wasSharp – Rev
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///////////////////////////////////////////////////////////////////////////
// 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;
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)));
}
}
}
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