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/*
* Copyright (C) 2007-2012 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_RANDOM_BASE_H
#define BU_RANDOM_BASE_H
#include <stdint.h>
namespace Bu
{
/**
* Base class for random number generators. This provides some basic
* implementations of standard helper functions. If your specific random
* number generator does not use the full range of a 32 bit integer then
* you'll want to override at least randNorm() to correct the range.
*
* Random number generators are not thread safe on their own. See
* Bu::Random.
*/
class RandomBase
{
public:
RandomBase();
virtual ~RandomBase();
virtual void seed( int32_t iSeed )=0;
virtual int32_t rand()=0;
virtual inline int32_t rand( int32_t iMax ) {
return rand( 0, iMax );
}
virtual inline int32_t rand( int32_t iMin, int32_t iMax ) {
return iMin+(randNorm()*(iMax-iMin));
}
virtual inline double randNorm() {
return (((uint32_t)rand())&0xfffffffeul)*0x1.00000001p-32;
// return (((uint32_t)rand())&0xfffffffeul)/(double)(0xfffffffful);
}
};
};
#endif
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