Added libs/minisat (copy of minisat git master)

1 files changed, 67 insertions, 0 deletions

diff --git a/libs/minisat/Rnd.h b/libs/minisat/Rnd.h
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+/*******************************************************************************************[Rnd.h]
+Copyright (c) 2012, Niklas Sorensson
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+**************************************************************************************************/
+
+#ifndef Minisat_Rnd_h
+#define Minisat_Rnd_h
+
+#include "libs/minisat/Vec.h"
+
+namespace Minisat {
+
+// Generate a random double:
+static inline double drand(double& seed)
+{
+    seed *= 1389796;
+    int q = (int)(seed / 2147483647);
+    seed -= (double)q * 2147483647;
+    return seed / 2147483647;
+}
+
+
+// Generate a random integer:
+static inline int irand(double& seed, int size) { return (int)(drand(seed) * size); }
+
+
+// Randomly shuffle the contents of a vector:
+template<class T>
+static void randomShuffle(double& seed, vec<T>& xs)
+{
+    for (int i = 0; i < xs.size(); i++){
+        int pick = i + irand(seed, xs.size() - i);
+        T tmp = xs[i];
+        xs[i] = xs[pick];
+        xs[pick] = tmp;
+    }
+}
+
+// Randomly shuffle a vector of a vector (ugly)
+template<class T>
+static void randomShuffle(double& seed, vec<vec<T> >& xs)
+{
+    for (int i = 0; i < xs.size(); i++){
+        int pick = i + irand(seed, xs.size() - i);
+        vec<T> tmp; xs[i].moveTo(tmp);
+        xs[pick].moveTo(xs[i]);
+        tmp.moveTo(xs[pick]);
+    }
+}
+
+
+//=================================================================================================
+} // namespace Minisat
+#endif