Differential D6807 Diff 21646 extern/opennurbs/opennurbs_rand.h

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extern/opennurbs/opennurbs_rand.h

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				/* $NoKeywords: $ */
				/*
				//
				// Copyright (c) 1993-2012 Robert McNeel & Associates. All rights reserved.
				// OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert
				// McNeel & Associates.
				//
				// THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
				// ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF
				// MERCHANTABILITY ARE HEREBY DISCLAIMED.
				//
				// For complete openNURBS copyright information see <http://www.opennurbs.org>.
				//
				////////////////////////////////////////////////////////////////
				*/

				#if !defined(OPENNURBS_RANDOM_NUMBER_INC_)
				#define OPENNURBS_RANDOM_NUMBER_INC_

				ON_BEGIN_EXTERNC

				struct ON_RANDOM_NUMBER_CONTEXT
				{
				ON__UINT32 mti; /* mti = 0xFFFFFFFF means mt[] is not initialized */
				ON__UINT32 mt[624]; /* the array for the state vector */
				};


				/*
				Description:
				Seed a context for on_random_number().
				Parameters:
				s - [in]
				rand_context - [out] context to seed.

				Remarks:
				on_random_number_seed() does not use any static memory.
				Example:
				ON_RAND_CONTEXT rand_context;

				ON__UINT seed = 123;
				on_random_number_seed( seed, &rand_context );

				ON__UINT32 r1 = on_random_number( &rand_context );
				ON__UINT32 r2 = on_random_number( &rand_context );
				ON__UINT32 r3 = on_random_number( &rand_context );
				*/
				void on_random_number_seed(
				ON__UINT32 s,
				struct ON_RANDOM_NUMBER_CONTEXT* rand_context
				);

				/*
				Description:
				Get a random number.
				Parameters:
				rand_context - [in/out]
				random number context. The first time rand_context is
				used it must be either initialized by calling on_random_number_seed()
				or rand_context->mti must be set to 0xFFFFFFFF. Otherwise do not
				modify randcontext between calls to on_random_number.
				Returns:
				A random number.
				Remarks:
				on_random_number() does not use any static memory.
				Example:
				ON_RAND_CONTEXT rand_context;

				ON__UINT seed = 123;
				on_random_number_seed( seed, &rand_context );

				ON__UINT32 r1 = on_random_number( &rand_context );
				ON__UINT32 r2 = on_random_number( &rand_context );
				ON__UINT32 r3 = on_random_number( &rand_context );
				*/
				ON__UINT32 on_random_number(
				struct ON_RANDOM_NUMBER_CONTEXT* rand_context
				);


				/*
				Description:
				Seed the random number generator used by on_rand().
				Parameters:
				s - [in]
				Remarks:
				on_srand() is not thread safe. It used static global memory
				that is modified by on_srand() and on_rand().
				*/
				void on_srand(ON__UINT32 s);

				/*
				Description:
				Get a random number.
				Returns:
				A random number.
				Remarks:
				on_rand() is not thread safe. It used static global memory
				that is modified by on_srand() and on_rand().
				*/
				ON__UINT32 on_rand(void);


				ON_END_EXTERNC


				#if defined(ON_CPLUSPLUS)

				class ON_CLASS ON_RandomNumberGenerator
				{
				public:
				ON_RandomNumberGenerator();

				/*
				Description:
				Seed the random number generator.
				Parameters:
				s - [in]
				*/
				void Seed( ON__UINT32 s );

				/*
				Description:
				Seed the random number generator in a way that cannot be reproduced.
				*/
				void Seed();

				/*
				Returns:
				32 bit unsigned random number [0,0xFFFFFFFF] [0,4294967295]
				*/
				ON__UINT32 RandomNumber();

				/*
				Returns:
				double in the interval [0.0 and 1.0]
				*/
				double RandomDouble();

				/*
				Returns:
				double in the interval [t0,t1]
				*/
				double RandomDouble(double t0, double t1);

				/*
				Description:
				Perform a random permuation on an array.
				Parameters:
				base - [in/out]
				Array of element to permute
				nel - [in]
				number of elements in the array.
				sizeof_element
				size of an element in bytes.
				*/
				void RandomPermutation(void* base, size_t nel, size_t sizeof_element );

				private:
				struct ON_RANDOM_NUMBER_CONTEXT m_rand_context;
				};

				#endif


				#endif