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

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C++ Header | 93 lines | 15 code | 20 blank | 58 comment | 0 complexity | dae7bc540c0673ebbd66d8915d124004 MD5 | raw file
 1///////////////////////////////////////////////////////////////////////////
 2//
 3// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
 4// Digital Ltd. LLC
 5// 
 6// All rights reserved.
 7// 
 8// Redistribution and use in source and binary forms, with or without
 9// modification, are permitted provided that the following conditions are
10// met:
11// *       Redistributions of source code must retain the above copyright
12// notice, this list of conditions and the following disclaimer.
13// *       Redistributions in binary form must reproduce the above
14// copyright notice, this list of conditions and the following disclaimer
15// in the documentation and/or other materials provided with the
16// distribution.
17// *       Neither the name of Industrial Light & Magic nor the names of
18// its contributors may be used to endorse or promote products derived
19// from this software without specific prior written permission. 
20// 
21// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
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