stringlessignorecase.h
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1 /*
2  * Copyright (C) 2003 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
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11  * instantiate templates or use macros or inline functions from this
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22  * Lesser General Public License for more details.
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27  */
28 
29 
30 #ifndef TNT_STRINGLESSIGNORECASE_H
31 #define TNT_STRINGLESSIGNORECASE_H
32 
33 #include <string>
34 #include <functional>
35 #include <cctype>
36 
37 namespace tnt
38 {
39  template <typename stringType>
40  int StringCompareIgnoreCase(const stringType& s1, const stringType& s2)
41  {
42  typename stringType::const_iterator it1 = s1.begin();
43  typename stringType::const_iterator it2 = s2.begin();
44  while (it1 != s1.end() && it2 != s2.end())
45  {
46  if (*it1 != *it2)
47  {
48  char c1 = std::toupper(*it1);
49  char c2 = std::toupper(*it2);
50  if (c1 < c2)
51  return -1;
52  else if (c2 < c1)
53  return 1;
54  }
55  ++it1;
56  ++it2;
57  }
58 
59  return it1 == s1.end() ? (it2 != s2.end()) ? -1 : 0
60  : 1;
61  }
62 
63  template <>
64  int StringCompareIgnoreCase<const char*>(const char* const& s1, const char* const& s2);
65 
66  inline int StringCompareIgnoreCase(const std::string& s1, const std::string& s2)
67  {
68  return StringCompareIgnoreCase<std::string>(s1, s2);
69  }
70 
71  template <typename stringType = std::string>
72  class StringLessIgnoreCase : public std::binary_function<stringType, stringType, bool>
73  {
74  public:
75  bool operator()(const stringType& s1, const stringType& s2) const
76  { return StringCompareIgnoreCase(s1, s2) < 0; }
77  };
78 
79 }
80 
81 #endif // TNT_STRINGLESSIGNORECASE_H
82