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#if !NETSTANDARD2_1
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using System;
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/*https://github.com/i3arnon/ConcurrentHashSet*/
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namespace ZeroLevel.Models
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{
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namespace System.Diagnostics.CodeAnalysis
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{
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/// <summary>Specifies that when a method returns <see cref="ReturnValue"/>, the parameter may be null even if the corresponding type disallows it.</summary>
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[AttributeUsage(AttributeTargets.Parameter)]
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internal sealed class MaybeNullWhenAttribute : Attribute
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{
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/// <summary>Initializes the attribute with the specified return value condition.</summary>
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/// <param name="returnValue">
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/// The return value condition. If the method returns this value, the associated parameter may be null.
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/// </param>
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public MaybeNullWhenAttribute(bool returnValue) => ReturnValue = returnValue;
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/// <summary>Gets the return value condition.</summary>
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public bool ReturnValue { get; }
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}
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}
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}
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#endif
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