Pi.h

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/* Copyright (C) 2008 - 2009, Bernd Speiser */

/* This file is part of PhysicalQuantities.

PhysicalQuantities 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 2
of the License, or (at your option) any later version.

PhysicalQuantities 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
*/

#ifndef _Pi_h
#define _Pi_h

// Quantity includes
#include "Quantity/UniqueConstant.h"
#include "PhysicalQuantities/PureNumber.h"

namespace quantity {
  namespace pi {

typedef pureNumber::Quantity Quantity;

class DerivedPi;

  } // end namespace pi

// the derived quantity traits template for PureNumber Pi
template<>
  struct DerivedQuantityTraits<pureNumber::Class, pi::DerivedPi>
  {
    static const bool OverwriteName = true;
    static const bool OverwriteSymbol = true;

    static const std::string NameString;
    static const std::string SymbolString;

  };

typedef Loki::SingletonHolder<UniqueConstant <pureNumber::Quantity, 
                     DerivedQuantity<pureNumber::Class, pureNumber::Unity, pi::DerivedPi> > > Pi;

#define PI Pi::Instance()

}

#endif /* _Pi_h */

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