///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission. 

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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///////////////////////////////////////////////////////////////////////////

#ifndef INCLUDED_IMF_RATIONAL_H

#define INCLUDED_IMF_RATIONAL_H

#include "ImfExport.h"

#include "ImfNamespace.h"

//-----------------------------------------------------------------------------

//

//  Rational numbers

//

//  A rational number is represented as pair of integers, n and d.

//  The value of of the rational number is

// 

//    n/d     for d > 0

//    positive infinity for n > 0, d == 0

//    negative infinity for n < 0, d == 0

//    not a number (NaN)  for n == 0, d == 0

//

//-----------------------------------------------------------------------------

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

class IMF_EXPORT Rational

{

  public:

    int     n;    // numerator

    unsigned int  d;    // denominator

    //----------------------------------------

    // Default constructor, sets value to zero

    //----------------------------------------

    Rational (): n (0), d (1) {}

    //-------------------------------------

    // Constructor, explicitly sets n and d

    //-------------------------------------

    Rational (int n, int d): n (n), d (d) {}

    //----------------------------

    // Constructor, approximates x

    //----------------------------

    explicit Rational (double x);

    //---------------------------------

    // Approximate conversion to double

    //---------------------------------

    operator double () const {return double (n) / double (d);}

};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif