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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2013. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+
+#ifndef __ERL_MAP_H__
+#define __ERL_MAP_H__
+
+#include "sys.h"
+/* MAP */
+
+typedef struct map_s {
+ Eterm thing_word;
+ Uint size;
+ Eterm keys; /* tuple */
+} map_t;
+/* map node
+ *
+ * -----------
+ * Eterm THING
+ * Eterm Keys -> {K1, K2, K3, ..., Kn} where n = arity
+ * ----
+ * Eterm V1
+ * ...
+ * Eterm Vn, where n = arity
+ * -----------
+ */
+
+
+
+/* erl_term.h stuff */
+#define make_map(x) make_boxed((Eterm*)(x))
+#define make_map_rel(x, BASE) make_boxed_rel((Eterm*)(x),(BASE))
+#define is_map(x) (is_boxed((x)) && is_map_header(*boxed_val((x))))
+#define is_map_rel(RTERM,BASE) is_map(rterm2wterm(RTERM,BASE))
+#define is_not_map(x) (!is_map((x)))
+#define is_map_header(x) (((x) & (_TAG_HEADER_MASK)) == _TAG_HEADER_MAP)
+#define header_is_map(x) ((((x) & (_HEADER_SUBTAG_MASK)) == MAP_SUBTAG))
+#define map_val(x) (_unchecked_boxed_val((x)))
+#define map_val_rel(RTERM, BASE) map_val(rterm2wterm(RTERM, BASE))
+
+#define map_get_values(x) (((Eterm *)(x)) + 3)
+#define map_get_keys(x) (((Eterm *)tuple_val(((map_t *)(x))->keys)) + 1)
+#define map_get_size(x) (((map_t*)(x))->size)
+
+#define MAP_HEADER _make_header(1,_TAG_HEADER_MAP)
+
+#endif
+