normal_double.h

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/*
 * Copyright (c) 2018 XLAB d.o.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef CIFER_NORMAL_DOUBLE_H
#define CIFER_NORMAL_DOUBLE_H
 
#include "cifer/sample/normal_cumulative.h"
#include "cifer/internal/errors.h"
 
typedef struct cfe_normal_double {
    cfe_normal nor;
    cfe_normal_cumulative sampler_cumu;    // normal_cumulative sampler used in the first part
    mpz_t k;                            // precomputed parameters used for sampling
    mpz_t twice_k;
} cfe_normal_double;
 
cfe_error cfe_normal_double_init(cfe_normal_double *s, mpf_t sigma, size_t n, mpf_t first_sigma);
 
void cfe_normal_double_free(cfe_normal_double *s);
 
void cfe_normal_double_sample(mpz_t res, cfe_normal_double *s);
 
void cfe_normal_double_sample_vec(cfe_vec *res, cfe_normal_double *s);
 
void cfe_normal_double_sample_mat(cfe_mat *res, cfe_normal_double *s);
 
#endif