CGAL::Gmpq Class Reference

#include <CGAL/Gmpq.h>

Definition

An object of the class Gmpq is an arbitrary precision rational number based on the Gmp library.

Is Model Of:

Field

RealEmbeddable

Fraction

Implementation

Gmpqs are reference counted.

Related Functions
(Note that these are not member functions.)
std::ostream &	operator<< (std::ostream &out, const Gmpq &q)
	writes q to the ostream out, in the form n/d.
std::istream &	operator>> (std::istream &in, Gmpq &q)
	reads a number from in, then converts it to a Gmpq. More...

Creation
	Gmpq ()
	creates an uninitialized Gmpq q.
	Gmpq (int i)
	creates a Gmpq initialized with i.
	Gmpq (Gmpz n)
	creates a Gmpq initialized with n.
	Gmpq (Gmpfr f)
	creates a Gmpq initialized with f.
	Gmpq (int n, int d)
	creates a Gmpq initialized with n/d.
	Gmpq (signed long n, unsigned long d)
	creates a Gmpq initialized with n/d.
	Gmpq (unsigned long n, unsigned long d)
	creates a Gmpq initialized with n/d.
	Gmpq (Gmpz n, Gmpz d)
	creates a Gmpq initialized with n/d.
	Gmpq (double d)
	creates a Gmpq initialized with d.
	Gmpq (const std::string &str)
	creates a Gmpq initialized with str, which can be an integer like "41" or a fraction like "41/152". More...
	Gmpq (const std::string &str, int base)
	creates a Gmpq initialized with str in base base, which is an integer between 2 and 62. More...

Operations
There are two access functions, namely to the numerator and the denominator of a rational. Note that these values are not uniquely defined. It is guaranteed that q.numerator() and q.denominator() return values nt_num and nt_den such that q = nt_num/nt_den, only if q.numerator() and q.denominator() are called consecutively wrt. q, i.e. q is not involved in any other operation between these calls.
Gmpz	numerator () const
	returns the numerator of q.
Gmpz	denominator () const
	returns the denominator of q.

Constructor & Destructor Documentation

Gmpq() [1/2]

CGAL::Gmpq::Gmpq

(

const std::string &

str

)

creates a Gmpq initialized with str, which can be an integer like "41" or a fraction like "41/152".

White space is allowed in the string, and ignored.

Gmpq() [2/2]

CGAL::Gmpq::Gmpq	(	const std::string &	str,
		int	base
	)

creates a Gmpq initialized with str in base base, which is an integer between 2 and 62.

White space in the string is ignored.

Friends And Related Function Documentation

operator>>()

std::istream & operator>> ( std::istream &  in, Gmpq &  q  )

related

reads a number from in, then converts it to a Gmpq.

The number may be an integer, a rational number in the form n/d, or a floating-point number.