//// <auto-generated/>
//#pragma warning disable
//#nullable enable annotations
//
//// Licensed to the .NET Foundation under one or more agreements.
//// The .NET Foundation licenses this file to you under the MIT license.
//
//namespace System
//{
//    /// <summary>Represent a type can be used to index a collection either from the start or the end.</summary>
//    /// <remarks>
//    /// Index is used by the C# compiler to support the new index syntax
//    /// <code>
//    /// int[] someArray = new int[5] { 1, 2, 3, 4, 5 } ;
//    /// int lastElement = someArray[^1]; // lastElement = 5
//    /// </code>
//    /// </remarks>
//    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
//    public readonly struct Index : global::System.IEquatable<global::System.Index>
//    {
//        private readonly int _value;
//
//        /// <summary>Construct an Index using a value and indicating if the index is from the start or from the end.</summary>
//        /// <param name="value">The index value. it has to be zero or positive number.</param>
//        /// <param name="fromEnd">Indicating if the index is from the start or from the end.</param>
//        /// <remarks>
//        /// If the Index constructed from the end, index value 1 means pointing at the last element and index value 0 means pointing at beyond last element.
//        /// </remarks>
//        [global::System.Runtime.CompilerServices.MethodImpl(global::System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
//        public Index(int value, bool fromEnd = false)
//        {
//            if (value < 0)
//            {
//                global::System.Index.ThrowHelper.ThrowValueArgumentOutOfRange_NeedNonNegNumException();
//            }
//
//            if (fromEnd)
//                _value = ~value;
//            else
//                _value = value;
//        }
//
//        // The following private constructors mainly created for perf reason to avoid the checks
//        private Index(int value)
//        {
//            _value = value;
//        }
//
//        /// <summary>Create an Index pointing at first element.</summary>
//        public static global::System.Index Start => new global::System.Index(0);
//
//        /// <summary>Create an Index pointing at beyond last element.</summary>
//        public static global::System.Index End => new global::System.Index(~0);
//
//        /// <summary>Create an Index from the start at the position indicated by the value.</summary>
//        /// <param name="value">The index value from the start.</param>
//        [global::System.Runtime.CompilerServices.MethodImpl(global::System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
//        public static global::System.Index FromStart(int value)
//        {
//            if (value < 0)
//            {
//                global::System.Index.ThrowHelper.ThrowValueArgumentOutOfRange_NeedNonNegNumException();
//            }
//
//            return new global::System.Index(value);
//        }
//
//        /// <summary>Create an Index from the end at the position indicated by the value.</summary>
//        /// <param name="value">The index value from the end.</param>
//        [global::System.Runtime.CompilerServices.MethodImpl(global::System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
//        public static global::System.Index FromEnd(int value)
//        {
//            if (value < 0)
//            {
//                global::System.Index.ThrowHelper.ThrowValueArgumentOutOfRange_NeedNonNegNumException();
//            }
//
//            return new global::System.Index(~value);
//        }
//
//        /// <summary>Returns the index value.</summary>
//        public int Value
//        {
//            get
//            {
//                if (_value < 0)
//                    return ~_value;
//                else
//                    return _value;
//            }
//        }
//
//        /// <summary>Indicates whether the index is from the start or the end.</summary>
//        public bool IsFromEnd => _value < 0;
//
//        /// <summary>Calculate the offset from the start using the giving collection length.</summary>
//        /// <param name="length">The length of the collection that the Index will be used with. length has to be a positive value</param>
//        /// <remarks>
//        /// For performance reason, we don't validate the input length parameter and the returned offset value against negative values.
//        /// we don't validate either the returned offset is greater than the input length.
//        /// It is expected Index will be used with collections which always have non negative length/count. If the returned offset is negative and
//        /// then used to index a collection will get out of range exception which will be same affect as the validation.
//        /// </remarks>
//        [global::System.Runtime.CompilerServices.MethodImpl(global::System.Runtime.CompilerServices.MethodImplOptions.AggressiveInlining)]
//        public int GetOffset(int length)
//        {
//            int offset = _value;
//            if (IsFromEnd)
//            {
//                // offset = length - (~value)
//                // offset = length + (~(~value) + 1)
//                // offset = length + value + 1
//
//                offset += length + 1;
//            }
//            return offset;
//        }
//
//        /// <summary>Indicates whether the current Index object is equal to another object of the same type.</summary>
//        /// <param name="value">An object to compare with this object</param>
//        public override bool Equals([global::System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? value) => value is global::System.Index && _value == ((global::System.Index)value)._value;
//
//        /// <summary>Indicates whether the current Index object is equal to another Index object.</summary>
//        /// <param name="other">An object to compare with this object</param>
//        public bool Equals(global::System.Index other) => _value == other._value;
//
//        /// <summary>Returns the hash code for this instance.</summary>
//        public override int GetHashCode() => _value;
//
//        /// <summary>Converts integer number to an Index.</summary>
//        public static implicit operator global::System.Index(int value) => FromStart(value);
//
//        /// <summary>Converts the value of the current Index object to its equivalent string representation.</summary>
//        public override string ToString()
//        {
//            if (IsFromEnd)
//                return ToStringFromEnd();
//
//            return ((uint)Value).ToString();
//        }
//
//        private string ToStringFromEnd()
//        {
//            return '^' + Value.ToString();
//        }
//
//        private static class ThrowHelper
//        {
//            [global::System.Diagnostics.CodeAnalysis.DoesNotReturn]
//            public static void ThrowValueArgumentOutOfRange_NeedNonNegNumException()
//            {
//                throw new global::System.ArgumentOutOfRangeException("value", "Non-negative number required.");
//            }
//        }
//    }
//}