+/*
+ This file is part of GNUnet
+ Copyright (C) 2013, 2014 GNUnet e.V.
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+ */
+
+/**
+ * @author Florian Dold
+ * @author Christian Grothoff
+ *
+ * @file
+ * Two-peer set operations
+ *
+ * @defgroup set Set service
+ * Two-peer set operations
+ *
+ * @see [Documentation](https://gnunet.org/set-subsystem)
+ *
+ * @{
+ */
+
+#ifndef GNUNET_SET_SERVICE_H
+#define GNUNET_SET_SERVICE_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0 /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+#include "gnunet_common.h"
+#include "gnunet_time_lib.h"
+#include "gnunet_configuration_lib.h"
+
+
+/**
+ * Maximum size of a context message for set operation requests.
+ */
+#define GNUNET_SET_CONTEXT_MESSAGE_MAX_SIZE ((1<<16) - 1024)
+
+
+/**
+ * Opaque handle to a set.
+ */
+struct GNUNET_SET_Handle;
+
+/**
+ * Opaque handle to a set operation request from another peer.
+ */
+struct GNUNET_SET_Request;
+
+/**
+ * Opaque handle to a listen operation.
+ */
+struct GNUNET_SET_ListenHandle;
+
+/**
+ * Opaque handle to a set operation.
+ */
+struct GNUNET_SET_OperationHandle;
+