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37 * Declares gmx::Options.
39 * Together with basicoptions.h, this header forms the part of the public
40 * API that most classes will use to provide options.
42 * \author Teemu Murtola <teemu.murtola@gmail.com>
44 * \ingroup module_options
46 #ifndef GMX_OPTIONS_OPTIONS_H
47 #define GMX_OPTIONS_OPTIONS_H
51 #include "../utility/common.h"
52 #include "../utility/gmxassert.h"
54 #include "abstractoption.h"
60 class OptionsAssigner;
61 class OptionsIterator;
64 * Collection of options.
66 * This class provides a standard interface for implementing input options.
67 * Standard usage is to write a method that creates an Options that is owned by
68 * the object, populates it with supported options, and then returns it:
70 // <as class attributes>
72 Options options("common", "Common Options");
77 using gmx::StringOption;
78 using gmx::IntegerOption;
79 options.addOption(StringOption("arg1").store(&arg1));
80 options.addOption(IntegerOption("arg2").store(&arg2));
83 * The caller of that method can then use a parser implementation such as
84 * CommandLineParser to provide values for the options.
86 * Header basicoptions.h provides declarations of several standard
87 * option types for use with addOption(). Documentation of those classes
88 * also give more examples of how to define options.
90 * In order to keep the public interface of this class simple and to reduce
91 * build dependencies on objects that simply provide options, functionality
92 * to assign values to options is provided by a separate OptionsAssigner class.
93 * Similarly, functionality for looping over all options (e.g., for writing out
94 * help) is provided by OptionsIterator.
97 * \ingroup module_options
103 * Initializes the name and title of an option collection.
105 * \param[in] name Single-word name.
106 * \param[in] title Descriptive title.
108 * Copies the input strings.
110 Options(const char *name, const char *title);
113 //! Returns the short name of the option collection.
114 const std::string &name() const;
115 //! Returns the title of the option collection.
116 const std::string &title() const;
117 //! Returns the full description of the option collection.
118 const std::string &description() const;
121 * Sets the full description of the option collection.
123 * \param[in] desc String to set as the description.
125 * concatenateStrings() is useful for forming the input string.
127 void setDescription(const std::string &desc);
128 //int addBugs(int nbugs, const char *const *bugs);
131 * Adds an option collection as a subsection of this collection.
133 * \param[in] section Subsection to add.
135 * The name() field of \p section is used as the name of the
136 * subsection. If an attempt is made to add two different subsections
137 * with the same name, this function asserts.
139 * For certain functionality to work properly, no options should
140 * be added to the subsection after it has been added to another
143 * Only a pointer to the provided object is stored. The caller is
144 * responsible that the object exists for the lifetime of the
146 * It is not possible to add the same Options object as a subsection to
147 * several different Options.
148 * If an attempt is made, the function asserts.
150 void addSubSection(Options *section);
152 * Adds a recognized option to the collection.
154 * \param[in] settings Option description.
155 * \returns OptionInfo object for the created option (never NULL).
156 * \throws APIError if invalid option settings are provided.
158 * This method provides the internal implementation, but in most cases
159 * the templated method is called from user code.
160 * See the templated method for more details.
162 OptionInfo *addOption(const AbstractOption &settings);
164 * Adds a recognized option to the collection.
166 * \tparam OptionType Type of the options description object.
167 * \param[in] settings Option description.
168 * \returns OptionInfo object for the created option (never NULL).
169 * \throws APIError if invalid option settings are provided.
171 * The return value is a pointer for more convenient use in callers:
172 * often callers need to declare the variable that will hold the return
173 * value in wider scope than would be achieved by declaring it at the
174 * site where addOption() is called.
175 * The returned pointer must not be freed.
177 * See \link Options class documentation \endlink for example usage.
180 * \p OptionType::InfoType must specify a type that derives from
181 * OptionInfo and matches the type that is returned by
182 * AbstractOptionStorage::optionInfo() for the storage object that
183 * corresponds to \p OptionType.
185 template <class OptionType>
186 typename OptionType::InfoType *addOption(const OptionType &settings)
189 = addOption(static_cast<const AbstractOption &>(settings));
190 GMX_ASSERT(info->isType<typename OptionType::InfoType>(),
191 "Mismatching option info type declaration and implementation");
192 return info->toType<typename OptionType::InfoType>();
195 //! Returns true if option \p name is set.
196 bool isSet(const char *name) const;
198 * Notifies the collection that all option values are assigned.
200 * \throws InvalidInputError if invalid user input is detected.
202 * This function should be called after no more option values are
203 * to be assigned. Values in storage variables are guaranteed to be
204 * available only after this call, although in most cases, they are
205 * available already during assignment.
207 * If invalid option values, e.g., missing required option, is detected
208 * at this point, this function throws. The thrown exception contains
209 * information on all errors detected during the call.
216 PrivateImplPointer<Impl> impl_;
218 //! Needed to be able to extend the interface of this object.
219 friend class OptionsAssigner;
220 //! Needed to be able to extend the interface of this object.
221 friend class OptionsIterator;
222 //! Needed to be able to extend the interface of this object.
223 friend class OptionsModifyingIterator;