40 lines
795 B
Swift
40 lines
795 B
Swift
//
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// TicTacToeBoard.swift
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// TTTKit
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//
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// Created by Shadowfacts on 12/21/22.
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//
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import Foundation
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public struct TicTacToeBoard: Board {
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private var marks: [[Mark?]] = [
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[nil, nil, nil],
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[nil, nil, nil],
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[nil, nil, nil],
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]
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init() {
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}
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init(marks: [[Mark?]]) {
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precondition(marks.count == 3)
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precondition(marks.allSatisfy { $0.count == 3 })
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self.marks = marks
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}
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public subscript(_ column: Int, _ row: Int) -> Mark? {
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get {
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marks[row][column]
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}
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}
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public func canPlay(column: Int, row: Int) -> Bool {
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return self[column, row] == nil
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}
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public mutating func play(mark: Mark, column: Int, row: Int) {
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marks[row][column] = mark
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}
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}
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