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+// Copyright Vladimir Prus 2002-2004.
+// Copyright Bertolt Mildner 2004.
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+
+#ifndef BOOST_OPTION_DESCRIPTION_VP_2003_05_19
+#define BOOST_OPTION_DESCRIPTION_VP_2003_05_19
+
+#include <boost/program_options/config.hpp>
+#include <boost/program_options/errors.hpp>
+#include <boost/program_options/value_semantic.hpp>
+
+#include <boost/function.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/any.hpp>
+
+#include <string>
+#include <vector>
+#include <set>
+#include <map>
+#include <stdexcept>
+
+#include <iosfwd>
+
+/** Boost namespace */
+namespace boost { 
+/** Namespace for the library. */
+namespace program_options {
+
+    /** Describes one possible command line/config file option. There are two
+        kinds of properties of an option. First describe it syntactically and
+        are used only to validate input. Second affect interpretation of the
+        option, for example default value for it or function that should be
+        called  when the value is finally known. Routines which perform parsing
+        never use second kind of properties -- they are side effect free.
+        @sa options_description
+    */
+    class BOOST_PROGRAM_OPTIONS_DECL option_description {
+    public:
+
+        option_description();
+
+        /** Initializes the object with the passed data.
+
+            Note: it would be nice to make the second parameter auto_ptr,
+            to explicitly pass ownership. Unfortunately, it's often needed to
+            create objects of types derived from 'value_semantic':
+               options_description d;
+               d.add_options()("a", parameter<int>("n")->default_value(1));
+            Here, the static type returned by 'parameter' should be derived
+            from value_semantic.
+
+            Alas, derived->base conversion for auto_ptr does not really work,
+            see
+            http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2000/n1232.pdf
+            http://std.dkuug.dk/jtc1/sc22/wg21/docs/cwg_defects.html#84
+
+            So, we have to use plain old pointers. Besides, users are not
+            expected to use the constructor directly.
+
+            
+            The 'name' parameter is interpreted by the following rules:
+            - if there's no "," character in 'name', it specifies long name
+            - otherwise, the part before "," specifies long name and the part
+            after -- long name.
+        */
+        option_description(const char* name,
+                           const value_semantic* s);
+
+        /** Initializes the class with the passed data. 
+         */
+        option_description(const char* name,
+                           const value_semantic* s,
+                           const char* description);
+
+        virtual ~option_description();
+
+        enum match_result { no_match, full_match, approximate_match };
+
+        /** Given 'option', specified in the input source,
+            return 'true' is 'option' specifies *this.
+        */
+        match_result match(const std::string& option, bool approx,
+                           bool long_ignore_case, bool short_ignore_case) const;
+
+        /** Return the key that should identify the option, in
+            particular in the variables_map class.
+            The 'option' parameter is the option spelling from the
+            input source.
+            If option name contains '*', returns 'option'.
+            If long name was specified, it's the long name, otherwise
+            it's a short name with prepended '-'.
+        */
+        const std::string& key(const std::string& option) const;
+
+        const std::string& long_name() const;
+
+        /// Explanation of this option
+        const std::string& description() const;
+
+        /// Semantic of option's value
+        shared_ptr<const value_semantic> semantic() const;
+        
+        /// Returns the option name, formatted suitably for usage message. 
+        std::string format_name() const;
+
+        /** Return the parameter name and properties, formatted suitably for
+            usage message. */
+        std::string format_parameter() const;
+
+    private:
+    
+        option_description& set_name(const char* name);
+
+        std::string m_short_name, m_long_name, m_description;
+        // shared_ptr is needed to simplify memory management in
+        // copy ctor and destructor.
+        shared_ptr<const value_semantic> m_value_semantic;
+    };
+
+    class options_description;
+
+    /** Class which provides convenient creation syntax to option_description. 
