Three Tuples ( three_tuple )

Definition

An instance p of type three_tuple<A,B,C> is a three-tuple (a, b, c) of variables of types A, B, and C, respectively.

Related types are two_tuple, three_tuple, and four_tuple.

#include < LEDA/tuple.h >

Types

three_tuple<A,B,C>::first_type	the type of the first component.
three_tuple<A,B,C>::second_type	the type of the second component.
three_tuple<A,B,C>::third_type	the type of the third component.

Creation

three_tuple<A,B,C>	p	creates an instance p of type three_tuple<A,B,C>. All components are initialized to their default value.
three_tuple<A,B,C>	p(A u, B v, C w)	creates an instance p of type three_tuple<A,B,C> and initializes it with the value (u, v, w).

Operations

A&	p.first()	returns the A-component of p. If p is a const-object the return type is A.
B&	p.second()	returns the B-component of p. If p is a const-object the return type is B.
C&	p.third()	returns the C-component of p. If p is a const-object the return type is C.
template <class A, class B, class C>
bool	p == q	equality test for three_tuples. Each of the component types must have an equality operator.
template <class A, class B, class C>
int	compare(three_tuple<A,B,C> p, three_tuple<A,B,C> q)
		lexicographic ordering for three_tuples. Each of the component types must have a compare function.
template <class A, class B, class C>
int	Hash(three_tuple<A,B,C> p)
		hash function for three_tuples. Each of the component types must have a Hash function.

Implementation

The obvious implementation is used.