| /Linq.cs |
|---|
| @@ -0,0 +1,61 @@ |
|---|
| /////////////////////////////////////////////////////////////////////////// |
| // Copyright (C) Wizardry and Steamworks 2013 - License: GNU GPLv3 // |
| // Please see: http://www.gnu.org/licenses/gpl.html for legal details, // |
| // rights of fair usage, the disclaimer and warranty conditions. // |
| /////////////////////////////////////////////////////////////////////////// |
| |
| using System; |
| using System.Collections.Generic; |
| using System.Linq; |
| using System.Text; |
| using System.Threading.Tasks; |
| |
| namespace wasSharp.Linq |
| { |
| public static class Extensions |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Copyright (C) 2016 Wizardry and Steamworks - License: GNU GPLv3 // |
| /////////////////////////////////////////////////////////////////////////// |
| /// <summary> |
| /// Returns true of an enumerable contains more than one element. |
| /// </summary> |
| /// <typeparam name="T">the type of the enumeration</typeparam> |
| /// <param name="e">the enumeration</param> |
| /// <returns>true if enumeration contains more than one element</returns> |
| /// <remarks>O(2) worst case</remarks> |
| public static bool Some<T>(this IEnumerable<T> e) |
| { |
| var i = 0; |
| using (var iter = e.GetEnumerator()) |
| { |
| while (iter.MoveNext()) |
| { |
| if (++i > 1) |
| return true; |
| } |
| return false; |
| } |
| } |
| |
| /// <summary> |
| /// Sequentially removes all the elements from the first sequence that are in the second sequence. |
| /// </summary> |
| /// <typeparam name="T">the type o the collection</typeparam> |
| /// <param name="o">the first sequence to remove from</param> |
| /// <param name="p">the second sequence to remove</param> |
| /// <returns>the first sequence excluding the second sequence</returns> |
| public static IEnumerable<T> SequenceExcept<T>(this IEnumerable<T> o, IEnumerable<T> p) where T : IEquatable<T> |
| { |
| var l = new List<T>(o); |
| var r = new List<T>(p); |
| return l.Count > r.Count |
| ? l.Zip(r, (x, y) => x.Equals(y) ? default(T) : y) |
| .Concat(l.Skip(r.Count())) |
| .Where(q => q != null && !q.Equals(default(T))) |
| : r.Zip(l, (x, y) => x.Equals(y) ? default(T) : y) |
| .Concat(r.Skip(l.Count())) |
| .Where(q => q != null && !q.Equals(default(T))); |
| } |
| } |
| } |
