src/gromacs/options/optionmanagercontainer.h

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  35 /*! \libinternal \file
  36  * \brief
  37  * Declares gmx::OptionManagerContainer.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inlibraryapi
  41  * \ingroup module_options
  42  */
  43 #ifndef GMX_OPTIONS_OPTIONMANAGERCONTAINER_H
  44 #define GMX_OPTIONS_OPTIONMANAGERCONTAINER_H
  45
  46 #include <vector>
  47
  48 #include "gromacs/utility/classhelpers.h"
  49 #include "gromacs/utility/gmxassert.h"
  50
  51 namespace gmx
  52 {
  53
  54 class IOptionManager;
  55
  56 /*! \libinternal
  57  * \brief
  58  * Container to keep managers added with Options::addManager() and pass them
  59  * to options.
  60  *
  61  * Consistency of the managers (e.g., that there is at most one manager of a
  62  * certain type) is only checked when the managers are accessed.
  63  *
  64  * \inlibraryapi
  65  * \ingroup module_options
  66  */
  67 class OptionManagerContainer
  68 {
  69 public:
  70     OptionManagerContainer() {}
  71
  72     //! Returns `true` if there are no managers.
  73     bool empty() const { return list_.empty(); }
  74
  75     //! Adds a manager to the container.
  76     void add(IOptionManager* manager) { list_.push_back(manager); }
  77     /*! \brief
  78      * Retrieves a manager of a certain type.
  79      *
  80      * \tparam  ManagerType  Type of manager to retrieve
  81      *     (should derive from IOptionManager).
  82      * \returns The manager, or `NULL` if there is none.
  83      *
  84      * This method is used in AbstractOption::createStorage() to retrieve
  85      * a manager of a certain type for options that use a manager.
  86      *
  87      * The return value is `NULL` if there is no manager of the given type.
  88      * The caller needs to handle this (either by asserting, or by handling
  89      * the manager as optional).
  90      */
  91     template<class ManagerType>
  92     ManagerType* get() const
  93     {
  94         ManagerType* result = nullptr;
  95         for (ListType::const_iterator i = list_.begin(); i != list_.end(); ++i)
  96         {
  97             ManagerType* curr = dynamic_cast<ManagerType*>(*i);
  98             if (curr != nullptr)
  99             {
 100                 GMX_RELEASE_ASSERT(result == nullptr,
 101                                    "More than one applicable option manager is set");
 102                 result = curr;
 103             }
 104         }
 105         return result;
 106     }
 107
 108 private:
 109     //! Shorthand for the internal container type.
 110     typedef std::vector<IOptionManager*> ListType;
 111
 112     ListType list_;
 113
 114     GMX_DISALLOW_COPY_AND_ASSIGN(OptionManagerContainer);
 115 };
 116
 117 } // namespace gmx
 118
 119 #endif