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+// Copyright 2011 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * 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.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS 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 THE COPYRIGHT
+// OWNER OR CONTRIBUTORS 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 utils/cmdline/commands_map.hpp
+/// Maintains a collection of dynamically-instantiated commands.
+///
+/// Commands need to be dynamically-instantiated because they are often
+/// complex data structures.  Instantiating them as static variables causes
+/// problems with the order of construction of globals.  The commands_map class
+/// provided by this module provides a mechanism to maintain these instantiated
+/// objects.
+
+#if !defined(UTILS_CMDLINE_COMMANDS_MAP_HPP)
+#define UTILS_CMDLINE_COMMANDS_MAP_HPP
+
+#include "utils/cmdline/commands_map_fwd.hpp"
+
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+
+#include "utils/noncopyable.hpp"
+
+
+namespace utils {
+namespace cmdline {
+
+
+/// Collection of dynamically-instantiated commands.
+template< typename BaseCommand >
+class commands_map : noncopyable {
+    /// Map of command names to their implementations.
+    typedef std::map< std::string, BaseCommand* > impl_map;
+
+    /// Map of category names to the command names they contain.
+    typedef std::map< std::string, std::set< std::string > > categories_map;
+
+    /// Collection of all available commands.
+    impl_map _commands;
+
+    /// Collection of defined categories and their commands.
+    categories_map _categories;
+
+public:
+    commands_map(void);
+    ~commands_map(void);
+
+    /// Scoped, strictly-owned pointer to a command from this map.
+    typedef typename std::auto_ptr< BaseCommand > command_ptr;
+    void insert(command_ptr, const std::string& = "");
+    void insert(BaseCommand*, const std::string& = "");
+
+    /// Type for a constant iterator.
+    typedef typename categories_map::const_iterator const_iterator;
+
+    bool empty(void) const;
+
+    const_iterator begin(void) const;
+    const_iterator end(void) const;
+
+    BaseCommand* find(const std::string&);
+    const BaseCommand* find(const std::string&) const;
+};
+
+
+}  // namespace cmdline
+}  // namespace utils
+
+
+#endif  // !defined(UTILS_CMDLINE_BASE_COMMAND_HPP)