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namespace Medallion.Threading.Internal;

/// <summary>

/// Wraps a value tuple to be a read/write reference

/// </summary>

#if DEBUG

public

#else

internal

#endif

sealed class RefBox<T> where T : struct

{

private readonly T _value;

internal RefBox(T value)

{

this._value = value;

}

public ref readonly T Value => ref this._value;

}

/// <summary>

/// Simplifies storing state in certain <see cref="IDisposable"/>s.

/// </summary>

#if DEBUG

public

#else

internal

#endif

sealed class RefBox

{

public static RefBox<T> Create<T>(T value) where T : struct => new RefBox<T>(value);

/// <summary>

/// Thread-safely checks if <paramref name="boxRef"/> is non-null and if so sets it to null and outputs

/// the value as <paramref name="value"/>.

/// </summary>

public static bool TryConsume<T>(ref RefBox<T>? boxRef, out T value)

where T : struct

{

var box = Interlocked.Exchange(ref boxRef, null);

if (box != null)

{

value = box.Value;

return true;

}

value = default;

return false;

}

}