#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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