summaryrefslogtreecommitdiff
path: root/boost/geometry/policies/compare.hpp
blob: 7f32b7ab30bdaf4b84b63b3b1a63798414376fb2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
// Boost.Geometry (aka GGL, Generic Geometry Library)

// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.

// This file was modified by Oracle on 2017.
// Modifications copyright (c) 2017, Oracle and/or its affiliates.

// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle

// Use, modification and distribution is subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_GEOMETRY_POLICIES_COMPARE_HPP
#define BOOST_GEOMETRY_POLICIES_COMPARE_HPP


#include <cstddef>

#include <boost/geometry/strategies/compare.hpp>
#include <boost/geometry/util/math.hpp>


namespace boost { namespace geometry
{


/*!
\brief Less functor, to sort points in ascending order.
\ingroup compare
\details This functor compares points and orders them on x,
    then on y, then on z coordinate.
\tparam Point the geometry
\tparam Dimension the dimension to sort on, defaults to -1,
    indicating ALL dimensions. That's to say, first on x,
    on equal x-es then on y, etc.
    If a dimension is specified, only that dimension is considered
*/
template
<
    typename Point = void,
    int Dimension = -1
>
struct less
{
    typedef Point first_argument_type;
    typedef Point second_argument_type;
    typedef bool result_type;

    inline bool operator()(Point const& left, Point const& right) const
    {
        typedef typename strategy::compare::services::default_strategy
            <
                strategy::compare::less,
                Point, Point,
                Dimension
            >::type strategy_type;

        return strategy_type::apply(left, right);
    }
};

template <int Dimension>
struct less<void, Dimension>
{
    template <typename Point1, typename Point2>
    inline bool operator()(Point1 const& left, Point2 const& right) const
    {
        typedef typename strategy::compare::services::default_strategy
            <
                strategy::compare::less,
                Point1, Point2,
                Dimension
            >::type strategy_type;

        return strategy_type::apply(left, right);
    }
};


/*!
\brief Greater functor
\ingroup compare
\details Can be used to sort points in reverse order
\see Less functor
*/
template
<
    typename Point = void,
    int Dimension = -1
>
struct greater
{
    typedef Point first_argument_type;
    typedef Point second_argument_type;
    typedef bool result_type;

    bool operator()(Point const& left, Point const& right) const
    {
        typedef typename strategy::compare::services::default_strategy
            <
                strategy::compare::greater,
                Point, Point,
                Dimension
            >::type strategy_type;

        return strategy_type::apply(left, right);
    }
};

template <int Dimension>
struct greater<void, Dimension>
{
    template <typename Point1, typename Point2>
    bool operator()(Point1 const& left, Point2 const& right) const
    {
        typedef typename strategy::compare::services::default_strategy
            <
                strategy::compare::greater,
                Point1, Point2,
                Dimension
            >::type strategy_type;

        return strategy_type::apply(left, right);
    }
};


/*!
\brief Equal To functor, to compare if points are equal
\ingroup compare
\tparam Geometry the geometry
\tparam Dimension the dimension to compare on, defaults to -1,
    indicating ALL dimensions.
    If a dimension is specified, only that dimension is considered
*/
template
<
    typename Point,
    int Dimension = -1
>
struct equal_to
{
    typedef Point first_argument_type;
    typedef Point second_argument_type;
    typedef bool result_type;

    bool operator()(Point const& left, Point const& right) const
    {
        typedef typename strategy::compare::services::default_strategy
            <
                strategy::compare::equal_to,
                Point, Point,
                Dimension
            >::type strategy_type;

        return strategy_type::apply(left, right);
    }
};

template <int Dimension>
struct equal_to<void, Dimension>
{
    template <typename Point1, typename Point2>
    bool operator()(Point1 const& left, Point2 const& right) const
    {
        typedef typename strategy::compare::services::default_strategy
            <
                strategy::compare::equal_to,
                Point1, Point2,
                Dimension
            >::type strategy_type;

        return strategy_type::apply(left, right);
    }
};


}} // namespace boost::geometry


#endif // BOOST_GEOMETRY_POLICIES_COMPARE_HPP