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+/* 
+ *  libpinyin
+ *  Library to deal with pinyin.
+ *  
+ *  Copyright (C) 2017 Peng Wu <alexepico@gmail.com>
+ *  
+ *  This program 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 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PHONETIC_LOOKUP_H
+#define PHONETIC_LOOKUP_H
+
+
+#include "novel_types.h"
+#include <limits.h>
+
+namespace pinyin{
+
+struct trellis_value_t {
+    phrase_token_t m_handles[2];
+    // the character length of the final sentence.
+    gint32 m_sentence_length;
+    gfloat m_poss;
+    // the m_last_step and m_last_index points to this trellis.
+    gint32 m_last_step;
+    gint32 m_last_index;
+};
+
+template <gint32 nbest>
+struct trellis_node {
+private:
+    gint32 m_nelem;
+    trellis_value_t m_elements[nbest];
+public:
+
+};
+
+struct matrix_value_t {
+    phrase_token_t m_cur_token;
+    gfloat m_poss;
+    // the below information for recovering the final phrase array.
+    // the m_next_step and m_next_index points to this matrix.
+    gint32 m_next_step;
+    gint32 m_next_index;
+};
+
+template <gint32 nbest>
+struct matrix_step {
+private:
+    gint32 m_nelem;
+    matrix_value_t m_elements[nbest];
+public:
+
+};
+
+struct trellis_constraint_t {
+    constraint_type m_type;
+    // expand the previous union into struct to catch some errors.
+    phrase_token_t m_token;
+    guint32 m_constraint_step;
+};
+
+
+};
+
+#endif