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37 * Defines gmx::AbstractOption, gmx::OptionTemplate and gmx::OptionInfo.
39 * This header defines base classes for option settings that are used with
40 * Options::addOption(). These classes implement the "named parameter"
41 * idiom for specifying option properties.
43 * These classes also take care of creating and setting up the actual option
46 * This header is needed directly only when implementing new option types,
47 * but methods of OptionTemplate are visible even to the normal user through
50 * \author Teemu Murtola <teemu.murtola@gmail.com>
52 * \ingroup module_options
54 #ifndef GMX_OPTIONS_ABSTRACTOPTION_H
55 #define GMX_OPTIONS_ABSTRACTOPTION_H
60 #include "../utility/common.h"
61 #include "../utility/uniqueptr.h"
63 #include "optionflags.h"
68 class AbstractOptionStorage;
69 template <typename T> class OptionStorageTemplate;
70 class OptionManagerContainer;
73 //! Smart pointer for managing an AbstractOptionStorage object.
74 typedef gmx_unique_ptr<AbstractOptionStorage>::type
75 AbstractOptionStoragePointer;
78 * Abstract base class for specifying option properties.
80 * Concrete classes should normally not derive directly from this class,
81 * but from OptionTemplate instead. Classes derived from this class
82 * are mainly designed to implement the "named parameter" idiom. For
83 * efficiency and clarity, these classes should only store values provided to
84 * them. All error checking and memory management should be postponed to the
85 * point when the actual option is created.
87 * Subclasses should override createStorage() to create the correct type
88 * of storage object. If they use their own info type derived from OptionInfo,
89 * they should also have a public typedef \c InfoType that specifies that
90 * info type. This is required for Options::addOption() to return the correct
93 * \ingroup module_options
98 // Virtual only for completeness, in normal use should not be needed.
99 virtual ~AbstractOption() { }
103 //! Initializes the name and default values for an option.
104 explicit AbstractOption(const char *name)
105 : minValueCount_(1), maxValueCount_(1),
106 name_(name), descr_(NULL)
110 * Creates a default storage object for the option.
112 * \param[in] managers Manager container (unused if the option does
113 * not use a manager).
114 * \returns The created storage object.
115 * \throws APIError if invalid option settings have been provided.
117 * This method is called by Options::addOption() when initializing an
118 * option from the settings.
120 * Derived classes should implement the method to create an actual
121 * storage object and populate it with correct values.
122 * They should also throw APIError if they detect problems.
124 * Should only be called by Options::addOption().
126 virtual AbstractOptionStoragePointer createStorage(
127 const OptionManagerContainer &managers) const = 0;
129 //! Sets the description for the option.
130 void setDescription(const char *descr) { descr_ = descr; }
131 //! Sets a flag for the option.
132 void setFlag(OptionFlag flag) { flags_.set(flag); }
133 //! Clears a flag for the option.
134 void clearFlag(OptionFlag flag) { flags_.clear(flag); }
135 //! Sets or clears a flag for the option.
136 void setFlag(OptionFlag flag, bool bSet) { flags_.set(flag, bSet); }
137 //! Returns true if the option is vector-valued.
138 bool isVector() const { return hasFlag(efOption_Vector); }
140 * Sets the option to be vector-valued.
142 * This method is provided for convenience to make management of value
143 * counts easier. In order to implement a vector-valued option, the
144 * class derived from AbstractOption should expose a method that calls
145 * this method, and the storage object derived from
146 * AbstractOptionStorage should check isVector().
147 * If only a single value is provided, the storage object should fill
148 * the whole vector with that value.
150 * The length of the vector (the value of maxValueCount_) must be
151 * fixed. The default length is 3 elements.
155 setFlag(efOption_Vector);
157 if (maxValueCount_ == 1)
162 //! Sets the required number of values for the option.
163 void setValueCount(int count)
165 if (!hasFlag(efOption_Vector))
167 minValueCount_ = count;
169 maxValueCount_ = count;
172 //! Minimum number of values required for the option.
174 //! Maximum number of values allowed for the option.
179 //! Returns true if a flag has been set.
180 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
183 //! Pointer to description of the option.
188 * Needed to initialize an AbstractOptionStorage object from this class
189 * without otherwise unnecessary accessors.
