// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2016, Knut Reinert, FU Berlin
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
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//     * Neither the name of Knut Reinert or the FU Berlin nor the names of
//       its contributors may be used to endorse or promote products derived
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//
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//
// ==========================================================================
// Author: Rene Rahn <rene.rahn@fu-berlin.de>
// ==========================================================================
// Implements the DPCell for linear gap cost functions. This requires only
// one matrix, such that we only need to store one score value per matrix
// entry.
// ==========================================================================

#ifndef SEQAN_INCLUDE_SEQAN_ALIGN_DP_CELL_LINEAR_H_
#define SEQAN_INCLUDE_SEQAN_ALIGN_DP_CELL_LINEAR_H_

namespace seqan {

// ============================================================================
// Forwards
// ============================================================================

// ============================================================================
// Tags, Classes, Enums
// ============================================================================


// ----------------------------------------------------------------------------
// Class DPCell                                                    [LinearGaps]
// ----------------------------------------------------------------------------

// The specialization for linear gap cost function.
// It solely stores the maximal score.
template <typename TScoreValue>
class DPCell_<TScoreValue, LinearGaps>
{
public:
    TScoreValue _score = DPCellDefaultInfinity<DPCell_>::VALUE;

    DPCell_() = default;
    
    // Copy c'tor.
    DPCell_(DPCell_ const & other) : _score(other._score)
    {}
    
    // Move c'tor.
    DPCell_(DPCell_ && other) : DPCell_()
    {
        swap(*this, other);
    }
    
    // Assignment & move operator
    DPCell_& operator=(DPCell_ other)
    {
        swap(*this, other);
        return *this;
    }

    // Assignment of score.
    DPCell_ &
    operator=(TScoreValue const & score)
    {
        _score = score;
        return *this;
    }

    ~DPCell_() = default;
};

// ============================================================================
// Metafunctions
// ============================================================================

// ============================================================================
// Functions
// ============================================================================

// ----------------------------------------------------------------------------
// Function operator<()
// ----------------------------------------------------------------------------

// Needed for banded chain alignment for the std::set.
template <typename TScoreValueLeft, typename TScoreValueRight>
inline bool operator<(DPCell_<TScoreValueLeft, LinearGaps> const & left,
                      DPCell_<TScoreValueRight, LinearGaps> const & right)
{
    return left._score < right._score;
}

template <typename TScoreValue>
inline void 
swap(DPCell_<TScoreValue, LinearGaps> & lhs, 
     DPCell_<TScoreValue, LinearGaps> & rhs)
{
    std::swap(lhs._score, rhs._score);
}

}  // namespace seqan

#endif  // #ifndef SEQAN_INCLUDE_SEQAN_ALIGN_DP_CELL_LINEAR_H_
