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60 lines
2.6 KiB
60 lines
2.6 KiB
5 years ago
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#if NET20 || NET30 || NET35 || NET40 || !NET_4_6
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// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System.Collections.Generic;
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namespace System.Runtime.CompilerServices
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{
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/// <summary>
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/// Indicates that the use of <see cref="System.ValueTuple"/> on a member is meant to be treated as a tuple with element names.
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/// </summary>
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//[CLSCompliant(false)]
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[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue | AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Event)]
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public sealed class TupleElementNamesAttribute : Attribute
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{
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private readonly string[] _transformNames;
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/// <summary>
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/// Initializes a new instance of the <see cref="TupleElementNamesAttribute"/> class.
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/// </summary>
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/// <param name="transformNames">
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/// Specifies, in a pre-order depth-first traversal of a type's
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/// construction, which <see cref="ValueType"/> occurrences are
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/// meant to carry element names.
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/// </param>
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/// <remarks>
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/// This constructor is meant to be used on types that contain an
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/// instantiation of <see cref="ValueType"/> that contains
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/// element names. For instance, if <c>C</c> is a generic type with
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/// two type parameters, then a use of the constructed type <c>C{<see cref="System.ValueTuple{T1, T2}"/>, <see cref="System.ValueTuple{T1, T2, T3}"/></c> might be intended to
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/// treat the first type argument as a tuple with element names and the
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/// second as a tuple without element names. In which case, the
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/// appropriate attribute specification should use a
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/// <c>transformNames</c> value of <c>{ "name1", "name2", null, null,
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/// null }</c>.
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/// </remarks>
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public TupleElementNamesAttribute(string[] transformNames)
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{
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if (transformNames == null)
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{
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throw new ArgumentNullException("transformNames");
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}
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_transformNames = transformNames;
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}
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/// <summary>
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/// Specifies, in a pre-order depth-first traversal of a type's
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/// construction, which <see cref="System.ValueTuple"/> elements are
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/// meant to carry element names.
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/// </summary>
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public IList<string> TransformNames
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{
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get { return _transformNames; }
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}
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}
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}
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#endif
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