| /////////////////////////////////////////////////////////////////////////// |
| // |
| // Copyright (c) 2006, Industrial Light & Magic, a division of Lucas |
| // Digital Ltd. LLC |
| // |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Industrial Light & Magic nor the names of |
| // its contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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| // |
| /////////////////////////////////////////////////////////////////////////// |
| |
| |
| #ifndef INCLUDED_IMF_RATIONAL_H |
| #define INCLUDED_IMF_RATIONAL_H |
| |
| //----------------------------------------------------------------------------- |
| // |
| // Rational numbers |
| // |
| // A rational number is represented as pair of integers, n and d. |
| // The value of of the rational number is |
| // |
| // n/d for d > 0 |
| // positive infinity for n > 0, d == 0 |
| // negative infinity for n < 0, d == 0 |
| // not a number (NaN) for n == 0, d == 0 |
| // |
| //----------------------------------------------------------------------------- |
| |
| namespace Imf { |
| |
| class Rational |
| { |
| public: |
| |
| int n; // numerator |
| unsigned int d; // denominator |
| |
| |
| //---------------------------------------- |
| // Default constructor, sets value to zero |
| //---------------------------------------- |
| |
| Rational (): n (0), d (1) {} |
| |
| |
| //------------------------------------- |
| // Constructor, explicitly sets n and d |
| //------------------------------------- |
| |
| Rational (int n, int d): n (n), d (d) {} |
| |
| |
| //---------------------------- |
| // Constructor, approximates x |
| //---------------------------- |
| |
| explicit Rational (double x); |
| |
| |
| //--------------------------------- |
| // Approximate conversion to double |
| //--------------------------------- |
| |
| operator double () const {return double (n) / double (d);} |
| }; |
| |
| } // namespace Imf |
| |
| #endif |
