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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;
125 //! Sets the description for the option.
126 void setDescription(const char *descr) { descr_ = descr; }
127 //! Sets a flag for the option.
128 void setFlag(OptionFlag flag) { flags_.set(flag); }
129 //! Clears a flag for the option.
130 void clearFlag(OptionFlag flag) { flags_.clear(flag); }
131 //! Sets or clears a flag for the option.
132 void setFlag(OptionFlag flag, bool bSet) { flags_.set(flag, bSet); }
133 //! Returns true if the option is vector-valued.
134 bool isVector() const { return hasFlag(efOption_Vector); }
136 * Sets the option to be vector-valued.
138 * This method is provided for convenience to make management of value
139 * counts easier. In order to implement a vector-valued option, the
140 * class derived from AbstractOption should expose a method that calls
141 * this method, and the storage object derived from
142 * AbstractOptionStorage should check isVector().
143 * If only a single value is provided, the storage object should fill
144 * the whole vector with that value.
146 * The length of the vector (the value of maxValueCount_) must be
147 * fixed. The default length is 3 elements.
151 setFlag(efOption_Vector);
153 if (maxValueCount_ == 1)
158 //! Sets the required number of values for the option.
159 void setValueCount(int count)
161 if (!hasFlag(efOption_Vector))
163 minValueCount_ = count;
165 maxValueCount_ = count;
168 //! Minimum number of values required for the option.
170 //! Maximum number of values allowed for the option.
175 //! Returns true if a flag has been set.
176 bool hasFlag(OptionFlag flag) const { return flags_.test(flag); }
179 //! Pointer to description of the option.
184 * Needed to initialize an AbstractOptionStorage object from this class
185 * without otherwise unnecessary accessors.
187 friend class AbstractOptionStorage;
189 * Needed to be able to call createStorage().
191 friend class Options;
195 * Templated base class for constructing concrete option settings classes.
197 * \tparam T Assignable type that stores a single option value.
198 * \tparam U Type of the derived class.
200 * This template is used as a base class like this:
202 class ConcreteOption : public OptionTemplate<int, ConcreteOption>
206 * All public functions in this class return \c *this casted to a reference to
207 * \p U. They do not throw.
209 * For examples of how to use classes derived from this class, see the class
210 * documentation for Options.
213 * \ingroup module_options
215 template <typename T, class U>
216 class OptionTemplate : public AbstractOption
219 //! Type that stores a single option value.
221 //! Alias for the derived class type.
225 * Sets a description for the option.
227 * \param[in] descr Description to set.
229 * String in \p descr is copied when the option is created.
231 MyClass &description(const char *descr)
232 { setDescription(descr); return me(); }
233 //! Hides the option from normal help output.
234 MyClass &hidden(bool bHidden = true)
235 { setFlag(efOption_Hidden, bHidden); return me(); }
237 * Requires the option to be specified explicitly.
239 * Note that if you specify defaultValue() together with required(),
240 * the user is not required to explicitly provide the option.
241 * In this case, required() only affects possible help output.
243 MyClass &required(bool bRequired = true)
244 { setFlag(efOption_Required, bRequired); return me(); }
245 //! Allows the option to be specified multiple times.
246 MyClass &allowMultiple(bool bMulti = true)
247 { setFlag(efOption_MultipleTimes, bMulti); return me(); }
248 //! Requires exactly \p count values for the option.
249 MyClass &valueCount(int count) { setValueCount(count); return me(); }
250 //! Allows any number of values for the option.
251 MyClass &multiValue() { maxValueCount_ = -1; return me(); }
254 * Sets a default value for the option.
256 * \param[in] defaultValue Default value.
258 * If the option is never set, the default value is copied to the
259 * assigned storage. Note that if the option is not set and there
260 * is no default value, the storage is not altered, which can also be
261 * used to provide a default value. The latter method has to be used
262 * if the option can take multiple values.
264 * \p defaultValue is copied when the option is created.
266 MyClass &defaultValue(const T &defaultValue)
267 { defaultValue_ = &defaultValue; return me(); }
269 * Sets a default value for the option when it is set.
271 * \param[in] defaultValue Default value.
273 * This value is used if the option is set, but no value is provided.
274 * If the option is never set, the value set with defaultValue() is
275 * used. Can only be used for options that accept a single value.
277 * \p defaultValue is copied when the option is created.
279 MyClass &defaultValueIfSet(const T &defaultValue)
280 { defaultValueIfSet_ = &defaultValue; return me(); }
282 * Stores value(s) in memory pointed by \p store.
284 * \param[in] store Storage for option value(s).
286 * The caller is responsible for allocating enough memory such that
287 * the any allowed number of values fits into the array pointed by
288 * \p store. If there is no maximum allowed number or if the maximum
289 * is inconveniently large, storeVector() should be used.
291 * For information on when values are available in the storage, see
294 * The pointer provided should remain valid as long as the associated
295 * Options object exists.
297 MyClass &store(T *store)
298 { store_ = store; return me(); }
300 * Stores number of values in the value pointed by \p countptr.
