CGAL 6.1 - Algebraic Foundations

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FractionTraits Concept Reference
Reference Manual » Concepts

## Definition

A model of `FractionTraits` is associated with a type `Type`.

In case the associated type is a `Fraction`, a model of `FractionTraits` provides the relevant functionality for decomposing and re-composing as well as the numerator and denominator type.

Has models
  `CGAL::Fraction_traits<T>`

See also
  `FractionTraits_::Decompose`
  `FractionTraits_::Compose`
  `FractionTraits_::CommonFactor`

## Types
typedef unspecified_type | Type
| The associated type.
typedef unspecified_type | Is_fraction
| Tag indicating whether the associated type is a fraction and can be decomposed into a numerator and denominator.
typedef unspecified_type | Numerator_type
| The type to represent the numerator.
typedef unspecified_type | Denominator_type
| The (simpler) type to represent the denominator.

## Functors
In case `Type` is not a `Fraction` all functors are `Null_functor`.
typedef unspecified_type | Compose
| A model of FractionTraits_::Compose.
typedef unspecified_type | Decompose
| A model of FractionTraits_::Decompose.
typedef unspecified_type | Common_factor
| A model of FractionTraits_::CommonFactor.

## Member Typedef Documentation

## ◆ Denominator_type

typedef unspecified_type FractionTraits::Denominator_type

The (simpler) type to represent the denominator.

This is undefined in case the associated type is not a fraction.

## ◆ Is_fraction

typedef unspecified_type FractionTraits::Is_fraction

Tag indicating whether the associated type is a fraction and can be decomposed into a numerator and denominator.

This is either `CGAL::Tag_true` or `CGAL::Tag_false`.

## ◆ Numerator_type

typedef unspecified_type FractionTraits::Numerator_type

The type to represent the numerator.

This is undefined in case the associated type is not a fraction.