pumpkin-propagators 0.4.0

The propagators of the Pumpkin constraint programming solver.
Documentation 
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use std::fmt::Debug;
use std::hash::Hash;
use std::rc::Rc;

use pumpkin_core::propagation::LocalId;
use pumpkin_core::variables::IntegerVariable;

/// Structure which stores the variables related to a task; for now, only the start times are
/// assumed to be variable
#[derive(Debug)]
pub(crate) struct Task<Var> {
    /// The variable representing the start time of a task
    pub(crate) start_variable: Var,
    /// The processing time of the `start_variable` (also referred to as duration of a task)
    pub(crate) processing_time: i32,
    /// How much of the resource the given task uses during its non-preemptive execution
    pub(crate) resource_usage: i32,
    /// The [`LocalId`] of the task
    pub(crate) id: LocalId,
}

impl<Var: IntegerVariable + 'static> Task<Var> {
    pub(crate) fn get_id(task: &Rc<Task<Var>>) -> usize {
        task.id.unpack() as usize
    }
}

impl<Var: IntegerVariable + 'static> Hash for Task<Var> {
    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
        self.id.hash(state);
    }
}

impl<Var: IntegerVariable + 'static> PartialEq for Task<Var> {
    fn eq(&self, other: &Self) -> bool {
        self.id.unpack() == other.id.unpack()
    }
}

impl<Var: IntegerVariable + 'static> Eq for Task<Var> {}

/// The task which is passed as argument
#[derive(Clone, Debug)]
pub struct ArgTask<Var> {
    /// The [`IntegerVariable`] representing the start time of a task
    pub start_time: Var,
    /// The processing time of the [`start_time`][ArgTask::start_time] (also referred to as
    /// duration of a task)
    pub processing_time: i32,
    /// How much of the resource the given task uses during its non-preemptive execution
    pub resource_usage: i32,
}