CGAL 6.0  STL Extensions for CGAL

#include <CGAL/utility.h>
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.  
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
.
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
.
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.
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.
T1 CGAL::Triple< T1, T2, T3 >::first 
first element.
Please access it using get<0>()
.
T2 CGAL::Triple< T1, T2, T3 >::second 
second element.
Please access it using get<1>()
.
T3 CGAL::Triple< T1, T2, T3 >::third 
third element.
Please access it using get<2>()
.