/src/FreeImage/Source/OpenEXR/IlmImf/ImfRational.h

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