Current File : //usr/include/OpenEXR/ImfRational.h
///////////////////////////////////////////////////////////////////////////
//
// 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
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