IItemConnectivityAccessor.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
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/* IItemConnectivityAccessor.h                                 (C) 2000-2025 */
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/* Interface for entity connectivity accessors.                              */
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#ifndef ARCANE_CORE_IITEMCONNECTIVITYACCESSOR_H
#define ARCANE_CORE_IITEMCONNECTIVITYACCESSOR_H
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#include "arcane/utils/ArrayView.h"
#include "arcane/utils/String.h"
 
#include "arcane/core/ItemTypes.h"
 
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namespace Arcane
{
 
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/*!
 * \brief Interface to manage access to a connectivity.
 */
class ARCANE_CORE_EXPORT IItemConnectivityAccessor
{
  friend ConnectivityItemVector;
 
 public:
 
  virtual ~IItemConnectivityAccessor() = default;
 
 public:
 
  //! Number of entities connected to the source entity with local ID \a lid
  virtual Integer nbConnectedItem(ItemLocalId lid) const = 0;
 
  //! localId() of the \a index-th entity connected to the source entity with local ID \a lid
  virtual Int32 connectedItemLocalId(ItemLocalId lid, Integer index) const = 0;
 
 protected:
 
  //! Implements the initialization of \a civ for this connectivity.
  virtual void _initializeStorage(ConnectivityItemVector* civ) = 0;
 
  //! Fills \a con_items with the entities connected to \a item.
  virtual ItemVectorView _connectedItems(ItemLocalId item, ConnectivityItemVector& con_items) const = 0;
};
 
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} // namespace Arcane
 
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#endif