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diff --git a/example/packed_trie_map.cpp b/example/packed_trie_map.cpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*************************************************************************
+ *
+ * Copyright (c) 2020 Kohei Yoshida
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ ************************************************************************/
+
+#include <mdds/global.hpp>  // for MDDS_ASCII and MDDS_N_ELEMENTS
+#include <mdds/trie_map.hpp>
+#include <iostream>
+
+using std::cout;
+using std::endl;
+
+int main()
+{
+    using trie_map_type = mdds::packed_trie_map<mdds::trie::std_string_traits, int>;
+
+    // Entries must be known prior to creating the instance, and they must be
+    // sorted by the key in ascending order.
+    trie_map_type::entry entries[] =
+    {
+        { MDDS_ASCII("Apex"),           42214 },
+        { MDDS_ASCII("Asheville"),      87236 },
+        { MDDS_ASCII("Burlington"),     51510 },
+        { MDDS_ASCII("Cary"),          151088 },
+        { MDDS_ASCII("Chapel Hill"),    59635 },
+        { MDDS_ASCII("Charlotte"),     792862 },
+        { MDDS_ASCII("Concord"),        83506 },
+        { MDDS_ASCII("Durham"),        245475 },
+        { MDDS_ASCII("Fayetteville"),  204408 },
+        { MDDS_ASCII("Gastonia"),       73209 },
+        { MDDS_ASCII("Goldsboro"),      36306 },
+        { MDDS_ASCII("Greensboro"),    279639 },
+        { MDDS_ASCII("Greenville"),     89130 },
+        { MDDS_ASCII("Hickory"),        40361 },
+        { MDDS_ASCII("High Point"),    107741 },
+        { MDDS_ASCII("Huntersville"),   50458 },
+        { MDDS_ASCII("Jacksonville"),   69079 },
+        { MDDS_ASCII("Kannapolis"),     44359 },
+        { MDDS_ASCII("Raleigh"),       431746 },
+        { MDDS_ASCII("Rocky Mount"),    56954 },
+        { MDDS_ASCII("Wilmington"),    112067 },
+        { MDDS_ASCII("Wilson"),         49628 },
+        { MDDS_ASCII("Winston-Salem"), 236441 },
+    };
+
+    // Cities in North Carolina and their populations in 2013.
+    trie_map_type nc_cities(entries, MDDS_N_ELEMENTS(entries));
+
+    cout << "Cities that start with 'Cha' and their populations:" << endl;
+    auto results = nc_cities.prefix_search("Cha");
+    for (const auto& kv : results)
+    {
+        cout << "  " << kv.first << ": " << kv.second << endl;
+    }
+
+    cout << "Cities that start with 'W' and their populations:" << endl;
+    results = nc_cities.prefix_search("W");
+    for (const auto& kv : results)
+    {
+        cout << "  " << kv.first << ": " << kv.second << endl;
+    }
+
+    cout << "Cities that start with 'C' and their populations:" << endl;
+    results = nc_cities.prefix_search("C");
+    for (const auto& kv : results)
+    {
+        cout << "  " << kv.first << ": " << kv.second << endl;
+    }
+
+    // Individual search.
+    auto it = nc_cities.find("Wilmington");
+    cout << "Population of Wilmington: " << it->second << endl;
+
+    // You get an end position iterator when the container doesn't have the
+    // specified key.
+    it = nc_cities.find("Asheboro");
+
+    cout << "Population of Asheboro: ";
+
+    if (it == nc_cities.end())
+        cout << "not found";
+    else
+        cout << it->second;
+
+    cout << endl;
+
+    return EXIT_SUCCESS;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */