/*

  This file is part of solidity.

  solidity is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  solidity is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with solidity.  If not, see <http://www.gnu.org/licenses/>.

*/

// SPDX-License-Identifier: GPL-3.0

#pragma once

#include <memory>

namespace solidity::frontend::smt

{

/**

 * This class represents the SSA representation of a program variable.

 */

class SSAVariable

{

public:

  SSAVariable();

  /// Resets index to 0 and next index to 1.

  void resetIndex();

  /// Sets index to _index and only adjusts next if next <= _index.

  void setIndex(unsigned _index);

  /// This function returns the current index of this SSA variable.

  unsigned index() const { return m_currentIndex; }

  unsigned& index() { return m_currentIndex; }

  unsigned operator++()

  {

    return m_currentIndex = m_nextFreeIndex++;

  }

private:

  unsigned m_currentIndex;

  unsigned m_nextFreeIndex;

};

}