custom-precision-double.h

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/* WOSS - World Ocean Simulation System -
 * 
 * Copyright (C) 2009 Federico Guerra
 * and regents of the SIGNET lab, University of Padova
 *
 * Author: Federico Guerra - federico@guerra-tlc.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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
 */ 
 
/*
 * This software has been developed by Federico Guerra and SIGNET lab,
 * University of Padova, in collaboration with the NATO Centre for 
 * Maritime Research and Experimentation (http://www.cmre.nato.int ; 
 * E-mail: pao@cmre.nato.int), whose support is gratefully acknowledged.
 */
 
 
#ifndef CUSTOM_PRECISION_DOUBLE_H
#define CUSTOM_PRECISION_DOUBLE_H
 
 
#include <iostream>
#include <cmath>
 
 
 
namespace woss {
    
    
  #define PDOUBLE_DEFAULT_PRECISION (1.0e-17)
 
  class PDouble {
 
    
    public:
    
    PDouble( const long double input = 0.0, const long double precision = PDOUBLE_DEFAULT_PRECISION );
    
    PDouble( const PDouble& copy );
    
    ~PDouble();
    
    
    static void setDebug( bool flag ) { debug = flag; }
 
    void setPrecision( double value ) { precision = value; }
    
    
    long double getPrecision() const { return precision; }
 
    long double getValue() const { return value; }
 
 
    PDouble& operator=( const PDouble& copy );
 
    
    operator int() const;
    
    operator float() const;
 
    operator double() const;
    
    operator long double() const;
    
    
    friend const PDouble operator+( const PDouble& left, const PDouble& right );
 
    friend const PDouble operator-( const PDouble& left, const PDouble& right );
 
    friend const PDouble operator/( const PDouble& left, const PDouble& right );
 
    friend const PDouble operator*( const PDouble& left, const PDouble& right );
 
    friend const PDouble operator%( const PDouble& left, const PDouble& right );
    
 
    friend PDouble& operator+=( PDouble& left, const PDouble& right );
    
    friend PDouble& operator-=( PDouble& left, const PDouble& right );
 
    friend PDouble& operator/=( PDouble& left, const PDouble& right );
 
    friend PDouble& operator*=( PDouble& left, const PDouble& right );
    
    friend PDouble& operator%=( PDouble& left, const PDouble& right );
 
    
    friend bool operator==( const PDouble& left, const PDouble& right );
 
    friend bool operator!=( const PDouble& left, const PDouble& right );
    
    
    friend bool operator>( const PDouble& left, const PDouble& right );
 
    friend bool operator<( const PDouble& left, const PDouble& right );
 
    friend bool operator>=( const PDouble& left, const PDouble& right );
 
    friend bool operator<=( const PDouble& left, const PDouble& right );
    
    
    friend ::std::ostream& operator<<( ::std::ostream& os, const PDouble& instance );
 
    friend ::std::istream& operator>>( ::std::istream& is, PDouble& instance );
    
 
    
    protected:
 
    long double value;
 
    long double precision;
 
    
    static bool debug;
 
  };
 
 
  // inline functions
 
  inline PDouble::operator double() const {
    return( (double) value) ;
  }
 
 
  inline PDouble::operator int() const {
    return( (int) value );
  }
 
 
  inline PDouble::operator float() const {
    return( (float) value );
  }
 
 
  inline PDouble::operator long double() const {
    return( (long double) value );
  }
 
 
  inline const PDouble operator+( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value + right.value, ::std::max(left.precision, right.precision)) );
  }
 
 
  inline const PDouble operator-( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value - right.value, ::std::max(left.precision, right.precision)) );
  }
 
 
  inline const PDouble operator/( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value / right.value, ::std::max(left.precision, right.precision)) );
  }
 
 
  inline const PDouble operator*( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value * right.value, ::std::max(left.precision, right.precision)) );
  }
 
 
  inline const PDouble operator%( const PDouble& left, const PDouble& right ) {
    return( PDouble( ::std::fmod(left.value, right.value), ::std::max(left.precision, right.precision) ) );
  }
 
 
  inline PDouble& operator+=( PDouble& left, const PDouble& right ) {
  //   if ( &left == &right ) { /* self assignment code here */ }
    left.value += right.value;
    return left;
  }
 
 
  inline PDouble& operator-=( PDouble& left, const PDouble& right ) {
  //   if ( &left == &right ) { /* self assignment code here */ }
    left.value -= right.value;
    return left;
  }
 
 
  inline PDouble& operator/=( PDouble& left, const PDouble& right ) {
  //   if ( &left == &right ) { /* self assignment code here */ }
    left.value /= right.value;
    return left;
  }
 
 
  inline PDouble& operator*=( PDouble& left, const PDouble& right ) {
  //   if ( &left == &right ) { /* self assignment code here */ }
    left.value *= right.value;
    return left;
  }
 
 
  inline PDouble& operator%=( PDouble& left, const PDouble& right ) {
  //   if ( &left == &right ) { /* self assignment code here */ }
    left.value = ::std::fmod(left.value, right.value);
    return left;
  }
 
 
  inline bool operator==( const PDouble& left, const PDouble& right ) {
    if ( &left == &right ) { return true; }
    return( ::std::abs(left.value - right.value) <= left.precision );
  }
 
 
  inline bool operator!=( const PDouble& left, const PDouble& right ) {
    if ( &left == &right ) { return false; }
    return( ::std::abs(left.value - right.value) > left.precision );
  }
 
 
  inline bool operator>( const PDouble& left, const PDouble& right ) {
    if ( left == right ) return false;
    return( left.value > right.value );
  }
 
 
  inline bool operator<( const PDouble& left, const PDouble& right ) {
    if ( left == right ) return false;
    return( left.value < right.value );
  }
 
 
  inline bool operator>=( const PDouble& left, const PDouble& right ) {
    if ( left == right ) return true;
    return( left.value > right.value );
  }
 
 
  inline bool operator<=( const PDouble& left, const PDouble& right ) {
    if ( left == right ) return true;
    return( left.value < right.value );
  }
 
 
  inline ::std::ostream& operator<<( ::std::ostream& os, const PDouble& instance ) {
    os << instance.value;
    return os;
  }
 
 
  inline ::std::istream& operator>>( ::std::istream& is, PDouble& instance ) {
    is >> instance.value;
    return is;
  }
 
}
 
#endif /* CUSTOM_PRECISION_DOUBLE_H */