+/*
+ * This file is part of the GROMACS molecular simulation package.
+ *
+ * Copyright (c) 2014, by the GROMACS development team, led by
+ * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
+ * and including many others, as listed in the AUTHORS file in the
+ * top-level source directory and at http://www.gromacs.org.
+ *
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+/*! \libinternal \file
+ * \brief
+ * Declares gmx::OptionManagerContainer.
+ *
+ * \author Teemu Murtola <teemu.murtola@gmail.com>
+ * \inlibraryapi
+ * \ingroup module_options
+ */
+#ifndef GMX_OPTIONS_OPTIONMANAGERCONTAINER_H
+#define GMX_OPTIONS_OPTIONMANAGERCONTAINER_H
+
+#include <vector>
+
+#include "gromacs/utility/common.h"
+#include "gromacs/utility/gmxassert.h"
+
+namespace gmx
+{
+
+class OptionManagerInterface;
+
+/*! \libinternal
+ * \brief
+ * Container to keep managers added with Options::addManager() and pass them
+ * to options.
+ *
+ * Consistency of the managers (e.g., that there is at most one manager of a
+ * certain type) is only checked when the managers are accessed.
+ *
+ * \inlibraryapi
+ * \ingroup module_options
+ */
+class OptionManagerContainer
+{
+ public:
+ OptionManagerContainer()
+ {
+ }
+
+ //! Returns `true` if there are no managers.
+ bool empty() const { return list_.empty(); }
+
+ //! Adds a manager to the container.
+ void add(OptionManagerInterface *manager)
+ {
+ list_.push_back(manager);
+ }
+ /*! \brief
+ * Retrieves a manager of a certain type.
+ *
+ * \tparam ManagerType Type of manager to retrieve
+ * (should derive from OptionManagerInterface).
+ * \returns The manager, or `NULL` if there is none.
+ *
+ * This method is used in AbstractOption::createStorage() to retrieve
+ * a manager of a certain type for options that use a manager.
+ *
+ * The return value is `NULL` if there is no manager of the given type.
+ * The caller needs to handle this (either by asserting, or by handling
+ * the manager as optional).
+ */
+ template <class ManagerType>
+ ManagerType *get() const
+ {
+ ManagerType *result = NULL;
+ for (ListType::const_iterator i = list_.begin(); i != list_.end(); ++i)
+ {
+ ManagerType *curr = dynamic_cast<ManagerType *>(*i);
+ if (curr != NULL)
+ {
+ GMX_RELEASE_ASSERT(result == NULL,
+ "More than one applicable option manager is set");
+ result = curr;
+ }
+ }
+ return result;
+ }
+
+ private:
+ //! Shorthand for the internal container type.
+ typedef std::vector<OptionManagerInterface *> ListType;
+
+ ListType list_;
+
+ GMX_DISALLOW_COPY_AND_ASSIGN(OptionManagerContainer);
+};
+
+} // namespace gmx
+
+#endif