source: source/ariba/overlay/modules/chord/detail/comparators.hpp@ 3690

Last change on this file since 3690 was 3690, checked in by mies, 16 years ago

Merged 20090512-mies-connectors changes r3472:r3689 into trunk.

File size: 2.7 KB
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1// [License]
2// The Ariba-Underlay Copyright
3//
4// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
5//
6// Institute of Telematics
7// UniversitÀt Karlsruhe (TH)
8// Zirkel 2, 76128 Karlsruhe
9// Germany
10//
11// Redistribution and use in source and binary forms, with or without
12// modification, are permitted provided that the following conditions are
13// met:
14//
15// 1. Redistributions of source code must retain the above copyright
16// notice, this list of conditions and the following disclaimer.
17// 2. Redistributions in binary form must reproduce the above copyright
18// notice, this list of conditions and the following disclaimer in the
19// documentation and/or other materials provided with the distribution.
20//
21// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND
22// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OF TELEMATICS OR
25// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33// The views and conclusions contained in the software and documentation
34// are those of the authors and should not be interpreted as representing
35// official policies, either expressed or implied, of the Institute of
36// Telematics.
37// [License]
38#ifndef COMPARATORS_HPP_
39#define COMPARATORS_HPP_
40
41/**
42 * TODO: Doc
43 *
44 * @author Sebastian Mies <mies@tm.uka.de>
45 */
46#include "distances.hpp"
47
48namespace comparators {
49
50using namespace distances;
51
52/// default compare operation
53struct default_compare {
54 template<typename T>
55 int operator ()(const T& x, const T& y) {
56 return x == y ? 0 : (x < y ? -1 : 1);
57 }
58};
59
60/// compares distances to a given center point
61template<class CenterType, class T, class Distance = default_distance,
62 class Compare = default_compare>
63class distance_compare {
64private:
65 CenterType center;
66 Distance distance;
67 Compare compare;
68
69public:
70 explicit distance_compare(CenterType center,
71 Distance distance = Distance(), Compare compare = Compare()) :
72 center(center), distance(distance), compare(compare) {
73 }
74
75 const CenterType get_center() const {
76 return center;
77 }
78
79 int operator ()(const T& x, const T& y) {
80 return compare(distance(center, x), distance(center, y));
81 }
82};
83
84}
85
86#endif /* COMPARATORS_HPP_ */
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