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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
using Roslyn.Utilities;
namespace Microsoft.CodeAnalysis
{
[DebuggerDisplay("{GetDebuggerDisplay(), nq}")]
public readonly struct NullabilityInfo : IEquatable<NullabilityInfo>
{
/// <summary>
/// The nullable annotation of the expression represented by the syntax node. This represents
/// the nullability of expressions that can be assigned to this expression, if this expression
/// can be used as an lvalue.
/// </summary>
public NullableAnnotation Annotation { get; }
/// <summary>
/// The nullable flow state of the expression represented by the syntax node. This represents
/// the compiler's understanding of whether this expression can currently contain null, if
/// this expression can be used as an rvalue.
/// </summary>
public NullableFlowState FlowState { get; }
internal NullabilityInfo(NullableAnnotation annotation, NullableFlowState flowState)
{
Annotation = annotation;
FlowState = flowState;
}
private string GetDebuggerDisplay() => $"{{Annotation: {Annotation}, Flow State: {FlowState}}}";
public override bool Equals(object? other) =>
other is NullabilityInfo info && Equals(info);
public override int GetHashCode() =>
Hash.Combine(((int)Annotation).GetHashCode(), ((int)FlowState).GetHashCode());
public bool Equals(NullabilityInfo other) =>
Annotation == other.Annotation &&
FlowState == other.FlowState;
}
}
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