solverforge 0.11.1

SolverForge - A constraint solver in Rust
Documentation 
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use solverforge::prelude::*;

use super::Plan;

#[planning_entity]
pub struct Task {
    #[planning_id]
    pub id: usize,

    #[planning_variable(
        value_range_provider = "workers",
        allows_unassigned = true,
        nearby_value_distance_meter = "worker_value_distance",
        nearby_entity_distance_meter = "task_distance",
        construction_entity_order_key = "task_priority",
        construction_value_order_key = "worker_priority"
    )]
    pub worker: Option<usize>,
}

pub(super) fn worker_value_distance(_plan: &Plan, task: &Task, worker: usize) -> f64 {
    task.id.abs_diff(worker) as f64
}

pub(super) fn task_distance(_plan: &Plan, left: &Task, right: &Task) -> f64 {
    left.id.abs_diff(right.id) as f64
}

pub(super) fn task_priority(_plan: &Plan, task: &Task) -> i64 {
    -(task.id as i64)
}

pub(super) fn worker_priority(_plan: &Plan, task: &Task, worker: usize) -> i64 {
    task.id.abs_diff(worker) as i64
}

pub type WorkTask = Task;