+     */        
+    class BOOST_PROGRAM_OPTIONS_DECL options_description_easy_init {
+    public:
+        options_description_easy_init(options_description* owner);
+
+        options_description_easy_init&
+        operator()(const char* name,
+                   const char* description);
+
+        options_description_easy_init&
+        operator()(const char* name,
+                   const value_semantic* s);
+        
+        options_description_easy_init&
+        operator()(const char* name,
+                   const value_semantic* s,
+                   const char* description);
+       
+    private:
+        options_description* owner;
+    };
+
+
+    /** A set of option descriptions. This provides convenient interface for
+        adding new option (the add_options) method, and facilities to search
+        for options by name.
+        
+        See @ref a_adding_options "here" for option adding interface discussion.
+        @sa option_description
+    */
+    class BOOST_PROGRAM_OPTIONS_DECL options_description {
+    public:
+        static const unsigned m_default_line_length;
+        
+        /** Creates the instance. */
+        options_description(unsigned line_length = m_default_line_length,
+                            unsigned min_description_length = m_default_line_length / 2);
+        /** Creates the instance. The 'caption' parameter gives the name of
+            this 'options_description' instance. Primarily useful for output.
+            The 'description_length' specifies the number of columns that
+            should be reserved for the description text; if the option text
+            encroaches into this, then the description will start on the next
+            line.
+        */
+        options_description(const std::string& caption,
+                            unsigned line_length = m_default_line_length,
+                            unsigned min_description_length = m_default_line_length / 2);
+        /** Adds new variable description. Throws duplicate_variable_error if
+            either short or long name matches that of already present one. 
+        */
+        void add(shared_ptr<option_description> desc);
+        /** Adds a group of option description. This has the same
+            effect as adding all option_descriptions in 'desc' 
+            individually, except that output operator will show
+            a separate group.
+            Returns *this.
+        */
+        options_description& add(const options_description& desc);
+
+    public:
+        /** Returns an object of implementation-defined type suitable for adding
+            options to options_description. The returned object will
+            have overloaded operator() with parameter type matching 
+            'option_description' constructors. Calling the operator will create
+            new option_description instance and add it.
+        */
+        options_description_easy_init add_options();
+
+        const option_description& find(const std::string& name, 
+                                       bool approx, 
+                                       bool long_ignore_case = false,
+                                       bool short_ignore_case = false) const;
+
+        const option_description* find_nothrow(const std::string& name, 
+                                               bool approx,
+                                               bool long_ignore_case = false,
+                                               bool short_ignore_case = false) const;
+
+
+        const std::vector< shared_ptr<option_description> >& options() const;
+
+        /** Produces a human readable output of 'desc', listing options,
+            their descriptions and allowed parameters. Other options_description
+            instances previously passed to add will be output separately. */
+        friend BOOST_PROGRAM_OPTIONS_DECL std::ostream& operator<<(std::ostream& os, 
+                                             const options_description& desc);
+
+        /** Output 'desc' to the specified stream, calling 'f' to output each
+            option_description element. */
+        void print(std::ostream& os) const;
+
+    private:
+        typedef std::map<std::string, int>::const_iterator name2index_iterator;
+        typedef std::pair<name2index_iterator, name2index_iterator> 
+            approximation_range;
+
+        //approximation_range find_approximation(const std::string& prefix) const;
+
+        std::string m_caption;
+        const unsigned m_line_length;
+        const unsigned m_min_description_length;
+        
+        // Data organization is chosen because:
+        // - there could be two names for one option
+        // - option_add_proxy needs to know the last added option
+        std::vector< shared_ptr<option_description> > m_options;
+
+        // Whether the option comes from one of declared groups.
+#if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, BOOST_TESTED_AT(313))
+        // vector<bool> is buggy there, see
+        // http://support.microsoft.com/default.aspx?scid=kb;en-us;837698
+        std::vector<char> belong_to_group;
+#else
+        std::vector<bool> belong_to_group;
+#endif
+
+        std::vector< shared_ptr<options_description> > groups;
+
+    };
+
+    /** Class thrown when duplicate option description is found. */
+    class BOOST_PROGRAM_OPTIONS_DECL duplicate_option_error : public error {
+    public:
+        duplicate_option_error(const std::string& what) : error(what) {}
+    };
+}}
+
+#endif