PartitionExtensions.cs

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// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.
 
using System;
using System.Collections.Generic;
 
namespace CommandLine.Core
{
    internal static class PartitionExtensions
    {
        public static Tuple<IEnumerable<T>, IEnumerable<T>> PartitionByPredicate<T>(this IEnumerable<T> items,
            Func<T, bool> pred)
        {
            List<T> yes = new List<T>();
            List<T> no = new List<T>();
 
            foreach (T item in items)
            {
                List<T> list = pred(item) ? yes : no;
                list.Add(item);
            }
 
            return Tuple.Create<IEnumerable<T>, IEnumerable<T>>(yes, no);
        }
    }
}