rand.h

/*
 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
 *
 * 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 __RANDOM_UTILS_H_
#define __RANDOM_UTILS_H_


#include <stdlib.h> 
#include <time.h>


/**
 * Generate a floating-point random number within the specified range.
 * @ingroup util
 */
inline float randf( float range_min=0.0f, float range_max=1.0f )		{ return ((float(rand()) / RAND_MAX) * (range_max - range_min)) + range_min; }


/**
 * Generate a random integer within the specified range.
 * @ingroup util
 */
inline int rand( int range_min, int range_max )							{ const float r = (randf() * (range_max - range_min)) + range_min; return int(r); }


/**
 * Seed the random number generator based on the system time.
 * @ingroup util
 */
inline void srand_time()												{ srand(time(NULL)); }


/**
 * Seed the random number generator from an unsigned integer value
 * (this standard function implemented by `stdlib.h`)
 * @ingroup util
 */
//void srand( unsigned int seed );


#endif