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50 lines (42 loc) · 2.03 KB
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/*----------------------------------------------------------------------
File : random.h
Contents: random number generators
Author : Christian Borgelt
History : 2008.10.05 file created
----------------------------------------------------------------------*/
#ifndef __RANDOM__
#define __RANDOM__
#include <limits.h>
/*----------------------------------------------------------------------
Preprocessor Definitions
----------------------------------------------------------------------*/
#define RNG_XORSHIFT 0 /* generator based on xor and shift */
/*----------------------------------------------------------------------
Type Definitions
----------------------------------------------------------------------*/
typedef struct { /* --- random number generator --- */
int type; /* generator type */
unsigned int regs[1]; /* registers to store the state */
} RANDOM; /* (random number generator) */
/*----------------------------------------------------------------------
Global Variables
----------------------------------------------------------------------*/
extern RANDOM* rng_curr; /* current random number generator */
/*----------------------------------------------------------------------
Functions
----------------------------------------------------------------------*/
extern RANDOM* rng_create (int type, unsigned int *seeds);
extern unsigned int rng_uint (RANDOM *rng);
extern int rng_int (RANDOM *rng);
extern double rng_double (RANDOM *rng);
extern RANDOM* rng_get (void);
extern void rng_set (RANDOM *rng);
extern int rng_rand (void);
/*----------------------------------------------------------------------
Preprocessor Definitions
----------------------------------------------------------------------*/
#define rng_double(r) (rng_unit(r) /((double)UINT_MAX +1.0));
#define rng_get() (rng_curr)
#define rng_set(r) (rng_curr = (r))
#define rng_rand(r) rng_int(rng_curr)
#endif