custom-precision-double.h

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/* WOSS - World Ocean Simulation System -
 * 
 * Copyright (C) 2009 2025 Federico Guerra
 * and regents of the SIGNET lab, University of Padova
 *
 * Author: Federico Guerra - WOSS@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
 */ 
 
 
#ifndef CUSTOM_PRECISION_DOUBLE_H
#define CUSTOM_PRECISION_DOUBLE_H
 
 
#include <iostream>
#include <cmath>
 
 
namespace woss {
 
  static constexpr inline double PDOUBLE_DEFAULT_PRECISION = 1.0e-17;
 
  class PDouble {
 
    
    public:
    
    constexpr PDouble( const long double input = 0.0, const long double precision = PDOUBLE_DEFAULT_PRECISION ) noexcept;
    
    PDouble( const PDouble& copy ) noexcept = default;
 
    PDouble( PDouble&& tmp ) noexcept = default;
    
    ~PDouble() noexcept = default;
 
    constexpr void setPrecision( double value ) noexcept { precision = value; }
    
    constexpr long double getPrecision() const noexcept { return precision; }
 
    constexpr long double getValue() const noexcept { return value; }
 
 
    constexpr PDouble& operator=( const PDouble& copy ) noexcept = default;
 
    constexpr PDouble& operator=( PDouble&& tmp ) noexcept = default;
    
    constexpr operator int() const;
    
    constexpr operator float() const;
 
    constexpr operator double() const;
    
    constexpr operator long double() const;
 
    friend constexpr PDouble operator+( const PDouble& left, const PDouble& right );
 
    friend constexpr PDouble operator-( const PDouble& left, const PDouble& right );
 
    friend constexpr PDouble operator/( const PDouble& left, const PDouble& right );
 
    friend constexpr PDouble operator*( const PDouble& left, const PDouble& right );
 
    friend constexpr PDouble operator%( const PDouble& left, const PDouble& right );
 
    friend constexpr PDouble& operator+=( PDouble& left, const PDouble& right );
    
    friend constexpr PDouble& operator-=( PDouble& left, const PDouble& right );
 
    friend constexpr PDouble& operator/=( PDouble& left, const PDouble& right );
 
    friend constexpr PDouble& operator*=( PDouble& left, const PDouble& right );
 
    friend constexpr PDouble& operator%=( PDouble& left, const PDouble& right );
 
    friend constexpr bool operator==( const PDouble& left, const PDouble& right );
 
    friend constexpr bool operator!=( const PDouble& left, const PDouble& right );
 
    friend constexpr bool operator>( const PDouble& left, const PDouble& right );
 
    friend constexpr bool operator<( const PDouble& left, const PDouble& right );
 
    friend constexpr bool operator>=( const PDouble& left, const PDouble& right );
 
    friend constexpr 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;
 
  };
 
 
  // inline functions
  inline constexpr PDouble::PDouble( const long double input, const long double prec ) noexcept
  : value(input), 
    precision(prec)
  {
  
  }
  
  inline constexpr PDouble::operator double() const {
    return(static_cast<double>(value)) ;
  }
 
 
  inline constexpr PDouble::operator int() const {
    return(static_cast<int>(value));
  }
 
 
  inline constexpr PDouble::operator float() const {
    return(static_cast<float>(value));
  }
 
 
  inline constexpr PDouble::operator long double() const {
    return(static_cast<long double>(value));
  }
 
 
  inline constexpr PDouble operator+( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value + right.value, std::max(left.precision, right.precision)) );
  }
 
 
  inline constexpr PDouble operator-( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value - right.value, std::max(left.precision, right.precision)) );
  }
 
 
  inline constexpr PDouble operator/( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value / right.value, std::max(left.precision, right.precision)) );
  }
 
 
  inline constexpr PDouble operator*( const PDouble& left, const PDouble& right ) {
    return( PDouble(left.value * right.value, std::max(left.precision, right.precision)) );
  }
 
 
  inline constexpr PDouble operator%( const PDouble& left, const PDouble& right ) {
    return( PDouble( std::fmod(left.value, right.value), std::max(left.precision, right.precision) ) );
  }
 
 
  inline constexpr PDouble& operator+=( PDouble& left, const PDouble& right ) {
    left.value += right.value;
    return left;
  }
 
 
  inline constexpr PDouble& operator-=( PDouble& left, const PDouble& right ) {
    left.value -= right.value;
    return left;
  }
 
 
  inline constexpr PDouble& operator/=( PDouble& left, const PDouble& right ) {
    left.value /= right.value;
    return left;
  }
 
 
  inline constexpr PDouble& operator*=( PDouble& left, const PDouble& right ) {
    left.value *= right.value;
    return left;
  }
 
 
  inline constexpr PDouble& operator%=( PDouble& left, const PDouble& right ) {
    left.value = std::fmod(left.value, right.value);
    return left;
  }
 
 
  inline constexpr bool operator==( const PDouble& left, const PDouble& right ) {
    if ( &left == &right ) 
      return true; 
    return( std::abs(left.value - right.value) <= left.precision );
  }
 
 
  inline constexpr bool operator!=( const PDouble& left, const PDouble& right ) {
    if ( &left == &right )
      return false; 
    return( std::abs(left.value - right.value) > left.precision );
  }
 
 
  inline constexpr bool operator>( const PDouble& left, const PDouble& right ) {
    if ( left == right ) 
      return false;
    return( left.value > right.value );
  }
 
 
  inline constexpr bool operator<( const PDouble& left, const PDouble& right ) {
    if ( left == right ) 
      return false;
    return( left.value < right.value );
  }
 
 
  inline constexpr bool operator>=( const PDouble& left, const PDouble& right ) {
    if ( left == right ) 
      return true;
    return( left.value > right.value );
  }
 
 
  inline constexpr 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 */