wehub-resource-sync
78 lines
2.6 KiB
C#
78 lines
2.6 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// Provides convenience of linq extension methods for <see cref="IEnumerator{T}"/> types
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/// </summary>
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public static class EnumeratorExtensions
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{
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/// <summary>
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/// Filter the enumerator using the specified predicate
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/// </summary>
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public static IEnumerator<T> Where<T>(this IEnumerator<T> enumerator, Func<T, bool> predicate)
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{
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using (enumerator)
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{
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while (enumerator.MoveNext())
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{
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if (predicate(enumerator.Current))
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{
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yield return enumerator.Current;
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}
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}
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}
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}
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/// <summary>
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/// Project the enumerator using the specified selector
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/// </summary>
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public static IEnumerator<TResult> Select<T, TResult>(this IEnumerator<T> enumerator, Func<T, TResult> selector)
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{
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using (enumerator)
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{
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while (enumerator.MoveNext())
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{
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yield return selector(enumerator.Current);
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}
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}
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}
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/// <summary>
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/// Project the enumerator using the specified selector
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/// </summary>
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public static IEnumerator<TResult> SelectMany<T, TResult>(this IEnumerator<T> enumerator, Func<T, IEnumerator<TResult>> selector)
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{
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using (enumerator)
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{
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while (enumerator.MoveNext())
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{
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using (var inner = selector(enumerator.Current))
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{
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while (inner.MoveNext())
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{
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yield return inner.Current;
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}
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}
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}
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}
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}
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}
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}
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