author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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// Copyright Vladimir Prus 2002-2004. |
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// Copyright Bertolt Mildner 2004. |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt |
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// or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_OPTION_DESCRIPTION_VP_2003_05_19 |
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#define BOOST_OPTION_DESCRIPTION_VP_2003_05_19 |
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#include <boost/program_options/config.hpp> |
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#include <boost/program_options/errors.hpp> |
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#include <boost/program_options/value_semantic.hpp> |
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#include <boost/function.hpp> |
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#include <boost/shared_ptr.hpp> |
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#include <boost/detail/workaround.hpp> |
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#include <boost/any.hpp> |
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#include <string> |
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#include <vector> |
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#include <set> |
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#include <map> |
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#include <stdexcept> |
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#include <iosfwd> |
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/** Boost namespace */ |
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namespace boost { |
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/** Namespace for the library. */ |
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namespace program_options { |
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/** Describes one possible command line/config file option. There are two |
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kinds of properties of an option. First describe it syntactically and |
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are used only to validate input. Second affect interpretation of the |
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option, for example default value for it or function that should be |
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called when the value is finally known. Routines which perform parsing |
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never use second kind of properties -- they are side effect free. |
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@sa options_description |
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*/ |
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class BOOST_PROGRAM_OPTIONS_DECL option_description { |
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public: |
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option_description(); |
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/** Initializes the object with the passed data. |
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Note: it would be nice to make the second parameter auto_ptr, |
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to explicitly pass ownership. Unfortunately, it's often needed to |
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create objects of types derived from 'value_semantic': |
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options_description d; |
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d.add_options()("a", parameter<int>("n")->default_value(1)); |
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Here, the static type returned by 'parameter' should be derived |
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from value_semantic. |
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Alas, derived->base conversion for auto_ptr does not really work, |
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see |
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http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2000/n1232.pdf |
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http://std.dkuug.dk/jtc1/sc22/wg21/docs/cwg_defects.html#84 |
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So, we have to use plain old pointers. Besides, users are not |
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expected to use the constructor directly. |
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The 'name' parameter is interpreted by the following rules: |
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- if there's no "," character in 'name', it specifies long name |
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- otherwise, the part before "," specifies long name and the part |
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after -- long name. |
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*/ |
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option_description(const char* name, |
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const value_semantic* s); |
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/** Initializes the class with the passed data. |
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*/ |
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option_description(const char* name, |
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const value_semantic* s, |
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const char* description); |
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virtual ~option_description(); |
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enum match_result { no_match, full_match, approximate_match }; |
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/** Given 'option', specified in the input source, |
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return 'true' is 'option' specifies *this. |
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*/ |
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match_result match(const std::string& option, bool approx) const; |
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/** Return the key that should identify the option, in |
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particular in the variables_map class. |
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The 'option' parameter is the option spelling from the |
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input source. |
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If option name contains '*', returns 'option'. |
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If long name was specified, it's the long name, otherwise |
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it's a short name with prepended '-'. |
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*/ |
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const std::string& key(const std::string& option) const; |
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const std::string& long_name() const; |
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/// Explanation of this option |
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const std::string& description() const; |
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/// Semantic of option's value |
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shared_ptr<const value_semantic> semantic() const; |
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/// Returns the option name, formatted suitably for usage message. |
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std::string format_name() const; |
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/** Return the parameter name and properties, formatted suitably for |
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usage message. */ |
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std::string format_parameter() const; |
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private: |
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option_description& set_name(const char* name); |
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std::string m_short_name, m_long_name, m_description; |
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// shared_ptr is needed to simplify memory management in |
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// copy ctor and destructor. |
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shared_ptr<const value_semantic> m_value_semantic; |
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}; |
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class options_description; |
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/** Class which provides convenient creation syntax to option_description. |
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*/ |
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class BOOST_PROGRAM_OPTIONS_DECL options_description_easy_init { |
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public: |
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options_description_easy_init(options_description* owner); |
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options_description_easy_init& |
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operator()(const char* name, |
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const char* description); |
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options_description_easy_init& |
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operator()(const char* name, |
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const value_semantic* s); |
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options_description_easy_init& |
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operator()(const char* name, |
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const value_semantic* s, |
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const char* description); |
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private: |
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options_description* owner; |
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}; |
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/** A set of option descriptions. This provides convenient interface for |
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adding new option (the add_options) method, and facilities to search |
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for options by name. |
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See @ref a_adding_options "here" for option adding interface discussion. |
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@sa option_description |
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*/ |
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class BOOST_PROGRAM_OPTIONS_DECL options_description { |
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public: |
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static const unsigned m_default_line_length = 80; |
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/** Creates the instance. */ |
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options_description(unsigned line_length = m_default_line_length); |
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/** Creates the instance. The 'caption' parameter gives the name of |
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this 'options_description' instance. Primarily useful for output. |
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*/ |
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options_description(const std::string& caption, |
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unsigned line_length = m_default_line_length); |
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/** Adds new variable description. Throws duplicate_variable_error if |
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either short or long name matches that of already present one. |
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*/ |
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void add(shared_ptr<option_description> desc); |
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/** Adds a group of option description. This has the same |
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effect as adding all option_descriptions in 'desc' |
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individually, except that output operator will show |
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a separate group. |
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Returns *this. |
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*/ |
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options_description& add(const options_description& desc); |
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public: |
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/** Returns an object of implementation-defined type suitable for adding |
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options to options_description. The returned object will |
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have overloaded operator() with parameter type matching |
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'option_description' constructors. Calling the operator will create |
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new option_description instance and add it. |
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*/ |
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options_description_easy_init add_options(); |
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const option_description& find(const std::string& name, bool approx) |
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const; |
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const option_description* find_nothrow(const std::string& name, |
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bool approx) const; |
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const std::vector< shared_ptr<option_description> >& options() const; |
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/** Produces a human readable output of 'desc', listing options, |
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their descriptions and allowed parameters. Other options_description |
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instances previously passed to add will be output separately. */ |
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friend BOOST_PROGRAM_OPTIONS_DECL std::ostream& operator<<(std::ostream& os, |
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const options_description& desc); |
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/** Output 'desc' to the specified stream, calling 'f' to output each |
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option_description element. */ |
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void print(std::ostream& os) const; |
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private: |
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typedef std::map<std::string, int>::const_iterator name2index_iterator; |
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typedef std::pair<name2index_iterator, name2index_iterator> |
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approximation_range; |
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//approximation_range find_approximation(const std::string& prefix) const; |
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std::string m_caption; |
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const unsigned m_line_length; |
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// Data organization is chosen because: |
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// - there could be two names for one option |
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// - option_add_proxy needs to know the last added option |
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std::vector< shared_ptr<option_description> > m_options; |
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// Whether the option comes from one of declared groups. |
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#if BOOST_WORKAROUND(BOOST_DINKUMWARE_STDLIB, BOOST_TESTED_AT(313)) |
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// vector<bool> is buggy there, see |
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// http://support.microsoft.com/default.aspx?scid=kb;en-us;837698 |
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std::vector<char> belong_to_group; |
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#else |
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std::vector<bool> belong_to_group; |
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#endif |
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std::vector< shared_ptr<options_description> > groups; |
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}; |
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/** Class thrown when duplicate option description is found. */ |
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class BOOST_PROGRAM_OPTIONS_DECL duplicate_option_error : public error { |
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public: |
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duplicate_option_error(const std::string& what) : error(what) {} |
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}; |
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}} |
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#endif |