root/3rdparty/openexr/IlmImf/ImfRational.h

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INCLUDED FROM


///////////////////////////////////////////////////////////////////////////
//
// 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
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// *       Redistributions in binary form must reproduce the above
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// distribution.
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// its contributors may be used to endorse or promote products derived
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#ifndef INCLUDED_IMF_RATIONAL_H
#define INCLUDED_IMF_RATIONAL_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
//
//-----------------------------------------------------------------------------

namespace Imf {

class 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);}
};

} // namespace Imf

#endif

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