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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;
72 //! Smart pointer for managing an AbstractOptionStorage object.
73 typedef gmx_unique_ptr<AbstractOptionStorage>::type
74 AbstractOptionStoragePointer;
77 * Abstract base class for specifying option properties.
79 * Concrete classes should normally not derive directly from this class,
80 * but from OptionTemplate instead. Classes derived from this class
81 * are mainly designed to implement the "named parameter" idiom. For
82 * efficiency and clarity, these classes should only store values provided to
83 * them. All error checking and memory management should be postponed to the
84 * point when the actual option is created.
86 * Subclasses should override createStorage() to create the correct type
87 * of storage object. If they use their own info type derived from OptionInfo,
88 * they should also have a public typedef \c InfoType that specifies that
89 * info type. This is required for Options::addOption() to return the correct
92 * \ingroup module_options
97 // Virtual only for completeness, in normal use should not be needed.
98 virtual ~AbstractOption() { }
102 //! Initializes the name and default values for an option.
103 explicit AbstractOption(const char *name)
104 : minValueCount_(1), maxValueCount_(1),
105 name_(name), descr_(NULL)
109 * Creates a default storage object for the option.
111 * \returns The created storage object.
112 * \throws APIError if invalid option settings have been provided.
114 * This method is called by Options::addOption() when initializing an
115 * option from the settings.
117 * Derived classes should implement the method to create an actual
118 * storage object and populate it with correct values.
119 * They should also throw APIError if they detect problems.
121 * Should only be called by Options::addOption().
123 virtual AbstractOptionStoragePointer createStorage() const = 0;
126 * Creates the description string for the option.
128 * \returns Description string for the option.
130 * This function is virtual to allow derived classes to customize the
131 * description programmatically, e.g., by adding the list of allowed
133 * The default implementation simply returns the user-provided
136 virtual std::string createDescription() const
137 { return descr_ ? descr_ : ""; }
139 //! Sets the description for the option.
140 void setDescription(const char *descr) { descr_ = descr; }
141 //! Sets a flag for the option.
142 void setFlag(OptionFlag flag) { flags_.set(flag); }
143 //! Clears a flag for the option.
144 void clearFlag(OptionFlag flag) { flags_.clear(flag); }
145 //! Sets or clears a flag for the option.
146 void setFlag(OptionFlag flag, bool bSet) { flags_.set(flag, bSet); }
147 //! Returns true if the option is vector-valued.
148 bool isVector() const { return hasFlag(efOption_Vector); }
150 * Sets the option to be vector-valued.
152 * This method is provided for convenience to make management of value
153 * counts easier. In order to implement a vector-valued option, the
154 * class derived from AbstractOption should expose a method that calls
155 * this method, and the storage object derived from
156 * AbstractOptionStorage should check isVector().
157 * If only a single value is provided, the storage object should fill
158 * the whole vector with that value.
160 * The length of the vector (the value of maxValueCount_) must be
161 * fixed. The default length is 3 elements.
165 setFlag(efOption_Vector);
167 if (maxValueCount_ == 1)
172 //! Sets the required number of values for the option.
173 void setValueCount(int count)
175 if (!hasFlag(efOption_Vector))
177 minValueCount_ = count;
179 maxValueCount_ = count;
182 //! Minimum number of values required for the option.
184 //! Maximum number of values allowed for the option.
189 //! Returns true if a flag has been set.
190 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
193 //! Pointer to description of the option.
198 * Needed to initialize an AbstractOptionStorage object from this class
199 * without otherwise unnecessary accessors.
201 friend class AbstractOptionStorage;
203 * Needed to be able to call createStorage().
205 friend class Options;
209 * Templated base class for constructing concrete option settings classes.
211 * \tparam T Assignable type that stores a single option value.
212 * \tparam U Type of the derived class.
214 * This template is used as a base class like this:
216 class ConcreteOption : public OptionTemplate<int, ConcreteOption>
220 * All public functions in this class return \c *this casted to a reference to
221 * \p U. They do not throw.
223 * For examples of how to use classes derived from this class, see the class
224 * documentation for Options.
227 * \ingroup module_options
229 template <typename T, class U>
230 class OptionTemplate : public AbstractOption
233 //! Type that stores a single option value.
235 //! Alias for the derived class type.
239 * Sets a description for the option.
241 * \param[in] descr Description to set.
243 * String in \p descr is copied when the option is created.
245 MyClass &description(const char *descr)
246 { setDescription(descr); return me(); }
247 //! Hides the option from normal help output.
248 MyClass &hidden(bool bHidden = true)
249 { setFlag(efOption_Hidden, bHidden); return me(); }
251 * Requires the option to be specified explicitly.
253 * Note that if you specify defaultValue() together with required(),
254 * the user is not required to explicitly provide the option.
255 * In this case, required() only affects possible help output.
257 MyClass &required(bool bRequired = true)
258 { setFlag(efOption_Required, bRequired); return me(); }
259 //! Allows the option to be specified multiple times.
260 MyClass &allowMultiple(bool bMulti = true)
261 { setFlag(efOption_MultipleTimes, bMulti); return me(); }
262 //! Requires exactly \p count values for the option.
263 MyClass &valueCount(int count) { setValueCount(count); return me(); }
264 //! Allows any number of values for the option.
265 MyClass &multiValue() { maxValueCount_ = -1; return me(); }
268 * Sets a default value for the option.
270 * \param[in] defaultValue Default value.
272 * If the option is never set, the default value is copied to the
273 * assigned storage. Note that if the option is not set and there
274 * is no default value, the storage is not altered, which can also be
275 * used to provide a default value. The latter method has to be used
276 * if the option can take multiple values.
278 * \p defaultValue is copied when the option is created.
280 MyClass &defaultValue(const T &defaultValue)
281 { defaultValue_ = &defaultValue; return me(); }
283 * Sets a default value for the option when it is set.
285 * \param[in] defaultValue Default value.
287 * This value is used if the option is set, but no value is provided.
288 * If the option is never set, the value set with defaultValue() is
289 * used. Can only be used for options that accept a single value.
291 * \p defaultValue is copied when the option is created.
293 MyClass &defaultValueIfSet(const T &defaultValue)
294 { defaultValueIfSet_ = &defaultValue; return me(); }
296 * Stores value(s) in memory pointed by \p store.
298 * \param[in] store Storage for option value(s).
300 * The caller is responsible for allocating enough memory such that
301 * the any allowed number of values fits into the array pointed by
302 * \p store. If there is no maximum allowed number or if the maximum
303 * is inconveniently large, storeVector() should be used.
305 * For information on when values are available in the storage, see
308 * The pointer provided should remain valid as long as the associated
309 * Options object exists.
311 MyClass &store(T *store)
312 { store_ = store; return me(); }
314 * Stores number of values in the value pointed by \p countptr.
316 * \param[in] countptr Storage for the number of values.
318 * For information on when values are available in the storage, see
321 * The pointers provided should remain valid as long as the associated
322 * Options object exists.
324 MyClass &storeCount(int *countptr)
325 { countptr_ = countptr; return me(); }
327 * Stores option values in the provided vector.
329 * \param[in] store Vector to store option values in.
331 * Values are added to the vector after each successful set of values
332 * is parsed. Note that for some options, the value may be changed
333 * later, and is only guaranteed to be correct after Options::finish()
336 * The pointer provided should remain valid as long as the associated
337 * Options object exists.
339 MyClass &storeVector(std::vector<T> *store)
340 { storeVector_ = store; return me(); }
344 //! Alias for the template class for use in base classes.
345 typedef OptionTemplate<T, U> MyBase;
347 //! Initializes the name and default values for an option.
