Unsafe.AsRef implicit operator

RefImplicitCast.cs

using System.Runtime.CompilerServices;

var p = new Private();
Console.WriteLine(p.Value); // 0

Accessor r = p; // implicit cast で p の参照が r に渡る。
r.Value = 1;
Console.WriteLine(p.Value); // 書き変わってる。

// PrivateProxy 触りつつ、
// primary constructor 触りつつ遊んでて…
ref struct Accessor(ref Private x)
{
    ref Private _x = ref x;

    // もしや implicit cast 行けるのでは？ (誰得)
    public static implicit operator Accessor(in Private x) => new(ref Unsafe.AsRef(in x));

    [UnsafeAccessor(UnsafeAccessorKind.Field)]
    private static extern ref int _value(ref Private x);

    public ref int Value => ref _value(ref _x);
}

struct Private
{
    private int _value;
    public readonly int Value => _value;
}