\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - Algebraic Foundations

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Algebraic_foundations/fraction_traits.cpp
#include <CGAL/basic.h>
#include <CGAL/Fraction_traits.h>
#include <CGAL/IO/io.h>
#ifdef CGAL_USE_GMP
#include <CGAL/Gmpz.h>
#include <CGAL/Gmpq.h>
int main(){
typedef CGAL::Fraction_traits<CGAL::Gmpq> FT;
typedef FT::Numerator_type Numerator_type;
typedef FT::Denominator_type Denominator_type;
CGAL_static_assertion((boost::is_same<Numerator_type,CGAL::Gmpz>::value));
CGAL_static_assertion((boost::is_same<Denominator_type,CGAL::Gmpz>::value));
Numerator_type numerator;
Denominator_type denominator;
CGAL::Gmpq fraction(4,5);
FT::Decompose()(fraction,numerator,denominator);
CGAL::set_pretty_mode(std::cout);
std::cout << "decompose fraction: "<< std::endl;
std::cout << "fraction : " << fraction << std::endl;
std::cout << "numerator : " << numerator<< std::endl;
std::cout << "denominator: " << denominator << std::endl;
std::cout << "re-compose fraction: "<< std::endl;
fraction = FT::Compose()(numerator,denominator);
std::cout << "fraction : " << fraction << std::endl;
}
#else
int main(){ std::cout << "This examples needs GMP" << std::endl; }
#endif