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36 /*! \libinternal \file
38 * Declares gmx::OptionsAssigner.
40 * This header is only needed when implementing option parsers.
42 * \author Teemu Murtola <teemu.murtola@gmail.com>
44 * \ingroup module_options
46 #ifndef GMX_OPTIONS_OPTIONSASSIGNER_H
47 #define GMX_OPTIONS_OPTIONSASSIGNER_H
51 #include "gromacs/utility/classhelpers.h"
59 /*! \libinternal \brief
60 * Decorator class for assigning values to Options.
62 * This class extends the interface of an Options object by providing methods
63 * to set values for options. It also keeps track of necessary state variables
64 * to assign values to options in subsections within the Options object.
65 * Typical use (without error handling):
67 gmx::Options options("name", "Title");
70 gmx::OptionsAssigner assigner(&options);
72 assigner.startOption("opt1");
73 assigner.appendValue("3");
74 assigner.finishOption();
75 assigner.startSection("section");
76 assigner.startOption("opt2"); // Now in the subsection
77 assigner.appendValue("yes");
78 assigner.finishOption();
79 assigner.finishSection()
80 assigner.startOption("opt3"); // Again in the main options
81 assigner.appendValue("2");
82 assigner.finishOption();
87 * \ingroup module_options
93 * Creates an object that assigns to the given object.
95 explicit OptionsAssigner(Options* options);
99 * Sets the assigner to recognize boolean options with a "no" prefix.
101 * With this option set, \c startOption("noname") is interpreted as
102 * \c startOption("name") followed by \c appendValue("no"), if there is
103 * no option by the name "noname", but there is a boolean option with
106 * By default, the prefix is not recognized.
108 * Can be set or cleared at any time, and will have effect on all
109 * subsequent calls of startOption().
113 void setAcceptBooleanNoPrefix(bool bEnabled);
116 * Starts assigning values.
122 * Starts assigning values to options in a subsection.
124 * \param[in] name Name of the subsection to start assigning to.
125 * \throws InvalidInputError if such a subsection is not found.
127 * Strong exception safety guarantee.
129 void startSection(const char* name);
131 * Starts assigning values for an option.
133 * \param[in] name Name of the option to start assigning to.
134 * \throws InvalidInputError if such an option is not found, or if the
135 * option is specified more than once but doesn't support it.
137 void startOption(const char* name);
139 * Starts assigning values for an option.
141 * \param[in] name Name of the option to start assigning to.
142 * \returns true if \p name is a valid option name.
143 * \throws InvalidInputError if the option is specified more than once
144 * but doesn't support it.
146 bool tryStartOption(const char* name);
148 * Appends a value to the value list of the current option.
150 * \param[in] value Value to assign.
151 * \throws InvalidInputError if the value cannot be converted or if
152 * there are too many values for an option.
154 * Basic exception safety guarantee:
155 * If this method throws, erroneous values are ignored, but it is
156 * possible to continue assigning values to the same option. However,
157 * if \p value would result in more than one value, and some of them
158 * can be converted, but some result in errors, it is currently
159 * possible that some values have been added to the option even if an
160 * exception is thrown.
162 * Strong exception safety guarantee if the option provides value
163 * conversion with the same guarantee. All options where a single
164 * input value always results in a single output value provide this.
167 * This method provides the same exception safety guarantee as the
168 * OptionStorageTemplate::convertValue() method of the storage class
169 * implementing the option where the value is assigned to.
171 void appendValue(const Any& value);
173 * Appends a value to the value list of the current option.
175 * \param[in] value Value to assign.
177 * See appendValue(const Any &) for more details.
179 void appendValue(const std::string& value);
181 * Finish assigning values for the current option.
183 * \throws InvalidInputError if the set of values since startOption()
186 * If this method throws, it returns to the state where the option was
187 * before startOption(), i.e., all values added with appendValue()
188 * since the last startOption() are discarded.
190 * Independent of whether the method throws, the option opened with
191 * startOption() will be closed after the call.
195 * Finish assigning values to a subsection.
199 void finishSection();
201 * Finish assigning options through the object.
210 PrivateImplPointer<Impl> impl_;