302 * \param[in] countptr Storage for the number of values.
304 * For information on when values are available in the storage, see
307 * The pointers provided should remain valid as long as the associated
308 * Options object exists.
310 MyClass &storeCount(int *countptr)
311 { countptr_ = countptr; return me(); }
313 * Stores option values in the provided vector.
315 * \param[in] store Vector to store option values in.
317 * Values are added to the vector after each successful set of values
318 * is parsed. Note that for some options, the value may be changed
319 * later, and is only guaranteed to be correct after Options::finish()
322 * The pointer provided should remain valid as long as the associated
323 * Options object exists.
325 MyClass &storeVector(std::vector<T> *store)
326 { storeVector_ = store; return me(); }
330 //! Alias for the template class for use in base classes.
331 typedef OptionTemplate<T, U> MyBase;
333 //! Initializes the name and default values for an option.
334 explicit OptionTemplate(const char *name)
335 : AbstractOption(name),
336 defaultValue_(NULL), defaultValueIfSet_(NULL), store_(NULL),
337 countptr_(NULL), storeVector_(NULL)
341 * Returns a pointer to user-specified default value, or NULL if there
344 const T *defaultValue() const { return defaultValue_; }
346 * Returns a pointer to user-specified default value, or NULL if there
349 const T *defaultValueIfSet() const { return defaultValueIfSet_; }
350 //! Returns \p *this casted into MyClass to reduce typing.
351 MyClass &me() { return static_cast<MyClass &>(*this); }
355 const T *defaultValue_;
356 const T *defaultValueIfSet_;
359 std::vector<T> *storeVector_;
362 * Needed to initialize storage from this class without otherwise
363 * unnecessary accessors.
365 friend class OptionStorageTemplate<T>;
369 * Gives information and allows modifications to an option after creation.
371 * When an option is added with Options::addOption(), an object of a subclass
372 * of OptionInfo is returned. This object can be later used to access
373 * information about the option. Non-const methods also allow later changing
374 * (some of) the option settings provided at initialization time.
375 * The properties accessible/modifiable through this interface are implemented
376 * based on need, and may not be implemented for all cases.
379 * This class is also used by OptionsVisitor and OptionsModifyingVisitor as
380 * the interface that allows querying/modifying each visited option.
383 * This class isolates the details of the internal option implementation from
384 * callers. Although this class is a simple reference to the underlying
385 * implementation, it is implemented as non-copyable to allow const/non-const
386 * status of a reference to this class to indicate whether modifications are
387 * allowed. Otherwise, separate classes would be needed for access and
388 * modification, complicating the implementation. In the implementation,
389 * there is always a single OptionInfo instance referring to one option.
390 * The underlying implementation object always owns this instance, and only
391 * references are passed to callers.
393 * \see Options::addOption()
395 * \see OptionsVisitor
396 * \see OptionsModifyingVisitor
400 * \ingroup module_options
405 virtual ~OptionInfo();
408 * Test whether the option is of a particular type.
410 * \tparam InfoType Option type to test for. Should be a class derived
413 template <class InfoType>
416 return toType<InfoType>() != NULL;
419 * Convert the info object to a particular type if the type is correct.
421 * \tparam InfoType Option type to convert to. Should be a class
422 * derived from OptionInfo.
423 * \retval this converted to a pointer to \p InfoType, or NULL if the
424 * conversion is not possible.
426 template <class InfoType>
429 return dynamic_cast<InfoType *>(this);
431 //! \copydoc toType()
432 template <class InfoType>
433 const InfoType *toType() const
435 return dynamic_cast<const InfoType *>(this);
438 //! Returns true if the option has been set.
440 //! Returns true if the option is a hidden option.
441 bool isHidden() const;
442 //! Returns true if the option is required.
443 bool isRequired() const;
444 //! Returns the minimum number of values that this option accepts.
445 int minValueCount() const;
446 //! Returns the maximum number of values that this option accepts.
447 int maxValueCount() const;
448 //! Returns the name of the option.
449 const std::string &name() const;
450 //! Returns the type of the option as a string.
451 std::string type() const;
452 //! Returns the description of the option.
453 std::string formatDescription() const;
455 * Returns the default value if set for the option as a string.
457 * \see OptionTemplate::defaultValueIfSet()
459 std::string formatDefaultValueIfSet() const;
461 //! Returns the number of values given for the option.
462 int valueCount() const;
463 //! Returns the i'th value of the option as a string.
464 std::string formatValue(int i) const;
469 * Wraps a given option object.
473 explicit OptionInfo(AbstractOptionStorage *option);
475 //! Returns the wrapped option storage object.
476 AbstractOptionStorage &option() { return option_; }
477 //! Returns the wrapped option storage object.
478 const AbstractOptionStorage &option() const { return option_; }
482 //! The wrapped option.
483 AbstractOptionStorage &option_;
485 GMX_DISALLOW_COPY_AND_ASSIGN(OptionInfo);