// Copyright (c) 2004-2022 Tomáš Oberhuber et al.
//
// This file is part of TNL - Template Numerical Library (https://tnl-project.org/)
//
// SPDX-License-Identifier: MIT

/***
 * Authors:
 * Oberhuber Tomas, tomas.oberhuber@fjfi.cvut.cz
 * Daniel Simon, dansimon93@gmail.com
 */

#pragma once

namespace TNL {
namespace Arithmetics {

template< class T >
class Double
{
public:
   T data[ 2 ];

   Double();
   Double( const Double< T >& value );
   explicit Double( const T& value );
   explicit Double( int value );

   Double< T >&
   operator=( const Double< T >& rhs );
   Double< T >&
   operator-();
   Double< T >&
   operator+();
   Double< T >&
   operator+=( const Double< T >& rhs );
   Double< T >&
   operator-=( const Double< T >& rhs );
   Double< T >&
   operator*=( const Double< T >& rhs );
   Double< T >&
   operator/=( const Double< T >& rhs );
   Double< T >
   operator+( const Double< T >& rhs ) const;
   Double< T >
   operator-( const Double< T >& rhs ) const;
   Double< T >
   operator*( const Double< T >& rhs ) const;
   Double< T >
   operator/( const Double< T >& rhs ) const;
   bool
   operator==( const Double< T >& rhs ) const;
   bool
   operator!=( const Double< T >& rhs ) const;
   bool
   operator<( const Double< T >& rhs ) const;
   bool
   operator>( const Double< T >& rhs ) const;
   bool
   operator>=( const Double< T >& rhs ) const;
   bool
   operator<=( const Double< T >& rhs ) const;
   explicit operator T() const;
};

/// TODO
template< typename T >
void
zeroDouble( T* d );
template< typename T >
void
twoSum( T a, T b, T* s, T* e );
template< typename T >
void
quickTwoSum( T a, T b, T* s, T* e );
template< typename T >
void
split( T a, T* a_hi, T* a_lo );
template< typename T >
void
twoProduct( T a, T b, T* p, T* e );
template< typename T >
void
renormalize( T* a, T* b );
template< typename T >
void
doubleAdd( const T* a, const T* b, T* s );
template< typename T >
void
doubleMul( const T* a, const T* b, T* s );
template< typename T >
void
printDouble( T* d );

}  // namespace Arithmetics
}  // namespace TNL