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CGAL::Quadruple<T1, T2, T3, T4>

Definition

The Quadruple class is an extension of std::pair. Quadruple<T1, T2, T3, T4> is a heterogeneous quadruple: it holds one object of type T1, one of type T2, one of type T3, and one of type T4. A Quadruple<T1, T2, T3, T4> 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.

This class is NOT RECOMMENDED anymore. We recommend that you use boost::tuple or CGAL::array instead for new uses.

#include <CGAL/utility.h>

Requirements

T1, T2, T3 and T4 must be Assignable. Additional operations have additional requirements.

Types

typedef T1 first_type;
typedef T2 second_type;
typedef T3 third_type;
typedef T4 fourth_type;

Variables

T1 first; first element. Please access it using get<0>().
T2 second; second element. Please access it using get<1>().
T3 third; third element. Please access it using get<2>().
T4 fourth; fourth element. Please access it using get<3>().

Creation

Quadruple<T1, T2, T3, T4> t;
introduces a quadruple using the default constructor of the four elements.


Quadruple<T1, T2, T3, T4> t ( T1 x, T2 y, T3 z, T4 w);
constructs a quadruple such that first is constructed from x, second is constructed from y, third is constructed from z, and fourth is constructed from w.


template <class U, class V, class W, class X>
Quadruple<T1, T2, T3, T4> t ( U u, V v, W w, X x);
constructs a quadruple such that first is constructed from u, second is constructed from v, third is constructed from w, and fourth is constructed from x.
Requirement: Proper conversion operators exist from U to T1, V to T2, W to T3, and X to T4.

template <int i>
T t.get () Gives access to first, second, third or fourth whenever i is 0, 1, 2 or 3, via a, potentially const, reference. Note: T stands for T1, T2, T3 or T4 depending on i.

template <class T1, class T2, class T3, class T4>
bool x < 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 true if the third element of x is less than the third element of y, and false if the third element of y is less than the third element of x. If neither of these is the case, then it returns the result of comparing the fourth elements of x and y. This operator may only be used if T1, T2, T3, and T4 define the comparison operator.

template <class T1, class T2, class T3, class T4>
bool x == 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, the third elements of x and y are equal, and the fourth elements of x and y are equal. This operator may only be used if T1, T2, T3, and T4 define the equality operator.

template <class T1, class T2, class T3, class T4>
Quadruple<T1, T2, T3, T4> make_quadruple ( T1 x, T2 y, T3 z, T4 w)
Equivalent to Quadruple<T1, T2, T3, T4>(x, y, z, w).

template <class T1, class T2, class T3, class T4>
Quadruple<T1, T2, T3, T4> make_tuple ( T1 x, T2 y, T3 z, T4 w)
Equivalent to Quadruple<T1, T2, T3, T4>(x, y, z, w).

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CGAL Open Source Project. Release 3.4. 22 January 2009.