chain_pairing.h

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/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
 *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
 *    Author(s):       Hannah Schreiber
 *
 *    Copyright (C) 2022-24 Inria
 *
 *    Modification(s):
 *      - YYYY/MM Author: Description of the modification
 */
 
#ifndef PM_CHAIN_PAIRING_H
#define PM_CHAIN_PAIRING_H
 
#include <utility>  //std::move
 
namespace Gudhi {
namespace persistence_matrix {
 
struct Dummy_chain_pairing
{
  friend void swap([[maybe_unused]] Dummy_chain_pairing& d1, [[maybe_unused]] Dummy_chain_pairing& d2) {}
};
 
template <class Master_matrix>
class Chain_pairing 
{
 public:
  using Barcode = typename Master_matrix::Barcode;      
  using Dimension = typename Master_matrix::Dimension;  
  Chain_pairing();
  Chain_pairing(const Chain_pairing& matrixToCopy);
  Chain_pairing(Chain_pairing&& other) noexcept;
 
  const Barcode& get_current_barcode() const;
 
  Chain_pairing& operator=(Chain_pairing other);
  friend void swap(Chain_pairing& pairing1, Chain_pairing& pairing2) {
    pairing1.barcode_.swap(pairing2.barcode_);
    pairing1.indexToBar_.swap(pairing2.indexToBar_);
    std::swap(pairing1.nextPosition_, pairing2.nextPosition_);
  }
 
 protected:
  using Dictionary = typename Master_matrix::Bar_dictionary;
  using Pos_index = typename Master_matrix::Pos_index;
 
  Barcode barcode_;         
  Dictionary indexToBar_;   
  Pos_index nextPosition_;  
};
 
template <class Master_matrix>
inline Chain_pairing<Master_matrix>::Chain_pairing() : nextPosition_(0) 
{}
 
template <class Master_matrix>
inline Chain_pairing<Master_matrix>::Chain_pairing(const Chain_pairing& matrixToCopy)
    : barcode_(matrixToCopy.barcode_),
      indexToBar_(matrixToCopy.indexToBar_),
      nextPosition_(matrixToCopy.nextPosition_) 
{}
 
template <class Master_matrix>
inline Chain_pairing<Master_matrix>::Chain_pairing(Chain_pairing<Master_matrix>&& other) noexcept
    : barcode_(std::move(other.barcode_)),
      indexToBar_(std::move(other.indexToBar_)),
      nextPosition_(std::exchange(other.nextPosition_, 0)) 
{}
 
template <class Master_matrix>
inline const typename Chain_pairing<Master_matrix>::Barcode& Chain_pairing<Master_matrix>::get_current_barcode()
    const 
{
  return barcode_;
}
 
template <class Master_matrix>
inline Chain_pairing<Master_matrix>& Chain_pairing<Master_matrix>::operator=(Chain_pairing<Master_matrix> other) 
{
  barcode_.swap(other.barcode_);
  indexToBar_.swap(other.indexToBar_);
  std::swap(nextPosition_, other.nextPosition_);
  return *this;
}
 
}  // namespace persistence_matrix
}  // namespace Gudhi
 
#endif  // PM_CHAIN_PAIRING_H