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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.


next up previous contents index
Next: Three Tuples ( three_tuple Up: Simple Data Types and Previous: Counter ( counter )   Contents   Index
root 2008-01-09