text: // Copyright (C) 2019 by Pedro Mendes, Rector and Visitors of the
  // University of Virginia, University of Heidelberg, and University
  // of Connecticut School of Medicine.
  // All rights reserved.
  
  // Copyright (C) 2017 - 2018 by Pedro Mendes, Virginia Tech Intellectual
  // Properties, Inc., University of Heidelberg, and University of
  // of Connecticut School of Medicine.
  // All rights reserved.
  
  // Copyright (C) 2010 - 2016 by Pedro Mendes, Virginia Tech Intellectual
  // Properties, Inc., University of Heidelberg, and The University
  // of Manchester.
  // All rights reserved.
  
  // Copyright (C) 2008 - 2009 by Pedro Mendes, Virginia Tech Intellectual
  // Properties, Inc., EML Research, gGmbH, University of Heidelberg,
  // and The University of Manchester.
  // All rights reserved.
  
  // Copyright (C) 2005 - 2007 by Pedro Mendes, Virginia Tech Intellectual
  // Properties, Inc. and EML Research, gGmbH.
  // All rights reserved.
  
  #ifndef COPASI_CEvaluationNodeVariable
  #define COPASI_CEvaluationNodeVariable
  
  #include "copasi/copasi.h"
  LIBSBML_CPP_NAMESPACE_BEGIN
  class ASTNode;
  LIBSBML_CPP_NAMESPACE_END
  class CDataModel;
  
  /**
   * This is class for nodes presenting numbers used in an evaluation trees
   */
  class CEvaluationNodeVariable : public CEvaluationNode
  {
    // Operations
  private:
    /**
     * Default constructor
     */
    CEvaluationNodeVariable();
  
  public:
    /**
     * Default constructor
     * @param const SubType & subType
     * @param const Data & data
     */
    CEvaluationNodeVariable(const SubType & subType,
                            const Data & data);
  
    /**
     * Copy constructor
     * @param const CEvaluationNodeVariable & src
     */
    CEvaluationNodeVariable(const CEvaluationNodeVariable & src);
  
    /**
     * Destructor
     */
    virtual ~CEvaluationNodeVariable();
  
    /**
     * Compile a node;
     * @param const CEvaluationTree * pTree
     * @return CIssue issue;
     */
    virtual CIssue compile(const CEvaluationTree * pTree);
  
    /**
     * Calculate the numerical result of the node. It is assumed that
     * all child nodes are up to date.
     */
    virtual void calculate();
  
    /**
     * Figure out the appropriate CUnit to use, based on the child nodes.
     * This sets the default, appropriate for many cases, as Dimensionless
     * @param const CMathContainer & container
     * @param const std::vector< CUnit > & units
     * @return CUnit unit
     */
    virtual CValidatedUnit getUnit(const CMathContainer & container,
                                   const std::vector< CValidatedUnit > & units) const;
  
    /**
     * Set the type the result of the node
     * @param const ValueType & valueType
     * @return CIssue issue;
     */
    virtual CIssue setValueType(const ValueType & valueType);
  
    /**
     * Creates a new CEvaluationNodeCall from an ASTNode and the given children
     * @param const ASTNode* pNode
     * @param const std::vector< CEvaluationNode * > & children
     * @return CEvaluationNode * pCretedNode
     */
    static CEvaluationNode * fromAST(const ASTNode * pASTNode, const std::vector< CEvaluationNode * > & children);
  
    /**
     * Converts this node to an AST Node of type AST_NAME
     * @return ASTNode* the resulting ASTNode.
     */
    virtual ASTNode* toAST(const CDataModel* pDataModel) const;
  
    /**
     * Build the MathML string
     * @param const std::vector< std::string > & children
     * @param bool expand = true
     * @param const std::vector< std::vector< std::string > > & variables
     * @return std::string MMLString
     */
    virtual std::string getMMLString(const std::vector< std::string > & children,
                                     bool expand,
                                     const std::vector< std::vector< std::string > > & variables) const;
  
    /**
     * return the index of the variable in the function parameter list
     */
    size_t getIndex() const;
  
    //Attributes
  private:
    /**
     * Pointer to the evaluation tree.
     */
    const CEvaluationTree * mpTree;
  
    /**
     * Index of the variable used to retrieve its value from the tree.
     */
    size_t mIndex;
  };
  
  #endif // COPASI_CEvaluationNodeVariable
  