PBRT
/home/felix/UBC/projects/AdaptiveLightfieldSampling/pbrt_v2/src/3rdparty/openexr-1.7.0/ImfRational.h
00001 
00002 //
00003 // Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
00004 // Digital Ltd. LLC
00005 // 
00006 // All rights reserved.
00007 // 
00008 // Redistribution and use in source and binary forms, with or without
00009 // modification, are permitted provided that the following conditions are
00010 // met:
00011 // *       Redistributions of source code must retain the above copyright
00012 // notice, this list of conditions and the following disclaimer.
00013 // *       Redistributions in binary form must reproduce the above
00014 // copyright notice, this list of conditions and the following disclaimer
00015 // in the documentation and/or other materials provided with the
00016 // distribution.
00017 // *       Neither the name of Industrial Light & Magic nor the names of
00018 // its contributors may be used to endorse or promote products derived
00019 // from this software without specific prior written permission. 
00020 // 
00021 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00022 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00023 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00024 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
00025 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00027 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00028 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00029 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00030 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00031 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00032 //
00034 
00035 
00036 #ifndef INCLUDED_IMF_RATIONAL_H
00037 #define INCLUDED_IMF_RATIONAL_H
00038 
00039 //-----------------------------------------------------------------------------
00040 //
00041 //      Rational numbers
00042 //
00043 //      A rational number is represented as pair of integers, n and d.
00044 //      The value of of the rational number is
00045 // 
00046 //              n/d                     for d > 0
00047 //              positive infinity       for n > 0, d == 0
00048 //              negative infinity       for n < 0, d == 0
00049 //              not a number (NaN)      for n == 0, d == 0
00050 //
00051 //-----------------------------------------------------------------------------
00052 
00053 namespace Imf {
00054 
00055 class Rational
00056 {
00057   public:
00058 
00059     int                 n;              // numerator
00060     unsigned int        d;              // denominator
00061 
00062 
00063     //----------------------------------------
00064     // Default constructor, sets value to zero
00065     //----------------------------------------
00066 
00067     Rational (): n (0), d (1) {}
00068 
00069 
00070     //-------------------------------------
00071     // Constructor, explicitly sets n and d
00072     //-------------------------------------
00073 
00074     Rational (int n, int d): n (n), d (d) {}
00075 
00076 
00077     //----------------------------
00078     // Constructor, approximates x
00079     //----------------------------
00080 
00081     explicit Rational (double x);
00082 
00083 
00084     //---------------------------------
00085     // Approximate conversion to double
00086     //---------------------------------
00087 
00088     operator double () const {return double (n) / double (d);}
00089 };
00090 
00091 } // namespace Imf
00092 
00093 #endif