src/gromacs/options/abstractsection.h

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  35 /*! \file
  36  * \brief
  37  * Declares base classes for declaring option sections.
  38  *
  39  * This header defines base classes for option section settings that are used
  40  * with IOptionsContainerWithSections::addSection().  These classes implement
  41  * the "named parameter" idiom for specifying section properties.
  42  *
  43  * \author Teemu Murtola <teemu.murtola@gmail.com>
  44  * \ingroup module_options
  45  */
  46 #ifndef GMX_OPTIONS_ABSTRACTSECTION_H
  47 #define GMX_OPTIONS_ABSTRACTSECTION_H
  48
  49 #include "gromacs/options/ioptionscontainerwithsections.h"
  50 #include "gromacs/options/isectionstorage.h"
  51 #include "gromacs/utility/classhelpers.h"
  52 #include "gromacs/utility/gmxassert.h"
  53
  54 namespace gmx
  55 {
  56
  57 class IOptionSectionStorage;
  58
  59 namespace internal
  60 {
  61 class OptionSectionImpl;
  62 }
  63
  64 /*! \brief
  65  * Base class for specifying option section properties.
  66  *
  67  * \ingroup module_options
  68  */
  69 class AbstractOptionSection
  70 {
  71     protected:
  72         //! \cond libapi
  73         //! Initializes option properties with the given name.
  74         explicit AbstractOptionSection(const char *name) : name_(name) {}
  75
  76         /*! \brief
  77          * Creates a storage object corresponding to this section.
  78          *
  79          * Similar to AbstractOption::createStorage().
  80          */
  81         virtual IOptionSectionStorage *createStorage() const = 0;
  82         //! \endcond
  83
  84     private:
  85         const char *name_;
  86
  87         friend class internal::OptionSectionImpl;
  88 };
  89
  90 /*! \brief
  91  * Base class for handles to option sections.
  92  *
  93  * This class implements the common functionality for adding options and
  94  * subsections to option sections.
  95  *
  96  * \ingroup module_options
  97  */
  98 class AbstractOptionSectionHandle : public IOptionsContainerWithSections
  99 {
 100     public:
 101         // From IOptionsContainer
 102         //! \copydoc IOptionsContainer::addGroup()
 103         virtual IOptionsContainer &addGroup();
 104
 105     protected:
 106         //! \cond libapi
 107         /*! \brief
 108          * Returns the storage for a particular type of section.
 109          *
 110          * This is intended for use in derived class constructors, where the
 111          * handle needs access to the actual storage.  The handle should know
 112          * the type of storage created for the section type it deals with, so
 113          * the cast should always be successful.
 114          */
 115         template <typename StorageType>
 116         static StorageType *getStorage(internal::OptionSectionImpl *section)
 117         {
 118             IOptionSectionStorage *storage = getStorage(section);
 119             StorageType           *typedStorage
 120                 = dynamic_cast<StorageType *>(storage);
 121             GMX_ASSERT(typedStorage != nullptr, "Mismatching section storage type");
 122             return typedStorage;
 123         }
 124
 125         //! Wraps a given section storage object.
 126         explicit AbstractOptionSectionHandle(internal::OptionSectionImpl *section)
 127             : section_(section)
 128         {
 129         }
 130         //! \endcond
 131
 132     private:
 133         // From IOptionsContainerWithSections
 134         virtual internal::OptionSectionImpl *
 135         addSectionImpl(const AbstractOptionSection &section);
 136         // From IOptionsContainer
 137         virtual OptionInfo *addOptionImpl(const AbstractOption &settings);
 138
 139         /*! \brief
 140          * Implementation helper for the template method.
 141          *
 142          * This allows encapsulating the implementation within the source file.
 143          */
 144         static IOptionSectionStorage *getStorage(internal::OptionSectionImpl *section);
 145
 146         internal::OptionSectionImpl *section_;
 147 };
 148
 149 class AbstractOptionSectionInfo
 150 {
 151     public:
 152         //! Wraps a given section storage object.
 153         explicit AbstractOptionSectionInfo(internal::OptionSectionImpl *section)
 154             : section_(*section)
 155         {
 156         }
 157
 158         //! Returns the name of the section.
 159         const std::string &name() const;
 160
 161         //! Returns the wrapped section storage object.
 162         internal::OptionSectionImpl       &section() { return section_; }
 163         //! Returns the wrapped section storage object.
 164         const internal::OptionSectionImpl &section() const { return section_; }
 165
 166     private:
 167         internal::OptionSectionImpl &section_;
 168
 169         GMX_DISALLOW_COPY_AND_ASSIGN(AbstractOptionSectionInfo);
 170 };
 171
 172 } // namespace gmx
 173
 174 #endif