#ifndef BLISS_BIGNUM_HH
#define BLISS_BIGNUM_HH
/*
Copyright (c) 2003-2015 Tommi Junttila
Released under the GNU Lesser General Public License version 3.
This file is part of bliss.
bliss 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, version 3 of the License.
bliss 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 bliss. If not, see <http://www.gnu.org/licenses/>.
*/
#if defined(BLISS_USE_GMP)
#include <gmp.h>
#endif
#include <cstdlib>
#include <cstdio>
#include "defs.hh"
namespace bliss_digraphs {
/**
* \brief A very simple class for big integers (or approximation of them).
*
* If the compile time flag BLISS_USE_GMP is set,
* then the GNU Multiple Precision Arithmetic library (GMP) is used to
* obtain arbitrary precision, otherwise "long double" is used to
* approximate big integers.
*/
/// Addition by Chris Jefferson, 16 Jan 2020, for use in GAP.
/// Store the size of the group as a list of integers, to be
/// multiplied together later.
#define BLISS_IN_GAP
#ifdef BLISS_IN_GAP
class BigNum
{
std::vector<int> v;
public:
/**
* Create a new big number and set it to zero.
*/
BigNum() { }
/**
* Destroy the number.
*/
~BigNum() { }
/**
* Set the number to \a n.
*/
void assign(const int n) { v.clear(); v.push_back(n); }
/**
* Multiply the number with \a n.
*/
void multiply(const int n) { v.push_back(n); }
/**
* Print the number in the file stream \a fp.
*/
size_t print(FILE* const fp) const {return fprintf(fp, "<big number>"); }
std::vector<int> get_mults() const {
return v;
}
};
#elif defined(BLISS_USE_GMP)
class BigNum
{
mpz_t v;
public:
/**
* Create a new big number and set it to zero.
*/
BigNum() {mpz_init(v); }
/**
* Destroy the number.
*/
~BigNum() {mpz_clear(v); }
/**
* Set the number to \a n.
*/
void assign(const int n) {mpz_set_si(v, n); }
/**
* Multiply the number with \a n.
*/
void multiply(const int n) {mpz_mul_si(v, v, n); }
/**
* Print the number in the file stream \a fp.
*/
size_t print(FILE* const fp) const {return mpz_out_str(fp, 10, v); }
};
#else
class BigNum
{
long double v;
public:
/**
* Create a new big number and set it to zero.
*/
BigNum(): v(0.0) {}
/**
* Set the number to \a n.
*/
void assign(const int n) {v = (long double)n; }
/**
* Multiply the number with \a n.
*/
void multiply(const int n) {v *= (long double)n; }
/**
* Print the number in the file stream \a fp.
*/
size_t print(FILE* const fp) const {return fprintf(fp, "%Lg", v); }
};
#endif
} //namespace bliss_digraphs
#endif
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