Two Tuples ( two_tuple )

Definition

An instance p of type two_tuple<A,B> is a two-tuple (a, b) of variables of types A, and B, respectively.

Related types are two_tuple, three_tuple, and four_tuple.

#include < LEDA/core/tuple.h >

Types

two_tuple<A,B>::first_type	the type of the first component.
two_tuple<A,B>::second_type	the type of the second component.

Creation

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

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.
template <class A, class B>
bool	const two_tuple<A,B>& p == const two_tuple<A,B>& q
		equality test for two_tuples. Each of the component types must have an equality operator.
template <class A, class B>
int	compare(const two_tuple<A,B>& p, const two_tuple<A,B>& q)
		lexicographic ordering for two_tuples. Each of the component types must have a compare function.
template <class A, class B>
int	Hash(const two_tuple<A,B>& p)
		hash function for two_tuples. Each of the component types must have a Hash function.

Implementation

The obvious implementation is used.