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ImfRational.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
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// Redistribution and use in source and binary forms, with or without
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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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