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94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
///////////////////////////////////////////////////////////////////////////
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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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