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+<?php
+
+/**
+ * This file was originally part of brick/math
+ *
+ * Copyright (c) 2013-present Benjamin Morel
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * @link https://github.com/brick/math brick/math at GitHub
+ */
+
+declare(strict_types=1);
+
+namespace Ramsey\Uuid\Math;
+
+/**
+ * Specifies a rounding behavior for numerical operations capable of discarding
+ * precision.
+ *
+ * Each rounding mode indicates how the least significant returned digit of a
+ * rounded result is to be calculated. If fewer digits are returned than the
+ * digits needed to represent the exact numerical result, the discarded digits
+ * will be referred to as the discarded fraction regardless the digits'
+ * contribution to the value of the number. In other words, considered as a
+ * numerical value, the discarded fraction could have an absolute value greater
+ * than one.
+ */
+final class RoundingMode
+{
+    /**
+     * Private constructor. This class is not instantiable.
+     *
+     * @codeCoverageIgnore
+     */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Asserts that the requested operation has an exact result, hence no
+     * rounding is necessary.
+     */
+    public const UNNECESSARY = 0;
+
+    /**
+     * Rounds away from zero.
+     *
+     * Always increments the digit prior to a nonzero discarded fraction.
+     * Note that this rounding mode never decreases the magnitude of the
+     * calculated value.
+     */
+    public const UP = 1;
+
+    /**
+     * Rounds towards zero.
+     *
+     * Never increments the digit prior to a discarded fraction (i.e.,
+     * truncates). Note that this rounding mode never increases the magnitude of
+     * the calculated value.
+     */
+    public const DOWN = 2;
+
+    /**
+     * Rounds towards positive infinity.
+     *
+     * If the result is positive, behaves as for UP; if negative, behaves as for
+     * DOWN. Note that this rounding mode never decreases the calculated value.
+     */
+    public const CEILING = 3;
+
+    /**
+     * Rounds towards negative infinity.
+     *
+     * If the result is positive, behave as for DOWN; if negative, behave as for
+     * UP. Note that this rounding mode never increases the calculated value.
+     */
+    public const FLOOR = 4;
+
+    /**
+     * Rounds towards "nearest neighbor" unless both neighbors are equidistant,
+     * in which case round up.
+     *
+     * Behaves as for UP if the discarded fraction is >= 0.5; otherwise, behaves
+     * as for DOWN. Note that this is the rounding mode commonly taught at
+     * school.
+     */
+    public const HALF_UP = 5;
+
+    /**
+     * Rounds towards "nearest neighbor" unless both neighbors are equidistant,
+     * in which case round down.
+     *
+     * Behaves as for UP if the discarded fraction is > 0.5; otherwise, behaves
+     * as for DOWN.
+     */
+    public const HALF_DOWN = 6;
+
+    /**
+     * Rounds towards "nearest neighbor" unless both neighbors are equidistant,
+     * in which case round towards positive infinity.
+     *
+     * If the result is positive, behaves as for HALF_UP; if negative, behaves
+     * as for HALF_DOWN.
+     */
+    public const HALF_CEILING = 7;
+
+    /**
+     * Rounds towards "nearest neighbor" unless both neighbors are equidistant,
+     * in which case round towards negative infinity.
+     *
+     * If the result is positive, behaves as for HALF_DOWN; if negative, behaves
+     * as for HALF_UP.
+     */
+    public const HALF_FLOOR = 8;
+
+    /**
+     * Rounds towards the "nearest neighbor" unless both neighbors are
+     * equidistant, in which case rounds towards the even neighbor.
+     *
+     * Behaves as for HALF_UP if the digit to the left of the discarded fraction
+     * is odd; behaves as for HALF_DOWN if it's even.
+     *
+     * Note that this is the rounding mode that statistically minimizes
+     * cumulative error when applied repeatedly over a sequence of calculations.
+     * It is sometimes known as "Banker's rounding", and is chiefly used in the
+     * USA.
+     */
+    public const HALF_EVEN = 9;
+}