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