/usr/include/gromacs/options/repeatingsection.h is in libgromacs-dev 2018.1-1.
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* This file is part of the GROMACS molecular simulation package.
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* Copyright (c) 2016, 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
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/*! \file
* \brief
* Declares gmx::RepeatingOptionSection and related classes.
*
* \author Teemu Murtola <teemu.murtola@gmail.com>
* \inpublicapi
* \ingroup module_options
*/
#ifndef GMX_OPTIONS_REPEATINGSECTION_H
#define GMX_OPTIONS_REPEATINGSECTION_H
#include <memory>
#include <vector>
#include "gromacs/options/abstractsection.h"
#include "gromacs/options/ioptionscontainerwithsections.h"
#include "gromacs/options/isectionstorage.h"
#include "gromacs/options/valuestore.h"
namespace gmx
{
template <class T> class RepeatingOptionSectionHandle;
template <class T> class RepeatingOptionSectionStorage;
/*! \brief
* Declares an option section that creates a structure for each instance.
*
* \tparam T Structure that stores the values for an instance of the section.
*
* This class declares a section that can be specified multiple times, and
* creates an instance of `T` for each instance. Options within the section
* can store their values in the created structure.
*
* \inpublicapi
* \ingroup module_options
*/
template <class T>
class RepeatingOptionSection : public AbstractOptionSection
{
public:
//! AbstractOptionSectionHandle corresponding to this option type.
typedef RepeatingOptionSectionHandle<T> HandleType;
//! Creates a section with the given name.
explicit RepeatingOptionSection(const char *name)
: AbstractOptionSection(name), values_(nullptr)
{
}
//! Specifies a vector to receive the section structures.
RepeatingOptionSection &storeVector(std::vector<T> *values)
{
values_ = values;
return *this;
}
private:
virtual IOptionSectionStorage *createStorage() const;
std::vector<T> *values_;
//! Allows accessing the properties when initializing the storage.
friend class RepeatingOptionSectionStorage<T>;
};
/*! \internal
* \brief
* Implements handling of the structures that stores per-section values.
*
* \ingroup module_options
*/
template <class T>
class RepeatingOptionSectionStorage : public IOptionSectionStorage
{
public:
//! Initializes the storage for given section properties.
explicit RepeatingOptionSectionStorage(const RepeatingOptionSection<T> §ion)
: store_(new OptionValueStoreVector<T>(section.values_)), currentData_()
{
}
virtual void initStorage()
{
defaultValues_ = currentData_;
}
virtual void startSection()
{
resetSection();
}
virtual void finishSection()
{
store_->append(currentData_);
resetSection();
}
private:
void resetSection()
{
currentData_ = defaultValues_;
}
//! Final storage location for the section structures.
const std::unique_ptr<IOptionValueStore<T> > store_;
T defaultValues_;
/*! \brief
* Stores the values for the current in-process section.
*
* Options within the section store their values to this structure, and
* they are then copied to the final storage when the section finishes.
*/
T currentData_;
//! Allows binding option storage to the current section data structure.
friend class RepeatingOptionSectionHandle<T>;
};
template <class T>
IOptionSectionStorage *RepeatingOptionSection<T>::createStorage() const
{
return new RepeatingOptionSectionStorage<T>(*this);
}
/*! \brief
* Allows adding options to an RepeatingOptionSection.
*
* An instance of this class is returned from
* IOptionsContainerWithSections::addSection(), and supports adding options and
* subsections to a section created with OptionSection.
*
* Example:
* \code
struct SectionData { int value; }
// as class attribute
std::vector<SectionData> values;
void MyClass::initOptions(gmx::IOptionsContainerWithSections *options)
{
auto sec = options->addSection(gmx::RepeatingOptionSection<SectionData>("sec").storeVector(&values));
sec->addOption(gmx::IntegerOption("arg").store(&sec.bind().value));
}
\endcode
*
* \inpublicapi
* \ingroup module_options
*/
template <class T>
class RepeatingOptionSectionHandle : public AbstractOptionSectionHandle
{
public:
//! Wraps a given section storage object.
explicit RepeatingOptionSectionHandle(internal::OptionSectionImpl *section)
: AbstractOptionSectionHandle(section),
storage_(getStorage<RepeatingOptionSectionStorage<T> >(section))
{
}
/*! \brief
* Supports storing option values within the per-section data structure.
*
* See class documentation for an example.
*/
T &bind()
{
return storage_->currentData_;
}
private:
RepeatingOptionSectionStorage<T> *storage_;
};
} // namespace gmx
#endif
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