191 friend class AbstractOptionStorage;
193 * Needed to be able to call createStorage().
195 friend class Options;
199 * Templated base class for constructing concrete option settings classes.
201 * \tparam T Assignable type that stores a single option value.
202 * \tparam U Type of the derived class.
204 * This template is used as a base class like this:
206 class ConcreteOption : public OptionTemplate<int, ConcreteOption>
210 * All public functions in this class return \c *this casted to a reference to
211 * \p U. They do not throw.
213 * For examples of how to use classes derived from this class, see the class
214 * documentation for Options.
217 * \ingroup module_options
219 template <typename T, class U>
220 class OptionTemplate : public AbstractOption
223 //! Type that stores a single option value.
225 //! Alias for the derived class type.
229 * Sets a description for the option.
231 * \param[in] descr Description to set.
233 * String in \p descr is copied when the option is created.
235 MyClass &description(const char *descr)
236 { setDescription(descr); return me(); }
237 //! Hides the option from normal help output.
238 MyClass &hidden(bool bHidden = true)
239 { setFlag(efOption_Hidden, bHidden); return me(); }
241 * Requires the option to be specified explicitly.
243 * Note that if you specify defaultValue() together with required(),
244 * the user is not required to explicitly provide the option.
245 * In this case, required() only affects possible help output.
247 MyClass &required(bool bRequired = true)
248 { setFlag(efOption_Required, bRequired); return me(); }
249 //! Allows the option to be specified multiple times.
250 MyClass &allowMultiple(bool bMulti = true)
251 { setFlag(efOption_MultipleTimes, bMulti); return me(); }
252 //! Requires exactly \p count values for the option.
253 MyClass &valueCount(int count) { setValueCount(count); return me(); }
254 //! Allows any number of values for the option.
255 MyClass &multiValue(bool bMulti = true)
256 { if (bMulti) { maxValueCount_ = -1; } return me(); }
259 * Sets a default value for the option.
261 * \param[in] defaultValue Default value.
263 * If the option is never set, the default value is copied to the
264 * assigned storage. Note that if the option is not set and there
265 * is no default value, the storage is not altered, which can also be
266 * used to provide a default value. The latter method has to be used
267 * if the option can take multiple values.
269 * \p defaultValue is copied when the option is created.
271 MyClass &defaultValue(const T &defaultValue)
272 { defaultValue_ = &defaultValue; return me(); }
274 * Sets a default value for the option when it is set.
276 * \param[in] defaultValue Default value.
278 * This value is used if the option is set, but no value is provided.
279 * If the option is never set, the value set with defaultValue() is
280 * used. Can only be used for options that accept a single value.
282 * \p defaultValue is copied when the option is created.
284 MyClass &defaultValueIfSet(const T &defaultValue)
285 { defaultValueIfSet_ = &defaultValue; return me(); }
287 * Stores value(s) in memory pointed by \p store.
289 * \param[in] store Storage for option value(s).
291 * The caller is responsible for allocating enough memory such that
292 * the any allowed number of values fits into the array pointed by
293 * \p store. If there is no maximum allowed number or if the maximum
294 * is inconveniently large, storeVector() should be used.
296 * For information on when values are available in the storage, see
299 * The pointer provided should remain valid as long as the associated
300 * Options object exists.
302 MyClass &store(T *store)
303 { store_ = store; return me(); }
305 * Stores number of values in the value pointed by \p countptr.
307 * \param[in] countptr Storage for the number of values.
309 * For information on when values are available in the storage, see
312 * The pointers provided should remain valid as long as the associated
313 * Options object exists.
315 MyClass &storeCount(int *countptr)
316 { countptr_ = countptr; return me(); }
318 * Stores option values in the provided vector.
320 * \param[in] store Vector to store option values in.
322 * Values are added to the vector after each successful set of values
323 * is parsed. Note that for some options, the value may be changed
324 * later, and is only guaranteed to be correct after Options::finish()
327 * The pointer provided should remain valid as long as the associated
328 * Options object exists.
330 MyClass &storeVector(std::vector<T> *store)
331 { storeVector_ = store; return me(); }
335 //! Alias for the template class for use in base classes.
