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+/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* ====================================================================
+ * Copyright (c) 1999-2007 Carnegie Mellon University.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * This work was supported in part by funding from the Defense Advanced 
+ * Research Projects Agency and the National Science Foundation of the 
+ * United States of America, and the CMU Sphinx Speech Consortium.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
+ * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
+ * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ====================================================================
+ *
+ */
+/**
+ * @file ngram_model_set.h Set of language models.
+ * @author David Huggins-Daines <dhuggins@cs.cmu.edu>
+ */
+
+#ifndef __NGRAM_MODEL_SET_H__
+#define __NGRAM_MODEL_SET_H__
+
+#include "ngram_model_internal.h"
+#include "lm3g_model.h"
+
+/**
+ * Subclass of ngram_model for grouping language models.
+ */
+typedef struct ngram_model_set_s {
+    ngram_model_t base;  /**< Base ngram_model_t structure. */
+
+    int32 n_models;      /**< Number of models in this set. */
+    int32 cur;           /**< Currently selected model, or -1 for none. */
+    ngram_model_t **lms; /**< Language models in this set. */
+    char **names;        /**< Names for language models. */
+    int32 *lweights;     /**< Log interpolation weights. */
+    int32 **widmap;      /**< Word ID mapping for submodels. */
+    int32 *maphist;      /**< Word ID mapping for N-Gram history. */
+} ngram_model_set_t;
+
+/**
+ * Iterator over a model set.
+ */
+struct ngram_model_set_iter_s {
+    ngram_model_set_t *set;
+    int32 cur;
+};
+
+#endif /* __NGRAM_MODEL_SET_H__ */