348 explicit OptionTemplate(const char *name)
349 : AbstractOption(name),
350 defaultValue_(NULL), defaultValueIfSet_(NULL), store_(NULL),
351 countptr_(NULL), storeVector_(NULL)
355 * Returns a pointer to user-specified default value, or NULL if there
358 const T *defaultValue() const { return defaultValue_; }
360 * Returns a pointer to user-specified default value, or NULL if there
363 const T *defaultValueIfSet() const { return defaultValueIfSet_; }
364 //! Returns \p *this casted into MyClass to reduce typing.
365 MyClass &me() { return static_cast<MyClass &>(*this); }
369 const T *defaultValue_;
370 const T *defaultValueIfSet_;
373 std::vector<T> *storeVector_;
376 * Needed to initialize storage from this class without otherwise
377 * unnecessary accessors.
379 friend class OptionStorageTemplate<T>;
383 * Gives information and allows modifications to an option after creation.
385 * When an option is added with Options::addOption(), an object of a subclass
386 * of OptionInfo is returned. This object can be later used to access
387 * information about the option. Non-const methods also allow later changing
388 * (some of) the option settings provided at initialization time.
389 * The properties accessible/modifiable through this interface are implemented
390 * based on need, and may not be implemented for all cases.
393 * This class is also used by OptionsVisitor and OptionsModifyingVisitor as
394 * the interface that allows querying/modifying each visited option.
397 * This class isolates the details of the internal option implementation from
398 * callers. Although this class is a simple reference to the underlying
399 * implementation, it is implemented as non-copyable to allow const/non-const
400 * status of a reference to this class to indicate whether modifications are
401 * allowed. Otherwise, separate classes would be needed for access and
402 * modification, complicating the implementation. In the implementation,
403 * there is always a single OptionInfo instance referring to one option.
404 * The underlying implementation object always owns this instance, and only
405 * references are passed to callers.
407 * \see Options::addOption()
409 * \see OptionsVisitor
410 * \see OptionsModifyingVisitor
414 * \ingroup module_options
419 virtual ~OptionInfo();
422 * Test whether the option is of a particular type.
424 * \tparam InfoType Option type to test for. Should be a class derived
427 template <class InfoType>
430 return toType<InfoType>() != NULL;
433 * Convert the info object to a particular type if the type is correct.
435 * \tparam InfoType Option type to convert to. Should be a class
436 * derived from OptionInfo.
437 * \retval this converted to a pointer to \p InfoType, or NULL if the
438 * conversion is not possible.
440 template <class InfoType>
443 return dynamic_cast<InfoType *>(this);
445 //! \copydoc toType()
446 template <class InfoType>
447 const InfoType *toType() const
449 return dynamic_cast<const InfoType *>(this);
452 //! Returns true if the option has been set.
454 //! Returns true if the option is a hidden option.
455 bool isHidden() const;
456 //! Returns true if the option is required.
457 bool isRequired() const;
458 //! Returns the name of the option.
459 const std::string &name() const;
460 //! Returns the description of the option.
461 const std::string &description() const;
462 //! Returns the type of the option as a string.
463 const char *type() const;
464 //! Returns the number of values given for the option.
465 int valueCount() const;
466 //! Returns the i'th value of the option as a string.
467 std::string formatValue(int i) const;
469 * Returns the default value if set for the option as a string.
471 * \see OptionTemplate::defaultValueIfSet()
473 std::string formatDefaultValueIfSet() const;
478 * Wraps a given option object.
482 explicit OptionInfo(AbstractOptionStorage *option);
484 //! Returns the wrapped option storage object.
485 AbstractOptionStorage &option() { return option_; }
486 //! Returns the wrapped option storage object.
487 const AbstractOptionStorage &option() const { return option_; }
491 //! The wrapped option.
492 AbstractOptionStorage &option_;
494 GMX_DISALLOW_COPY_AND_ASSIGN(OptionInfo);