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93 lines
3.1 KiB
93 lines
3.1 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its contributors may be used to endorse or promote products derived |
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// from this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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#ifndef INCLUDED_IMF_RATIONAL_H |
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#define INCLUDED_IMF_RATIONAL_H |
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//----------------------------------------------------------------------------- |
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// |
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// Rational numbers |
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// |
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// A rational number is represented as pair of integers, n and d. |
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// The value of of the rational number is |
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// |
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// n/d for d > 0 |
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// positive infinity for n > 0, d == 0 |
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// negative infinity for n < 0, d == 0 |
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// not a number (NaN) for n == 0, d == 0 |
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// |
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//----------------------------------------------------------------------------- |
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namespace Imf { |
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class Rational |
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{ |
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public: |
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int n; // numerator |
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unsigned int d; // denominator |
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//---------------------------------------- |
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// Default constructor, sets value to zero |
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//---------------------------------------- |
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Rational (): n (0), d (1) {} |
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//------------------------------------- |
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// Constructor, explicitly sets n and d |
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//------------------------------------- |
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Rational (int n, int d): n (n), d (d) {} |
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//---------------------------- |
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// Constructor, approximates x |
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//---------------------------- |
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explicit Rational (double x); |
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//--------------------------------- |
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// Approximate conversion to double |
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//--------------------------------- |
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operator double () const {return double (n) / double (d);} |
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}; |
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} // namespace Imf |
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#endif
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