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StrongBox.cs

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StrongBox.cs

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using System.Diagnostics.CodeAnalysis;
namespace Npgsql.Util;
abstract class StrongBox
{
private protected StrongBox() { }
public abstract bool HasValue { get; }
public abstract object? Value { get; set; }
public abstract void Clear();
}
sealed class StrongBox<T> : StrongBox
{
bool _hasValue;
[MaybeNull] T _typedValue;
[MaybeNull]
public T TypedValue {
get => _typedValue;
set
{
_hasValue = true;
_typedValue = value;
}
}
public override bool HasValue => _hasValue;
public override object? Value
{
get => TypedValue;
set => TypedValue = (T)value!;
}
public override void Clear()
{
_hasValue = false;
TypedValue = default!;
}
}
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