VariableScalar.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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/* VariableScalar.h                                            (C) 2000-2025 */
/*                                                                           */
/* Scalar variable.                                                          */
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#ifndef ARCANE_CORE_VARIABLESCALAR_H
#define ARCANE_CORE_VARIABLESCALAR_H
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#include "arcane/core/Variable.h"
 
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namespace Arcane
{
 
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/*!
 * \internal
 * \brief Scalar variable.
 */
template <class T>
class VariableScalarT
: public Variable
{
 public:
 
  typedef T ValueType;
  typedef IScalarDataT<T> ValueDataType;
  typedef VariableScalarT<T> ThatClass;
  typedef Variable BaseClass;
 
 protected:
 
  //! Constructs a variable based on the reference \a v
  VariableScalarT(const VariableBuildInfo& v, const VariableInfo& vi);
 
 public:
 
  static ARCANE_CORE_EXPORT ThatClass* getReference(const VariableBuildInfo& v, const VariableInfo& vi);
  static ARCANE_CORE_EXPORT ThatClass* getReference(IVariable* var);
 
 public:
 
  void synchronize() override;
  void synchronize(Int32ConstArrayView local_ids) override;
  Real allocatedMemory() const override;
  Integer nbElement() const override { return 1; }
  ValueType& value() { return m_value->value(); }
  void shrinkMemory() override {}
  void print(std::ostream& o) const override;
  IData* data() override { return m_value; }
  const IData* data() const override { return m_value; }
 
 public:
 
  void copyItemsValues(Int32ConstArrayView source, Int32ConstArrayView destination) override;
  void copyItemsMeanValues(Int32ConstArrayView first_source,
                           Int32ConstArrayView second_source,
                           Int32ConstArrayView destination) override;
  void compact(Int32ConstArrayView new_to_old_ids) override;
  void setIsSynchronized() override;
  void setIsSynchronized(const ItemGroup& item_group) override;
 
 public:
 
  ARCANE_CORE_EXPORT void swapValues(ThatClass& rhs);
 
 protected:
 
  void _internalResize(const VariableResizeArgs& resize_args) override
  {
    ARCANE_UNUSED(resize_args);
  }
  VariableComparerResults _compareVariable(const VariableComparerArgs& compare_args) final;
 
 private:
 
  ValueDataType* m_value;
};
 
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} // End namespace Arcane
 
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#endif