/*
 * This file is part of the GROMACS molecular simulation package.
 *
 * Copyright 2015- The GROMACS Authors
 * and the project initiators Erik Lindahl, Berk Hess and David van der Spoel.
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/*! \internal \file
 *
 * \brief
 * Contains datatypes and function declarations needed by AWH to
 * have its force correlation data checkpointed.
 *
 * \author Viveca Lindahl
 * \author Berk Hess <hess@kth.se>
 * \ingroup module_awh
 */

#ifndef GMX_AWH_CORRELATIONHISTORY_H
#define GMX_AWH_CORRELATIONHISTORY_H

struct t_commrec;

namespace gmx
{
class CorrelationGrid;
struct CorrelationGridHistory;

/*! \brief
 * Allocate a correlation grid history with the same structure as the given correlation grid.
 *
 * This function would be called at the start of a new simulation.
 * Note that only sizes and memory are initialized here.
 * History data is set by \ref updateCorrelationGridHistory.
 *
 * \param[in,out] corrGrid      Correlation grid state to initialize with.
 * \returns the correlation grid history struct.
 */
CorrelationGridHistory initCorrelationGridHistoryFromState(const CorrelationGrid& corrGrid);

/*! \brief
 * Restores the correlation grid state from the correlation grid history.
 *
 * \param[in] corrGridHist  Correlation grid history to read.
 * \param[in,out] corrGrid  Correlation grid state to set.
 */
void restoreCorrelationGridStateFromHistory(const CorrelationGridHistory& corrGridHist,
                                            CorrelationGrid*              corrGrid);

/*! \brief
 * Update the correlation grid history for checkpointing.
 *
 * \param[in,out] corrGridHist  Correlation grid history to set.
 * \param[in]     corrGrid      Correlation grid state to read.
 */
void updateCorrelationGridHistory(CorrelationGridHistory* corrGridHist, const CorrelationGrid& corrGrid);

} // namespace gmx

#endif /* GMX_AWH_CORRELATIONHISTORY_H */
