wasSharp – Blame information for rev 11
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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 | } |