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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 "gromacs/options/abstractoption.h"
52 #include "gromacs/utility/common.h"
53 #include "gromacs/utility/gmxassert.h"
58 template <typename T> class ConstArrayRef;
61 class OptionsAssigner;
62 class OptionsIterator;
65 * Base class for option managers.
67 * This class is used as a marker for all classes that are used with
68 * Options::addManager(). It doesn't provide any methods, but only supports
69 * transporting these classes through the Options collection into the
70 * individual option implementation classes.
72 * The virtual destructor is present to make this class polymorphic, such that
73 * `dynamic_cast` can be used when retrieving a manager of a certain type for
74 * the individual options.
77 * \ingroup module_options
79 class OptionManagerInterface
82 virtual ~OptionManagerInterface();
86 * Collection of options.
88 * This class provides a standard interface for implementing input options.
89 * Standard usage is to write a method that creates an Options that is owned by
90 * the object, populates it with supported options, and then returns it:
92 // <as class attributes>
94 Options options("common", "Common Options");
99 using gmx::StringOption;
100 using gmx::IntegerOption;
101 options.addOption(StringOption("arg1").store(&arg1));
102 options.addOption(IntegerOption("arg2").store(&arg2));
105 * The caller of that method can then use a parser implementation such as
106 * CommandLineParser to provide values for the options.
108 * Header basicoptions.h provides declarations of several standard
109 * option types for use with addOption(). Documentation of those classes
110 * also give more examples of how to define options.
112 * In order to keep the public interface of this class simple and to reduce
113 * build dependencies on objects that simply provide options, functionality
114 * to assign values to options is provided by a separate OptionsAssigner class.
115 * Similarly, functionality for looping over all options (e.g., for writing out
116 * help) is provided by OptionsIterator.
119 * \ingroup module_options
125 * Initializes the name and title of an option collection.
127 * \param[in] name Single-word name.
128 * \param[in] title Descriptive title.
130 * Copies the input strings.
132 Options(const char *name, const char *title);
135 //! Returns the short name of the option collection.
136 const std::string &name() const;
137 //! Returns the title of the option collection.
138 const std::string &title() const;
139 //! Returns the full description of the option collection.
140 const std::string &description() const;
143 * Sets the full description of the option collection.
145 * \param[in] desc String to set as the description.
147 * This overload is mainly useful if the description is very short.
148 * Currently this is mostly the case in unit testing.
150 void setDescription(const std::string &desc);
152 * Sets the full description of the option collection from string array.
154 * \param[in] descArray String array to set as the description.
156 * All strings in `descArray` are concatenated to form the description.
157 * Spaces are inserted between strings if they are missing.
161 const char *const desc[] = {
162 "This is the description",
166 gmx::Options options(NULL, NULL);
167 options.setDescription(desc);
170 * To use this overload, you must also include
171 * `gromacs/utility/arrayref.h`.
173 void setDescription(const ConstArrayRef<const char *> &descArray);
176 * Adds an option manager.
178 * \param manager Manager to add.
179 * \throws std::bad_alloc if out of memory.
181 * Option managers are used by some types of options that require
182 * interaction between different option instances (e.g., selection
183 * options), or need to support globally set properties (e.g., a global
184 * default file prefix). Option objects can retrieve the pointer to
185 * their manager when they are created, and the caller can alter the
186 * behavior of the options through the manager.
187 * See the individual managers for details.
189 * Caller is responsible for memory management of \p manager.
190 * The Options object (and its contained options) only stores a
191 * reference to the object.
193 * This method cannot be called after adding options or subsections.
195 void addManager(OptionManagerInterface *manager);
198 * Adds an option collection as a subsection of this collection.
200 * \param[in] section Subsection to add.
202 * The name() field of \p section is used as the name of the
203 * subsection. If an attempt is made to add two different subsections
204 * with the same name, this function asserts.
206 * \p section should not have any options added at the point this
209 * Only a pointer to the provided object is stored. The caller is
210 * responsible that the object exists for the lifetime of the
212 * It is not possible to add the same Options object as a subsection to
213 * several different Options.
214 * If an attempt is made, the function asserts.
216 void addSubSection(Options *section);
218 * Adds a recognized option to the collection.
220 * \param[in] settings Option description.
221 * \returns OptionInfo object for the created option (never NULL).
222 * \throws APIError if invalid option settings are provided.
224 * This method provides the internal implementation, but in most cases
225 * the templated method is called from user code.
226 * See the templated method for more details.
228 OptionInfo *addOption(const AbstractOption &settings);
230 * Adds a recognized option to the collection.
232 * \tparam OptionType Type of the options description object.
233 * \param[in] settings Option description.
234 * \returns OptionInfo object for the created option (never NULL).
235 * \throws APIError if invalid option settings are provided.
237 * The return value is a pointer for more convenient use in callers:
238 * often callers need to declare the variable that will hold the return
239 * value in wider scope than would be achieved by declaring it at the
240 * site where addOption() is called.
241 * The returned pointer must not be freed.
243 * See \link Options class documentation \endlink for example usage.
246 * \p OptionType::InfoType must specify a type that derives from
247 * OptionInfo and matches the type that is returned by
248 * AbstractOptionStorage::optionInfo() for the storage object that
249 * corresponds to \p OptionType.
251 template <class OptionType>
252 typename OptionType::InfoType *addOption(const OptionType &settings)
255 = addOption(static_cast<const AbstractOption &>(settings));
256 GMX_ASSERT(info->isType<typename OptionType::InfoType>(),
257 "Mismatching option info type declaration and implementation");
258 return info->toType<typename OptionType::InfoType>();
261 //! Returns true if option \p name is set.
262 bool isSet(const char *name) const;
264 * Notifies the collection that all option values are assigned.
266 * \throws InvalidInputError if invalid user input is detected.
268 * This function should be called after no more option values are
269 * to be assigned. Values in storage variables are guaranteed to be
270 * available only after this call, although in most cases, they are
271 * available already during assignment.
273 * If invalid option values, e.g., missing required option, is detected
274 * at this point, this function throws. The thrown exception contains
275 * information on all errors detected during the call.
282 PrivateImplPointer<Impl> impl_;
284 //! Needed to be able to extend the interface of this object.
285 friend class OptionsAssigner;
286 //! Needed to be able to extend the interface of this object.
287 friend class OptionsIterator;
288 //! Needed to be able to extend the interface of this object.
289 friend class OptionsModifyingIterator;