52 lines
2.1 KiB
C#
52 lines
2.1 KiB
C#
// Copyright (c) Xenko contributors (https://xenko.com) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
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// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
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/* MIT License
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Copyright (c) 2016 JetBrains http://www.jetbrains.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE. */
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using System;
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namespace att
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{
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/// <summary>
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/// Indicates that the value of the marked element could be <c>null</c> sometimes, so the check for <c>null</c>
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/// is necessary before its usage.
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/// </summary>
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/// <example>
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/// <code>
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/// [CanBeNull] object Test() => null;
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///
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/// void UseTest() {
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/// var p = Test();
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/// var s = p.ToString(); // Warning: Possible 'System.NullReferenceException'
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/// }
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/// </code>
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/// </example>
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[AttributeUsage(
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AttributeTargets.Method | AttributeTargets.Parameter | AttributeTargets.Property |
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AttributeTargets.Delegate | AttributeTargets.Field | AttributeTargets.Event |
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AttributeTargets.Class | AttributeTargets.Interface | AttributeTargets.GenericParameter )]
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public sealed class CanBeNullAttribute: Attribute
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{
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}
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}
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