1///////////////////////////////////////////////////////////////////////////
2//
3// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
4// Digital Ltd. LLC
5//
6// All rights reserved.
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20//
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33///////////////////////////////////////////////////////////////////////////
34
35
36#ifndef INCLUDED_IMF_RATIONAL_H
37#define INCLUDED_IMF_RATIONAL_H
38
39#include "ImfExport.h"
40#include "ImfNamespace.h"
41
42//-----------------------------------------------------------------------------
43//
44// Rational numbers
45//
46// A rational number is represented as pair of integers, n and d.
47// The value of of the rational number is
48//
49// n/d for d > 0
50// positive infinity for n > 0, d == 0
51// negative infinity for n < 0, d == 0
52// not a number (NaN) for n == 0, d == 0
53//
54//-----------------------------------------------------------------------------
55
56OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
57
58
59class IMF_EXPORT Rational
60{
61 public:
62
63 int n; // numerator
64 unsigned int d; // denominator
65
66
67 //----------------------------------------
68 // Default constructor, sets value to zero
69 //----------------------------------------
70
71 Rational (): n (0), d (1) {}
72
73
74 //-------------------------------------
75 // Constructor, explicitly sets n and d
76 //-------------------------------------
77
78 Rational (int n, int d): n (n), d (d) {}
79
80
81 //----------------------------
82 // Constructor, approximates x
83 //----------------------------
84
85 explicit Rational (double x);
86
87
88 //---------------------------------
89 // Approximate conversion to double
90 //---------------------------------
91
92 operator double () const {return double (n) / double (d);}
93};
94
95
96OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
97
98#endif
99