BishBosh.State.InstancesByPosition

AUTHOR

Dr. Alistair Ward

DESCRIPTION

Records the number of times each position has been encountered.

Types

Type-synonyms

Constants

leastCyclicPlies :: NMoves

The smallast number of repeatable plies required to form a cycle.

Data-types

data InstancesByPosition position

• A count of the number of instances of positions which have occurred.
• Greater than '1' represents a repetition.

Instances

Eq position => Eq (InstancesByPosition position)

Methods

(==) :: InstancesByPosition position -> InstancesByPosition position -> Bool

(/=) :: InstancesByPosition position -> InstancesByPosition position -> Bool

NFData position => NFData (InstancesByPosition position)

Methods

rnf :: InstancesByPosition position -> ()

(Ord position, ReflectableOnX position) => ReflectableOnX (InstancesByPosition position)

Methods

reflectOnX :: InstancesByPosition position -> InstancesByPosition position

Functions

countConsecutiveRepeatablePlies :: InstancesByPosition position -> NMoves

Count the total number of consecutive repeatable plies amongst recent moves.

countPositionRepetitions :: InstancesByPosition position -> NBoards

Count the total number of repetitions of positions.

getNDistinctPositions :: InstancesByPosition position -> NBoards

The number of distinct positions.

Constructors

mkInstancesByPosition :: NBoardsByPosition position -> InstancesByPosition position

Smart constructor.

mkSingleton :: position -> InstancesByPosition position

Constructor.

Mutators

insertPosition

Arguments

:: Ord position

=> Bool

Whether the turn which led to the specified position, was repeatable.

-> position

-> Transformation position

Insert a position into the collection.

deletePosition :: Ord position => position -> Transformation position

Remove a position from the collection, as required to implement rollback.

Predicates

anyInstancesByPosition :: (NBoards -> Bool) -> InstancesByPosition position -> Bool

Predicate: apply the specified predicate to the map.