HashCodeExtensions.cs

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using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
 
namespace IKVM.CoreLib.System
{
 
    internal static class HashCodeExtensions
    {
 
        public static void AddRange<T>(this ref HashCode self, IEnumerable<T>? items)
        {
            if (items is null)
            {
                self.Add(0);
            }
            else
            {
                self.Add(1);
                foreach (var i in items)
                    self.Add(i);
            }
        }
 
        public static void AddRange<T>(this ref HashCode self, T[]? items)
        {
            if (items is null)
            {
                self.Add(0);
            }
            else
            {
                self.Add(1);
                foreach (var i in items)
                    self.Add(i);
            }
        }
 
        public static void AddRange<T>(this ref HashCode self, ImmutableArray<T> items)
        {
            if (items.IsDefault)
            {
                self.Add(0);
            }
            else
            {
                self.Add(1);
                foreach (var i in items)
                    self.Add(i);
            }
        }
 
        public static void AddRange<T>(this ref HashCode self, ImmutableHashSet<T> items, IComparer<T> comparer)
        {
            if (comparer is null)
                throw new ArgumentNullException(nameof(comparer));
 
            if (items is null)
            {
                self.Add(0);
            }
            else
            {
                var l = items.ToArray();
                Array.Sort(l, comparer);
 
                self.Add(1);
                foreach (var i in items)
                    self.Add(i);
            }
        }
 
        public static void AddRange<T>(this ref HashCode self, ImmutableHashSet<T> items)
        {
            AddRange(ref self, items, Comparer<T>.Default);
        }
 
        public static void AddRange<T>(this ref HashCode self, ISet<T> items, IComparer<T> comparer)
        {
            if (comparer is null)
                throw new ArgumentNullException(nameof(comparer));
 
            if (items is null)
            {
                self.Add(0);
            }
            else
            {
                var l = items.ToArray();
                Array.Sort(l, comparer);
 
                self.Add(1);
                foreach (var i in items)
                    self.Add(i);
            }
        }
 
        public static void AddRange<T>(this ref HashCode self, ISet<T> items)
        {
            AddRange(ref self, items, Comparer<T>.Default);
        }
 
    }
 
}