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use boost::ordered_field_operators1 

modular arithmetic needs ieee double precision
This commit is contained in:
Michael Hemmer 2008-04-28 11:31:48 +00:00
parent 97b300b576
commit e42a22537a
3 changed files with 89 additions and 82 deletions
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115
Modular_arithmetic/include/CGAL/Modular_arithmetic/Modular_type.h
View File

@ -27,14 +27,19 @@
CGAL_BEGIN_NAMESPACE
namespace CGALi{
struct Modular_arithmetic_needs_ieee_double_precision{
Modular_arithmetic_needs_ieee_double_precision(){
CGAL::force_ieee_double_precision();
}
};
}
class Modular;
Modular operator + (const Modular&);
Modular operator - (const Modular&);
Modular operator + (const Modular&, const Modular&);
Modular operator - (const Modular&, const Modular&);
Modular operator * (const Modular&, const Modular&);
Modular operator / (const Modular&, const Modular&);
std::ostream& operator << (std::ostream& os, const Modular& p);
std::istream& operator >> (std::istream& is, Modular& p);
@ -50,14 +55,18 @@ std::istream& operator >> (std::istream& is, Modular& p);
*
* \see Modular_traits
*/
class Modular{
class Modular:
boost::ordered_field_operators1< Modular,
boost::ordered_field_operators2< Modular, int > >{
public:
typedef Modular Self;
typedef Modular NT;
private:
static const double CST_CUT;
static const CGALi::Modular_arithmetic_needs_ieee_double_precision
modular_arithmetic_needs_ieee_double_precision;
private:
static int prime_int;
@ -201,28 +210,40 @@ public:
x() = MOD_add(x(),p2.x());
return (*this);
}
Self& operator -= (const Self& p2){
x() = MOD_add(x(),MOD_negate(p2.x()));
return (*this);
}
Self& operator *= (const Self& p2){
x() = MOD_mul(x(),p2.x());
return (*this);
}
Self& operator /= (const Self& p2) {
x() = MOD_div(x(),p2.x());
return (*this);
}
//
Self& operator += (int p2) {
x() = MOD_add(x(),Modular(p2).x());
return (*this);
}
Self& operator -= (int p2){
x() = MOD_add(x(),Modular(-p2).x());
return (*this);
}
Self& operator *= (int p2){
x() = MOD_mul(x(),Modular(p2).x());
return (*this);
}
Self& operator /= (int p2) {
x() = MOD_div(x(),Modular(p2).x());
return (*this);
}
friend Self operator + (const Self&);
friend Self operator - (const Self&);
friend Self operator + (const Self&, const Self&);
friend Self operator - (const Self&, const Self&);
friend Self operator * (const Self&, const Self&);
friend Self operator / (const Self& p1, const Self& p2);
friend Self operator - (const Self&);
};
inline Modular operator + (const Modular& p1)
@ -235,68 +256,17 @@ inline Modular operator - (const Modular& p1){
return r;
}
inline Modular operator + (const Modular& p1,const Modular& p2) {
typedef Modular MOD;
Modular r;
r.x() = MOD::MOD_add(p1.x(),p2.x());
return r;
}
inline Modular operator - (const Modular& p1, const Modular& p2) {
return p1+(-p2);
}
inline Modular operator * (const Modular& p1, const Modular& p2) {
typedef Modular MOD;
Modular r;
r.x() = MOD::MOD_mul(p1.x(),p2.x());
return r;
}
inline Modular operator / (const Modular& p1, const Modular& p2) {
typedef Modular MOD;
Modular r;
r.x() = MOD::MOD_div(p1.x(),p2.x());
return r;
}
inline bool operator == (const Modular& p1, const Modular& p2)
{ return ( p1.x()==p2.x() ); }
inline bool operator == (const Modular& p1, int p2)
{ return ( p1 == Modular(p2) ); }
inline bool operator != (const Modular& p1, const Modular& p2)
{ return ( p1.x()!=p2.x() ); }
// left hand side
inline bool operator == (int num, const Modular& p)
{ return ( Modular(num) == p );}
inline bool operator != (int num, const Modular& p)
{ return ( Modular(num) != p );}
inline bool operator < (const Modular& p1, const Modular& p2)
{ return ( p1.x() < p2.x() ); }
inline bool operator < (const Modular& p1, int p2)
{ return ( p1.x() < Modular(p2).x() ); }
// right hand side
inline bool operator == (const Modular& p, int num)
{ return ( Modular(num) == p );}
inline bool operator != (const Modular& p, int num)
{ return ( Modular(num) != p );}
// left hand side
inline Modular operator + (int num, const Modular& p2)
{ return (Modular(num) + p2); }
inline Modular operator - (int num, const Modular& p2)
{ return (Modular(num) - p2); }
inline Modular operator * (int num, const Modular& p2)
{ return (Modular(num) * p2); }
inline Modular operator / (int num, const Modular& p2)
{ return (Modular(num)/p2); }
// right hand side
inline Modular operator + (const Modular& p1, int num)
{ return (p1 + Modular(num)); }
inline Modular operator - (const Modular& p1, int num)
{ return (p1 - Modular(num)); }
inline Modular operator * (const Modular& p1, int num)
{ return (p1 * Modular(num)); }
inline Modular operator / (const Modular& p1, int num)
{ return (p1 / Modular(num)); }
// I/O
inline std::ostream& operator << (std::ostream& os, const Modular& p) {
@ -305,7 +275,6 @@ inline std::ostream& operator << (std::ostream& os, const Modular& p) {
return os;
}
inline std::istream& operator >> (std::istream& is, Modular& p) {
typedef Modular MOD;
char ch;

