Comparators.h
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1 /* Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.
2 
3  This file is part of the TerraLib - a Framework for building GIS enabled applications.
4 
5  TerraLib is free software: you can redistribute it and/or modify
6  it under the terms of the GNU Lesser General Public License as published by
7  the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  TerraLib is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU Lesser General Public License for more details.
14 
15  You should have received a copy of the GNU Lesser General Public License
16  along with TerraLib. See COPYING. If not, write to
17  TerraLib Team at <terralib-team@terralib.org>.
18  */
19 
20 /*!
21  \file terralib/common/Comparators.h
22 
23  \brief Several functor types for comparing objects.
24 
25  \ingroup common
26  */
27 
28 #ifndef __TERRALIB_COMMON_INTERNAL_COMPARATORS_H
29 #define __TERRALIB_COMMON_INTERNAL_COMPARATORS_H
30 
31 // STL
32 #include <cstring>
33 
34 namespace te
35 {
36  namespace common
37  {
38  /*!
39  \struct LessCmp
40 
41  \brief It implements several compare functions.
42  */
43  template<class T> struct LessCmp
44  {
45  /*!
46  \brief It compares two NULL terminated C-strings.
47 
48  \param f The first string.
49  \param s The second string.
50 
51  \return True if the first string comes first in lexicographic order.
52  */
53  bool operator()(const T& f, const T& s) const
54  {
55  return f < s;
56  }
57  };
58 
59  /*!
60  \struct LessCmp
61 
62  \brief It implements several compare functions.
63  */
64  template<class T> struct LessCmp<T*>
65  {
66  /*!
67  \brief It compares two NULL terminated C-strings.
68 
69  \param f The first string.
70  \param s The second string.
71 
72  \return True if the first string comes first in lexicographic order.
73  */
74  bool operator()(const T* f, const T* s) const
75  {
76  return *f < *s;
77  }
78  };
79 
80  /*!
81  \struct LessCmp
82 
83  \brief It implements several compare functions.
84  */
85  template<> struct LessCmp<const char*>
86  {
87  /*!
88  \brief It compares two NULL terminated C-strings.
89 
90  \param f The first string.
91  \param s The second string.
92 
93  \return True if the first string comes first in lexicographic order.
94  */
95  bool operator()(const char* f, const char* s) const
96  {
97  return (strcmp(f, s) < 0 ? true : false);
98  }
99  };
100  } // end namespace common
101 } // end namespace te
102 
103 #endif // __TERRALIB_COMMON_INTERNAL_COMPARATORS_H
104 
bool operator()(const T &f, const T &s) const
It compares two NULL terminated C-strings.
Definition: Comparators.h:53
URI C++ Library.
It implements several compare functions.
Definition: Comparators.h:43
bool operator()(const T *f, const T *s) const
It compares two NULL terminated C-strings.
Definition: Comparators.h:74
bool operator()(const char *f, const char *s) const
It compares two NULL terminated C-strings.
Definition: Comparators.h:95