Teuchos_ParameterEntry.hpp

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// ***********************************************************************
// 
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// This library is distributed in the hope that it will be useful, but
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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#ifndef TEUCHOS_PARAMETER_ENTRY_H
#define TEUCHOS_PARAMETER_ENTRY_H

#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_any.hpp"

namespace Teuchos {

#ifndef DOXYGEN_SHOULD_SKIP_THIS
class ParameterList; // another parameter type (forward declaration)
#endif

class ParameterEntry {

public:

  ParameterEntry();
  
  ParameterEntry(const ParameterEntry& source);

  template<typename T>
  ParameterEntry(T value, bool isDefault = false)
  : val_(value),
    isUsed_(false),
    isDefault_(isDefault)
  {}

  ~ParameterEntry() {};



  ParameterEntry& operator=(const ParameterEntry& source);

  template<typename T>
  void setValue(T value, bool isDefault = false)
  {
    val_ = value;
    isDefault_ = isDefault;
  }

  ParameterList& setList(bool isDefault = false);


   
  template<typename T>
  T& getValue(T *ptr) const
  {
    isUsed_ = true;
    return const_cast<T&>(Teuchos::any_cast<T>( val_ ));
  }


  
  bool isUsed() const { return isUsed_; }

  bool isList() const { return isList_; }


  ostream& leftshift(ostream& os) const;

private:

  void reset();
  
  any val_;

  bool isList_;

  mutable bool isUsed_;

  mutable bool isDefault_;

};

template<typename T>
T& getValue( const ParameterEntry &entry )
{
  return entry.getValue((T*)NULL);
}

inline ostream& operator<<(ostream& os, const ParameterEntry& e) 
{ 
  return e.leftshift(os);
}

} // namespace Teuchos


#endif

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