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/* Declarations of random_deviate routines for mpfr_erandom and mpfr_nrandom.
Copyright 2013 Free Software Foundation, Inc.
Contributed by Charles Karney <charles@karney.com>, SRI International.
This file is part of the GNU MPFR Library.
The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The GNU MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#if !defined(MPFR_RANDOM_DEVIATE_H)
#define MPFR_RANDOM_DEVIATE_H 1
#include "mpfr-impl.h"
#if defined(__cplusplus)
extern "C" {
#endif
/* This should be an unsigned type with a width of at least 32 and capable of
* representing at least 2*MPFR_PREC_MAX. This is used to count the bits in
* the fraction of a mpfr_random_deviate_t. See the checks made on this type
* in random_deviate_generate. */
typedef unsigned long mpfr_random_size_t;
typedef struct {
mpfr_random_size_t e; /* total bits in the fraction */
unsigned long h; /* the high W bits of the fraction */
mpz_t f; /* the rest of the fraction */
} mpfr_random_deviate_t[1];
/* allocate and set to (0,1) */
void mpfr_random_deviate_init(mpfr_random_deviate_t x);
/* reset to (0,1) */
void mpfr_random_deviate_reset(mpfr_random_deviate_t x);
/* deallocate */
void mpfr_random_deviate_clear(mpfr_random_deviate_t x);
/* swap two random deviates */
void mpfr_random_deviate_swap(mpfr_random_deviate_t x,
mpfr_random_deviate_t y);
/* return kth bit of fraction, representing 2^-k */
int mpfr_random_deviate_tstbit(mpfr_random_deviate_t x, mpfr_random_size_t k,
gmp_randstate_t r);
/* compare two random deviates, x < y */
int mpfr_random_deviate_less(mpfr_random_deviate_t x,
mpfr_random_deviate_t y,
gmp_randstate_t r);
/* set mpfr_t z = (neg ? -1 : 1) * (n + x) */
int mpfr_random_deviate_value(int neg, unsigned long n,
mpfr_random_deviate_t x, mpfr_t z,
gmp_randstate_t r, mpfr_rnd_t rnd);
#if defined(__cplusplus)
}
#endif
#endif
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