| 1 | /////////////////////////////////////////////////////////////////////////// |
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| 2 | // |
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| 3 | // Copyright (c) 2006, Industrial Light & Magic, a division of Lucas |
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| 4 | // Digital Ltd. LLC |
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| 5 | // |
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| 6 | // All rights reserved. |
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| 7 | // |
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| 8 | // Redistribution and use in source and binary forms, with or without |
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| 9 | // modification, are permitted provided that the following conditions are |
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| 10 | // met: |
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| 11 | // * Redistributions of source code must retain the above copyright |
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| 12 | // notice, this list of conditions and the following disclaimer. |
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| 13 | // * Redistributions in binary form must reproduce the above |
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| 14 | // copyright notice, this list of conditions and the following disclaimer |
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| 15 | // in the documentation and/or other materials provided with the |
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| 16 | // distribution. |
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| 17 | // * Neither the name of Industrial Light & Magic nor the names of |
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| 18 | // its contributors may be used to endorse or promote products derived |
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| 19 | // from this software without specific prior written permission. |
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| 20 | // |
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| 21 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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| 22 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| 23 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| 24 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| 25 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 26 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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| 27 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 28 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 29 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 30 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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| 31 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 32 | // |
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| 33 | /////////////////////////////////////////////////////////////////////////// |
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| 34 | |
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| 35 | |
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| 36 | #ifndef INCLUDED_IMF_RATIONAL_H |
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| 37 | #define INCLUDED_IMF_RATIONAL_H |
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| 38 | |
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| 39 | #include "ImfExport.h" |
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| 40 | #include "ImfNamespace.h" |
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| 41 | |
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| 42 | //----------------------------------------------------------------------------- |
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| 43 | // |
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| 44 | // Rational numbers |
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| 45 | // |
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| 46 | // A rational number is represented as pair of integers, n and d. |
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| 47 | // The value of of the rational number is |
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| 48 | // |
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| 49 | // n/d for d > 0 |
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| 50 | // positive infinity for n > 0, d == 0 |
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| 51 | // negative infinity for n < 0, d == 0 |
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| 52 | // not a number (NaN) for n == 0, d == 0 |
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| 53 | // |
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| 54 | //----------------------------------------------------------------------------- |
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| 55 | |
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| 56 | OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER |
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| 57 | |
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| 58 | |
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| 59 | class Rational |
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| 60 | { |
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| 61 | public: |
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| 62 | |
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| 63 | int n; // numerator |
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| 64 | unsigned int d; // denominator |
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| 65 | |
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| 66 | |
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| 67 | //---------------------------------------- |
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| 68 | // Default constructor, sets value to zero |
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| 69 | //---------------------------------------- |
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| 70 | |
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| 71 | Rational (): n (0), d (1) {} |
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| 72 | |
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| 73 | |
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| 74 | //------------------------------------- |
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| 75 | // Constructor, explicitly sets n and d |
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| 76 | //------------------------------------- |
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| 77 | |
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| 78 | Rational (int n, int d): n (n), d (d) {} |
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| 79 | |
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| 80 | |
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| 81 | //---------------------------- |
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| 82 | // Constructor, approximates x |
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| 83 | //---------------------------- |
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| 84 | |
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| 85 | IMF_EXPORT |
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| 86 | explicit Rational (double x); |
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| 87 | |
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| 88 | |
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| 89 | //--------------------------------- |
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| 90 | // Approximate conversion to double |
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| 91 | //--------------------------------- |
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| 92 | |
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| 93 | operator double () const {return double (n) / double (d);} |
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| 94 | }; |
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| 95 | |
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| 96 | |
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| 97 | OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT |
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| 98 | |
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| 99 | #endif |
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| 100 | |
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