using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization;

namespace System
{
	[Serializable]
	public readonly struct RuntimeFieldHandle : ISerializable
	{
		readonly IntPtr value;

		internal RuntimeFieldHandle (IntPtr v)
		{
			value = v;
		}

		RuntimeFieldHandle (SerializationInfo info, StreamingContext context)
		{
			throw new PlatformNotSupportedException ();
		}

		public void GetObjectData (SerializationInfo info, StreamingContext context)
		{
			throw new PlatformNotSupportedException ();
		}

		public IntPtr Value {
			get {
				return value;
			}
		}

		internal bool IsNullHandle ()
		{
			return value == IntPtr.Zero;
		}

		public override bool Equals (object? obj)
		{
			if (obj == null || GetType () != obj.GetType ())
				return false;

			return value == ((RuntimeFieldHandle)obj).Value;
		}

		public bool Equals (RuntimeFieldHandle handle)
		{
			return value == handle.Value;
		}

		public override int GetHashCode ()
		{
			return value.GetHashCode ();
		}

		public static bool operator == (RuntimeFieldHandle left, RuntimeFieldHandle right)
		{
			return left.Equals (right);
		}

		public static bool operator != (RuntimeFieldHandle left, RuntimeFieldHandle right)
		{
			return !left.Equals (right);
		}

		[MethodImplAttribute(MethodImplOptions.InternalCall)]
		static extern void SetValueInternal (FieldInfo fi, object obj, object value);

		internal static void SetValue (RuntimeFieldInfo field, Object obj, Object value, RuntimeType fieldType, FieldAttributes fieldAttr, RuntimeType declaringType, ref bool domainInitialized)
		{
			SetValueInternal (field, obj, value);
		}

		[MethodImplAttribute(MethodImplOptions.InternalCall)]
		static unsafe extern internal Object GetValueDirect (RuntimeFieldInfo field, RuntimeType fieldType, void *pTypedRef, RuntimeType contextType);

		[MethodImplAttribute(MethodImplOptions.InternalCall)]
		static unsafe extern internal void SetValueDirect (RuntimeFieldInfo field, RuntimeType fieldType, void* pTypedRef, Object value, RuntimeType contextType);
	}

}