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91 lines
3.1 KiB
91 lines
3.1 KiB
//==============================================================================
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//
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// Copyright (c) 2002-
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// Authors:
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// * Andrew Hinton <ug60axh@cs.bham.uc.uk> (University of Birmingham)
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//
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//------------------------------------------------------------------------------
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//
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// This file is part of PRISM.
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//
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// PRISM is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// PRISM is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with PRISM; if not, write to the Free Software Foundation,
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// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//==============================================================================
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#ifndef _Included_simulator_Randomheader
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#define _Included_simulator_Randomheader
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//=============================================================================
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// Functions
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//=============================================================================
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//Use this function to instantiate implementations of CRandomGenerator
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void Set_Generator(int generatorID);
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//start the generator's pseudo-random number stream with the given seed
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void Seed_Generator(unsigned long seed_value);
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//start the generator's pseudo-random number stream with the system
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//clock
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void Seed_Generator_With_System_Clock();
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//Uniformly select an integer inclusively from this range
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//using the current generator
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int Random_Uniform_From_Range(int start, int end);
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//Select an index from the given probability distribution
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//using the current generator
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int Random_From_Prob_Distribution(double* distribution, int size);
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//Return a uniformly generated random double between 0 and 1
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//using the current generator
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double Random_Uniform();
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//============================================================================
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// Class Definitions
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//============================================================================
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//Interface for random number generator implementations
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class CRandomGenerator
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{
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public:
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//start the Pseudo-random number stream with the given seed
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virtual void Seed(unsigned long seed_value)=0;
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//uniformly select an integer inclusively from this range
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virtual int Random_Uniform_From_Range(int start, int end)=0;
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//Return a uniformly generated random double between 0 and 1
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virtual double Random_Uniform()=0;
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//Select an index from the given probability distribution
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virtual int Random_From_Prob_Distribution(double* distribution, int size)=0;
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};
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class CStandardRandomGenerator : public CRandomGenerator
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{
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public:
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void Seed(unsigned long seed_value);
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int Random_Uniform_From_Range(int start, int end);
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double Random_Uniform();
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int Random_From_Prob_Distribution(double* distribution, int size);
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private:
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int Prob_Distribution_Helper(int start, double max_prob, double* distribution, int size);
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};
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#endif
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