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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.Collections.Immutable;
using System.Diagnostics;
using System.Threading;
namespace Microsoft.CodeAnalysis.CSharp.Symbols.PublicModel
{
internal sealed class PointerTypeSymbol : TypeSymbol, IPointerTypeSymbol
{
private readonly Symbols.PointerTypeSymbol _underlying;
private ITypeSymbol? _lazyPointedAtType;
public PointerTypeSymbol(Symbols.PointerTypeSymbol underlying, CodeAnalysis.NullableAnnotation nullableAnnotation)
: base(nullableAnnotation)
{
Debug.Assert(underlying is object);
_underlying = underlying;
}
protected override ITypeSymbol WithNullableAnnotation(CodeAnalysis.NullableAnnotation nullableAnnotation)
{
Debug.Assert(nullableAnnotation != _underlying.DefaultNullableAnnotation);
Debug.Assert(nullableAnnotation != this.NullableAnnotation);
return new PointerTypeSymbol(_underlying, nullableAnnotation);
}
internal override CSharp.Symbol UnderlyingSymbol => _underlying;
internal override Symbols.NamespaceOrTypeSymbol UnderlyingNamespaceOrTypeSymbol => _underlying;
internal override Symbols.TypeSymbol UnderlyingTypeSymbol => _underlying;
ITypeSymbol IPointerTypeSymbol.PointedAtType
{
get
{
if (_lazyPointedAtType is null)
{
Interlocked.CompareExchange(ref _lazyPointedAtType, _underlying.PointedAtTypeWithAnnotations.GetPublicSymbol(), null);
}
return _lazyPointedAtType;
}
}
ImmutableArray<CustomModifier> IPointerTypeSymbol.CustomModifiers
{
get { return _underlying.PointedAtTypeWithAnnotations.CustomModifiers; }
}
#region ISymbol Members
protected override void Accept(SymbolVisitor visitor)
{
visitor.VisitPointerType(this);
}
protected override TResult? Accept<TResult>(SymbolVisitor<TResult> visitor)
where TResult : default
{
return visitor.VisitPointerType(this);
}
protected override TResult Accept<TArgument, TResult>(SymbolVisitor<TArgument, TResult> visitor, TArgument argument)
{
return visitor.VisitPointerType(this, argument);
}
#endregion
}
}
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