CGAL 6.1 - STL Extensions for CGAL

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List of all members | Public Member Functions
CGAL::Triple< T1, T2, T3 > Class Template Reference
Reference Manual » Utilities

`#include <CGAL/utility.h>`

## Definition

template<typename T1, typename T2, typename T3>
class CGAL::Triple< T1, T2, T3 >

The Triple class is an extension of `std::pair`.

`Triple` is a heterogeneous triple: it holds one object of type `T1`, one of type `T2`, and one of type `T3`. A `Triple` is much like a container, in that it "owns" its elements. It is not actually a model of container, though, because it does not support the standard methods (such as iterators) for accessing the elements of a container.

`std::tuple` or `std::array` instead for new uses.

Requirements

`T1`, `T2` and `T3` must be `Assignable`. Additional operations have additional requirements.

## Public Member Functions
template<class T1 , class T2 , class T3 >
bool | operator< (Triple< T1, T2, T3 > x, Triple< T1, T2, T3 > y)
| The comparison operator.
template<class T1 , class T2 , class T3 >
bool | operator== (Triple< T1, T2, T3 > x, Triple< T1, T2, T3 > y)
| The equality operator.

## Types
typedef T1 | first_type
typedef T2 | second_type
typedef T3 | third_type

## Variables
T1 | first
| first element.
T2 | second
| second element.
T3 | third
| third element.

## Creation
| Triple ()
| introduces a triple using the default constructor of the three elements.
| Triple (T1 x, T2 y, T3 z)
| constructs a triple such that `first` is constructed from `x`, `second` is constructed from `y`, and `third` is constructed from `z`.
template<class U , class V , class W >
| Triple (U u, V v, W w)
| constructs a triple such that `first` is constructed from `u`, `second` is constructed from `v`, and `third` is constructed from `w`.
template<int i>
T | get ()
| Gives access to `first`, `second` or `third` whenever `i` is 0, 1 or 2, via a, potentially const, reference.

## Constructor & Destructor Documentation

## ◆ Triple()

template<typename T1 , typename T2 , typename T3 >
template<class U , class V , class W >

CGAL::Triple< T1, T2, T3 >::Triple | ( | U | u,
|  | V | v,
|  | W | w
| ) |  |

constructs a triple such that `first` is constructed from `u`, `second` is constructed from `v`, and `third` is constructed from `w`.

Proper conversion operators must exist from `U` to `T1`, `V` to `T2`, and `W` to `T3`.

## Member Function Documentation

## ◆ get()

template<typename T1 , typename T2 , typename T3 >
template<int i>

T CGAL::Triple< T1, T2, T3 >::get | ( |  | ) |

Gives access to `first`, `second` or `third` whenever `i` is 0, 1 or 2, via a, potentially const, reference.

Note: `T` stands for `T1`, `T2` or `T3` depending on `i`.

## ◆ operator<()

template<typename T1 , typename T2 , typename T3 >
template<class T1 , class T2 , class T3 >

bool CGAL::Triple< T1, T2, T3 >::operator< | ( | Triple< T1, T2, T3 > | x,
|  | Triple< T1, T2, T3 > | y
| ) |  |

The comparison operator.

It uses lexicographic comparison: the return value is true if the first element of `x` is less than the first element of `y`, and false if the first element of `y` is less than the first element of `x`. If neither of these is the case, then it returns true if the second element of `x` is less than the second element of `y`, and false if the second element of `y` is less than the second element of `x`. If neither of these is the case, then it returns the result of comparing the third elements of `x` and `y`. This operator may only be used if `T1`, `T2` and `T3` define the comparison operator.

## ◆ operator==()

template<typename T1 , typename T2 , typename T3 >
template<class T1 , class T2 , class T3 >

bool CGAL::Triple< T1, T2, T3 >::operator== | ( | Triple< T1, T2, T3 > | x,
|  | Triple< T1, T2, T3 > | y
| ) |  |

The equality operator.

The return value is true if and only the first elements of `x` and `y` are equal, the second elements of `x` and `y` are equal, and the third elements of `x` and `y` are equal. This operator may only be used if `T1`, `T2` and `T3` define the equality operator.

## Member Data Documentation

## ◆ first

template<typename T1 , typename T2 , typename T3 >

T1 CGAL::Triple< T1, T2, T3 >::first

first element.

Please access it using `get<0>()`.

## ◆ second

template<typename T1 , typename T2 , typename T3 >

T2 CGAL::Triple< T1, T2, T3 >::second

second element.

Please access it using `get<1>()`.

## ◆ third

template<typename T1 , typename T2 , typename T3 >

T3 CGAL::Triple< T1, T2, T3 >::third

third element.

Please access it using `get<2>()`.