336 typedef OptionTemplate<T, U> MyBase;
338 //! Initializes the name and default values for an option.
339 explicit OptionTemplate(const char *name)
340 : AbstractOption(name),
341 defaultValue_(NULL), defaultValueIfSet_(NULL), store_(NULL),
342 countptr_(NULL), storeVector_(NULL)
346 * Returns a pointer to user-specified default value, or NULL if there
349 const T *defaultValue() const { return defaultValue_; }
351 * Returns a pointer to user-specified default value, or NULL if there
354 const T *defaultValueIfSet() const { return defaultValueIfSet_; }
355 //! Returns \p *this casted into MyClass to reduce typing.
356 MyClass &me() { return static_cast<MyClass &>(*this); }
360 const T *defaultValue_;
361 const T *defaultValueIfSet_;
364 std::vector<T> *storeVector_;
367 * Needed to initialize storage from this class without otherwise
368 * unnecessary accessors.
370 friend class OptionStorageTemplate<T>;
374 * Gives information and allows modifications to an option after creation.
376 * When an option is added with Options::addOption(), an object of a subclass
377 * of OptionInfo is returned. This object can be later used to access
378 * information about the option. Non-const methods also allow later changing
379 * (some of) the option settings provided at initialization time.
380 * The properties accessible/modifiable through this interface are implemented
381 * based on need, and may not be implemented for all cases.
384 * This class is also used by OptionsVisitor and OptionsModifyingVisitor as
385 * the interface that allows querying/modifying each visited option.
388 * This class isolates the details of the internal option implementation from
389 * callers. Although this class is a simple reference to the underlying
390 * implementation, it is implemented as non-copyable to allow const/non-const
391 * status of a reference to this class to indicate whether modifications are
392 * allowed. Otherwise, separate classes would be needed for access and
393 * modification, complicating the implementation. In the implementation,
394 * there is always a single OptionInfo instance referring to one option.
395 * The underlying implementation object always owns this instance, and only
396 * references are passed to callers.
398 * \see Options::addOption()
400 * \see OptionsVisitor
401 * \see OptionsModifyingVisitor
405 * \ingroup module_options
410 virtual ~OptionInfo();
413 * Test whether the option is of a particular type.
415 * \tparam InfoType Option type to test for. Should be a class derived
418 template <class InfoType>
421 return toType<InfoType>() != NULL;
424 * Convert the info object to a particular type if the type is correct.
426 * \tparam InfoType Option type to convert to. Should be a class
427 * derived from OptionInfo.
428 * \retval this converted to a pointer to \p InfoType, or NULL if the
429 * conversion is not possible.
431 template <class InfoType>
434 return dynamic_cast<InfoType *>(this);
436 //! \copydoc toType()
437 template <class InfoType>
438 const InfoType *toType() const
440 return dynamic_cast<const InfoType *>(this);
443 //! Returns true if the option has been set.
445 //! Returns true if the option is a hidden option.
446 bool isHidden() const;
447 //! Returns true if the option is required.
448 bool isRequired() const;
449 //! Returns the minimum number of values that this option accepts.
450 int minValueCount() const;
451 //! Returns the maximum number of values that this option accepts.
452 int maxValueCount() const;
453 //! Returns the name of the option.
454 const std::string &name() const;
455 //! Returns the type of the option as a string.
456 std::string type() const;
457 //! Returns the description of the option.
458 std::string formatDescription() const;
460 * Returns the default value if set for the option as a string.
462 * \see OptionTemplate::defaultValueIfSet()
464 std::string formatDefaultValueIfSet() const;
466 //! Returns the number of values given for the option.
467 int valueCount() const;
468 //! Returns the i'th value of the option as a string.
469 std::string formatValue(int i) const;
474 * Wraps a given option object.
478 explicit OptionInfo(AbstractOptionStorage *option);
480 //! Returns the wrapped option storage object.
481 AbstractOptionStorage &option() { return option_; }
482 //! Returns the wrapped option storage object.
483 const AbstractOptionStorage &option() const { return option_; }
487 //! The wrapped option.
488 AbstractOptionStorage &option_;
490 GMX_DISALLOW_COPY_AND_ASSIGN(OptionInfo);