19
Modular_arithmetic/src/CGAL/Modular_type.cpp
View File

@ -18,19 +18,22 @@
// Author(s) : Michael Hemmer
/*! \file CGAL/Modular.h
\brief Defines the class CGAL::Modular and CGAL::Modular_traits.
\brief Defines the class CGAL::Modular and CGAL::Modular_traits.
Provides the \c CGAL::Modular_traits specialization for the build in number
types.
Provides the \c CGAL::Modular_traits specialization for the build in number
types.
*/
#include <CGAL/Modular_arithmetic/Modular_type.h>
namespace CGAL{
int Modular::prime_int = 67111067;
double Modular::prime =67111067.0;
double Modular::prime_inv =1/67111067.0;
const double Modular::CST_CUT = std::ldexp( 3., 51 );
int Modular::prime_int = 67111067;
double Modular::prime =67111067.0;
double Modular::prime_inv =1/67111067.0;
const double Modular::CST_CUT = std::ldexp( 3., 51 );
const CGALi::Modular_arithmetic_needs_ieee_double_precision
Modular::modular_arithmetic_needs_ieee_double_precision
= CGALi::Modular_arithmetic_needs_ieee_double_precision();
}

37
Modular_arithmetic/test/Modular_arithmetic/Modular.cpp
View File

@ -9,6 +9,8 @@
#include <CGAL/Modular.h>
#include <CGAL/Test/_test_algebraic_structure.h>
#include <CGAL/Arithmetic_kernel.h>
#include <CGAL/number_utils.h>
int main()
{
@ -75,7 +77,40 @@ int main()
t=x; assert((x/5)==(4/y));
//cout << x << endl;
assert(7 == NT::set_current_prime(old_prime));
typedef CGAL::Arithmetic_kernel AK;
typedef AK::Integer Integer;
Integer int_x(7);
Integer prime(NT::get_current_prime());
CGAL::Modular mod_x(7);
for(int i = 0; i < 10000; i++){
assert(mod_x == CGAL::modular_image(int_x));
int_x *= int_x; int_x = CGAL::mod(int_x, prime);
mod_x *= mod_x;
assert(mod_x == CGAL::modular_image(int_x));
int_x += int_x; int_x = CGAL::mod(int_x, prime);
mod_x += mod_x;
assert(mod_x == CGAL::modular_image(int_x));
assert(mod_x == CGAL::modular_image(int_x));
int_x *= int_x; int_x = CGAL::mod(int_x, prime);
mod_x *= mod_x;
assert(mod_x == CGAL::modular_image(int_x));
int_x -= int_x; int_x = CGAL::mod(int_x, prime);
mod_x -= mod_x;
}
// CGAL::force_ieee_double_precision();
{
CGAL::Modular::set_current_prime(67111043);
CGAL::Modular x(-33546401);
CGAL::Modular y(23950928);
CGAL::Modular q = CGAL::integral_division(x,y);
assert(x == q*y);
}
}