1 files changed, 68 insertions, 0 deletions
diff --git a/mono/DBusType/Nil.cs b/mono/DBusType/Nil.cs
new file mode 100644
index 00000000..e39b64a9
--- /dev/null
+++ b/mono/DBusType/Nil.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Reflection.Emit;
+
+using DBus;
+
+namespace DBus.DBusType
+{
+  /// <summary>
+  /// Marks a "void"/"unset"/"nonexistent"/"null" argument.
+  /// </summary>
+  public class Nil : IDBusType
+  {
+    public const char Code = 'v';
+    
+    private Nil()
+    {
+    }
+    
+    public Nil(object nil) 
+    {
+    }
+
+    public Nil(IntPtr iter)
+    {
+    }
+    
+    public void Append(IntPtr iter)
+    {
+      if (!dbus_message_iter_append_nil(iter))
+	throw new ApplicationException("Failed to append NIL argument");
+    }
+
+    public static bool Suits(System.Type type) 
+    {
+      return false;
+    }
+
+    public static void EmitMarshalIn(ILGenerator generator, Type type)
+    {
+      if (type.IsByRef) {
+	generator.Emit(OpCodes.Ldind_I1);
+      }
+    }
+
+    public static void EmitMarshalOut(ILGenerator generator, Type type, bool isReturn) 
+    {
+      generator.Emit(OpCodes.Unbox, type);
+      generator.Emit(OpCodes.Ldind_I1);
+      if (!isReturn) {
+	generator.Emit(OpCodes.Stind_I1);
+      }
+    }
+    
+    public object Get() 
+    {
+      return null;
+    }
+
+    public object Get(System.Type type)
+    {
+      throw new ArgumentException("Cannot cast DBus.Type.Nil to type '" + type.ToString() + "'");
+    }
+
+    [DllImport("dbus-1")]
+    private extern static bool dbus_message_iter_append_nil(IntPtr iter);
+  }
+}