Struct UnimprovedStepCountTermination 

pub struct UnimprovedStepCountTermination<S: PlanningSolution> { /* private fields */ }

Terminates if no improvement occurs for a specified number of steps.

This is useful to avoid spending too much time when the solver has plateaued and is unlikely to find better solutions.

Example

use solverforge_solver::termination::UnimprovedStepCountTermination;
use solverforge_core::score::SimpleScore;
use solverforge_core::domain::PlanningSolution;

#[derive(Clone)]
struct MySolution;
impl PlanningSolution for MySolution {
    type Score = SimpleScore;
    fn score(&self) -> Option<Self::Score> { None }
    fn set_score(&mut self, _: Option<Self::Score>) {}
}

// Terminate after 100 steps without improvement
let term = UnimprovedStepCountTermination::<MySolution>::new(100);

Implementations

impl<S: PlanningSolution> UnimprovedStepCountTermination<S>

pub fn new(limit: u64) -> Self

Creates a termination that stops after limit steps without improvement.

Trait Implementations

impl<S: PlanningSolution> Debug for UnimprovedStepCountTermination<S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<S: PlanningSolution> Termination<S> for UnimprovedStepCountTermination<S>

fn is_terminated(&self, solver_scope: &SolverScope<S>) -> bool

Returns true if solving should terminate.

impl<S: PlanningSolution> Send for UnimprovedStepCountTermination<S>