<'a>(&'a mut self, p: &'a mut P) -> SolverFuture<'a>;
fn before_iter<'a>(&'a mut self, p: &'a mut P) -> SolverFuture<'a>;
fn finished(&mut self, _: &mut P) {}
fn init(&mut self, _: &mut P) {}
}