/*****************************************************************************

 Header:       FGVaporPressureItem.h	
 Author:       Christian Mayer
 Date started: 28.05.99

 ---------- Copyright (C) 1999  Christian Mayer (vader@t-online.de) ----------

 This program 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.

 This program 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.

 Further information about the GNU General Public License can also be found on
 the world wide web at http://www.gnu.org.

FUNCTIONAL DESCRIPTION
------------------------------------------------------------------------------
Vapor pressure item that is stored in the micro weather class

HISTORY
------------------------------------------------------------------------------
28.05.1999 Christian Mayer	Created
16.06.1999 Durk Talsma		Portability for Linux
20.06.1999 Christian Mayer	added lots of consts
*****************************************************************************/

/****************************************************************************/
/* SENTRY                                                                   */
/****************************************************************************/
#ifndef FGVaporPressureItem_H
#define FGVaporPressureItem_H

/****************************************************************************/
/* INCLUDES								    */
/****************************************************************************/
#include "FGWeatherDefs.h"
		
/****************************************************************************/
/* DEFINES								    */
/****************************************************************************/
class FGVaporPressureItem;
FGVaporPressureItem operator-(const FGVaporPressureItem& arg);

/****************************************************************************/
/* CLASS DECLARATION							    */
/****************************************************************************/
class FGVaporPressureItem
{
private:
    WeatherPrecition value;
    WeatherPrecition alt;

protected:
public:

    FGVaporPressureItem(const WeatherPrecition& a, const WeatherPrecition& v)	{alt = a; value = v;}
    FGVaporPressureItem(const WeatherPrecition& v)				{alt = 0.0; value = v;}
    FGVaporPressureItem()							{alt = 0.0; value = FG_WEATHER_DEFAULT_VAPORPRESSURE;}

    WeatherPrecition getValue() const { return value; };
    WeatherPrecition getAlt()   const { return alt;   };

    FGVaporPressureItem& operator*= (const WeatherPrecition& arg);
    FGVaporPressureItem& operator+= (const FGVaporPressureItem& arg);
    FGVaporPressureItem& operator-= (const FGVaporPressureItem& arg);

    friend bool operator<(const FGVaporPressureItem& arg1, const FGVaporPressureItem& arg2 );
    friend FGVaporPressureItem operator-(const FGVaporPressureItem& arg);

};

inline FGVaporPressureItem& FGVaporPressureItem::operator*= (const WeatherPrecition& arg)
{
  value *= arg;
  return *this;
}
inline FGVaporPressureItem& FGVaporPressureItem::operator+= (const FGVaporPressureItem& arg)
{
  value += arg.value;
  return *this;
}

inline FGVaporPressureItem& FGVaporPressureItem::operator-= (const FGVaporPressureItem& arg)
{
  value -= arg.value;
  return *this;
}

inline FGVaporPressureItem operator-(const FGVaporPressureItem& arg)
{
    return FGVaporPressureItem(arg.alt, -arg.value);
}

/****************************************************************************/
#endif /*FGVaporPressureItem_H*/