wasSharp – Blame information for rev 11
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| Rev | Author | Line No. | Line |
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| 11 | office | 1 | /////////////////////////////////////////////////////////////////////////// |
| 2 | // Copyright (C) Wizardry and Steamworks 2013 - License: GNU GPLv3 // |
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| 3 | // Please see: http://www.gnu.org/licenses/gpl.html for legal details, // |
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| 4 | // rights of fair usage, the disclaimer and warranty conditions. // |
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| 5 | /////////////////////////////////////////////////////////////////////////// |
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| 6 | |||
| 7 | using System; |
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| 8 | using System.Collections.Generic; |
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| 9 | using System.Linq; |
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| 10 | using System.Text; |
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| 11 | using System.Threading.Tasks; |
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| 12 | |||
| 13 | namespace wasSharp.Linq |
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| 14 | { |
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| 15 | public static class Extensions |
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| 16 | { |
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| 17 | /////////////////////////////////////////////////////////////////////////// |
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| 18 | // Copyright (C) 2016 Wizardry and Steamworks - License: GNU GPLv3 // |
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| 19 | /////////////////////////////////////////////////////////////////////////// |
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| 20 | /// <summary> |
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| 21 | /// Returns true of an enumerable contains more than one element. |
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| 22 | /// </summary> |
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| 23 | /// <typeparam name="T">the type of the enumeration</typeparam> |
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| 24 | /// <param name="e">the enumeration</param> |
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| 25 | /// <returns>true if enumeration contains more than one element</returns> |
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| 26 | /// <remarks>O(2) worst case</remarks> |
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| 27 | public static bool Some<T>(this IEnumerable<T> e) |
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| 28 | { |
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| 29 | var i = 0; |
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| 30 | using (var iter = e.GetEnumerator()) |
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| 31 | { |
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| 32 | while (iter.MoveNext()) |
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| 33 | { |
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| 34 | if (++i > 1) |
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| 35 | return true; |
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| 36 | } |
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| 37 | return false; |
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| 38 | } |
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| 39 | } |
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| 40 | |||
| 41 | /// <summary> |
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| 42 | /// Sequentially removes all the elements from the first sequence that are in the second sequence. |
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| 43 | /// </summary> |
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| 44 | /// <typeparam name="T">the type o the collection</typeparam> |
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| 45 | /// <param name="o">the first sequence to remove from</param> |
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| 46 | /// <param name="p">the second sequence to remove</param> |
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| 47 | /// <returns>the first sequence excluding the second sequence</returns> |
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| 48 | public static IEnumerable<T> SequenceExcept<T>(this IEnumerable<T> o, IEnumerable<T> p) where T : IEquatable<T> |
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| 49 | { |
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| 50 | var l = new List<T>(o); |
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| 51 | var r = new List<T>(p); |
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| 52 | return l.Count > r.Count |
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| 53 | ? l.Zip(r, (x, y) => x.Equals(y) ? default(T) : y) |
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| 54 | .Concat(l.Skip(r.Count())) |
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| 55 | .Where(q => q != null && !q.Equals(default(T))) |
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| 56 | : r.Zip(l, (x, y) => x.Equals(y) ? default(T) : y) |
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| 57 | .Concat(r.Skip(l.Count())) |
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| 58 | .Where(q => q != null && !q.Equals(default(T))); |
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| 59 | } |
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| 60 | } |
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| 61 | } |