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using System;
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using System.Collections;
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using System.Collections.Generic;
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namespace NullLib.Iterator
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{
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    public static class NIterator
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    {
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        public static IEnumerable Concat(this IEnumerable iterator1, IEnumerable iterator2)
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        {
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            foreach (var i in iterator1)
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                yield return i;
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            foreach (var i in iterator2)
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                yield return i;
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        }
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        public static IEnumerable<T> Concat<T>(this IEnumerable<T> iterator1, IEnumerable<T> iterator2)
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        {
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            foreach (var i in iterator1)
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                yield return i;
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            foreach (var i in iterator2)
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                yield return i;
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        }
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        public static IEnumerable Concat(this IEnumerable iterator1, params IEnumerable[] iterator2)
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        {
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            foreach (var i in iterator1)
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                yield return i;
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            foreach (var i in iterator2)
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                foreach (var j in i)
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                    yield return j;
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        }
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        public static IEnumerable<T> Concat<T>(this IEnumerable<T> iterator1, params IEnumerable<T>[] iterator2)
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        {
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            foreach (var i in iterator1)
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                yield return i;
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            foreach (var i in iterator2)
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                foreach (var j in i)
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                    yield return j;
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        }
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        public static IEnumerable Concat(params IEnumerable[] iterators)
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        {
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            foreach (var i in iterators)
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                foreach (var j in i)
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                    yield return j;
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        }
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        public static IEnumerable<T> Concat<T>(params IEnumerable<T>[] iterators)
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        {
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            foreach (var i in iterators)
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                foreach (var j in i)
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                    yield return j;
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        }
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    }
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}