Viyi.Util/(netstandard2.0)/System/NullableAttributes.cs

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// https://github.com/dotnet/runtime/blob/main/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/NullableAttributes.cs

#pragma warning disable
#define INTERNAL_NULLABLE_ATTRIBUTES

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace System.Diagnostics.CodeAnalysis;

#if NETSTANDARD2_0 ||  NETCOREAPP2_0 ||  NETCOREAPP2_1 ||  NETCOREAPP2_2 || NET45 || NET451 || NET452 || NET46 || NET461 || NET462 || NET47 || NET471 || NET472 || NET48
/// <summary>Specifies that null is allowed as an input even if the corresponding type disallows it.</summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property, Inherited = false)]
#if SYSTEM_PRIVATE_CORELIB
public
#else
internal
#endif
    sealed class AllowNullAttribute : Attribute { }

/// <summary>Specifies that null is disallowed as an input even if the corresponding type allows it.</summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property, Inherited = false)]
#if SYSTEM_PRIVATE_CORELIB
public
#else
internal
#endif
    sealed class DisallowNullAttribute : Attribute { }

/// <summary>Specifies that an output may be null even if the corresponding type disallows it.</summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited = false)]
#if SYSTEM_PRIVATE_CORELIB
public
#else
internal
#endif
    sealed class MaybeNullAttribute : Attribute { }

/// <summary>Specifies that an output will not be null even if the corresponding type allows it. Specifies that an input argument was not null when the call returns.</summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, Inherited = false)]
#if SYSTEM_PRIVATE_CORELIB
public
#else
internal
#endif
    sealed class NotNullAttribute : Attribute { }

/// <summary>Specifies that when a method returns <see cref="ReturnValue"/>, the parameter may be null even if the corresponding type disallows it.</summary>
[AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
#if SYSTEM_PRIVATE_CORELIB
public
#else
internal
#endif
    sealed class MaybeNullWhenAttribute : Attribute {
    /// <summary>Initializes the attribute with the specified return value condition.</summary>
    /// <param name="returnValue">
    /// The return value condition. If the method returns this value, the associated parameter may be null.
    /// </param>
    public MaybeNullWhenAttribute(bool returnValue) => ReturnValue = returnValue;