CGAL::Gmpz Class Reference

#include <CGAL/Gmpz.h>

Definition

An object of the class Gmpz is an arbitrary precision integer based on the Gmp Library.

Is Model Of:

EuclideanRing

RealEmbeddable

Implementation

Gmpzs are reference counted.

Related Functions
(Note that these are not member functions.)
Gmpz	operator>> (const Gmpz &a, unsigned long i)
	rightshift by i.
Gmpz	operator<< (const Gmpz &a, unsigned long i)
	leftshift by i.
Gmpz	operator& (const Gmpz &a, const Gmpz &b)
	bitwise AND.
Gmpz	operator| (const Gmpz &a, const Gmpz &b)
	bitwise IOR.
Gmpz	operator^ (const Gmpz &a, const Gmpz &b)
	bitwise XOR.
std::ostream &	operator<< (std::ostream &out, const Gmpz &z)
	writes z to the ostream out.
std::istream &	operator>> (std::istream &in, Gmpz &z)
	reads an integer from in, then converts it to a Gmpz.

Creation
	Gmpz ()
	creates an uninitialized multiple precision integer z.
	Gmpz (int i)
	creates a multiple-precision integer initialized with i.
	Gmpz (double d)
	creates a multiple-precision integer initialized with the integral part of d.

Operations
Gmpz &	operator++ ()
	prefix increment.
Gmpz	operator++ (int)
	postfix increment.
Gmpz &	operator-- ()
	prefix decrement.
Gmpz	operator-- (int)
	postfix decrement.
Gmpz &	operator>>= (const long &i)
	rightshift by i, where i >= 0.
Gmpz &	operator<<= (const long &i)
	leftshift by i, where i >= 0.
Gmpz &	operator &= (const Gmpz &b)
	bitwise AND.
Gmpz &	operator|= (const Gmpz &b)
	bitwise IOR.
Gmpz &	operator^= (const Gmpz &b)
	bitwise XOR.
Sign	sign () const
	Returns the sign of z.
size_t	bit_size () const
	Returns the bit-size (that is, the number of bits needed to represent the mantissa) of z.
size_t	size () const
	Returns the size in limbs of z. More...
size_t	approximate_decimal_length () const
	Returns the approximate number of decimal digits needed to represent z. More...
double	to_double () const
	Returns a double approximation of z. More...

Member Function Documentation

approximate_decimal_length()

size_t CGAL::Gmpz::approximate_decimal_length

(

)

const

Returns the approximate number of decimal digits needed to represent z.

Approximate means either a correct result, either the correct result plus one.

size()

size_t CGAL::Gmpz::size

(

)

const

Returns the size in limbs of z.

A limb is the type used by Gmp to represent the integer (usually long).

to_double()

double CGAL::Gmpz::to_double

(

)

const

Returns a double approximation of z.

The integer is truncated if needed. If the exponent of the conversion is too big, the result is system dependent (returning infinity where it is supported).