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