From 94d3e79a8617f88dc0219cfdeedfa3147833719d Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 24 Jun 2019 14:43:36 +0200
Subject: Initialize at openlb-1-3

---
 src/utilities/fraction.h | 73 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/utilities/fraction.h

(limited to 'src/utilities/fraction.h')

diff --git a/src/utilities/fraction.h b/src/utilities/fraction.h
new file mode 100644
index 0000000..2049540
--- /dev/null
+++ b/src/utilities/fraction.h
@@ -0,0 +1,73 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2019 Adrian Kummerlaender
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this program; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+#ifndef UTILITIES_FRACTION_H
+#define UTILITIES_FRACTION_H
+
+#include <stdexcept>
+
+namespace olb {
+
+namespace utilities {
+
+/// Floating-point independent fraction type
+class Fraction {
+private:
+  const int _numerator;
+  const int _denominator;
+
+public:
+  constexpr Fraction(int num, int denum):
+    _numerator(num), _denominator(denum) {
+    if (_denominator == 0) {
+      throw std::invalid_argument("denominator must not be zero");
+    }
+  }
+
+  constexpr Fraction(int parts[2]):
+    Fraction(parts[0], parts[1]) { }
+
+  constexpr Fraction(int num):
+    Fraction(num, 1) { }
+
+  constexpr Fraction():
+    Fraction(0) { }
+
+  template <typename T>
+  constexpr T as() const
+  {
+    return T(_numerator) / T(_denominator);
+  }
+
+  template <typename T>
+  constexpr T inverseAs() const
+  {
+    return _numerator != 0 ? T(_denominator) / T(_numerator) : throw std::invalid_argument("inverse of zero is undefined");
+  }
+};
+
+}
+
+}
+
+#endif
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