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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
|
#ifndef INCLUDED_HASHCLASSES_H_
#define INCLUDED_HASHCLASSES_H_
#include <string>
#include <cctype>
/*
Note that with the Gnu g++ compiler 3.2 (and beyond?) the ext/ header
uses the __gnu_cxx namespace for symbols defined in these header files.
When using compilers before version 3.2, do:
#define __gnu_cxx std
before including this file to circumvent problems that may occur
because of these namespace conventions which were not yet used in versions
before 3.2.
*/
#include <ext/hash_map>
#include <algorithm>
/*
This file is copyright (c) GPL, 2001-2004
==========================================
august 2004: redundant include guards removed
october 2002: provisions for using the hashclasses with the g++ 3.2
compiler were incorporated.
april 2002: namespace FBB introduced
abbreviated class templates defined,
see the END of this comment section for examples of how
to use these abbreviations.
jan 2002: redundant include guards added,
required header files adapted,
for_each() rather than transform() used
With hash_maps using char const * for the keys:
============
* Use `HashCharPtr' as 3rd template argument for case-sensitive keys
* Use `HashCaseCharPtr' as 3rd template argument for case-insensitive
keys
* Use `EqualCharPtr' as 4th template argument for case-sensitive keys
* Use `EqualCaseCharPtr' as 4th template argument for case-insensitive
keys
With hash_maps using std::string for the keys:
===========
* Use `HashString' as 3rd template argument for case-sensitive keys
* Use `HashCaseString' as 3rd template argument for case-insensitive keys
* OMIT the 4th template argument for case-sensitive keys
* Use `EqualCaseString' as 4th template argument for case-insensitive
keys
Examples, using int as the value type. Any other type can be used instead
for the value type:
// key is char const *, case sensitive
__gnu_cxx::hash_map<char const *, int, FBB::HashCharPtr,
FBB::EqualCharPtr >
hashtab;
// key is char const *, case insensitive
__gnu_cxx::hash_map<char const *, int, FBB::HashCaseCharPtr,
FBB::EqualCaseCharPtr >
hashtab;
// key is std::string, case sensitive
__gnu_cxx::hash_map<std::string, int, FBB::HashString>
hashtab;
// key is std::string, case insensitive
__gnu_cxx::hash_map<std::string, int, FBB::HashCaseString,
FBB::EqualCaseString>
hashtab;
Instead of the above full typedeclarations, the following shortcuts should
work as well:
FBB::CharPtrHash<int> // key is char const *, case sensitive
hashtab;
FBB::CharCasePtrHash<int> // key is char const *, case insensitive
hashtab;
FBB::StringHash<int> // key is std::string, case sensitive
hashtab;
FBB::StringCaseHash<int> // key is std::string, case insensitive
hashtab;
With these template types iterators and other map-members are also
available. E.g.,
--------------------------------------------------------------------------
extern FBB::StringHash<int> dh;
for (FBB::StringHash<int>::iterator it = dh.begin(); it != dh.end(); it++)
std::cout << it->first << " - " << it->second << '\n';
--------------------------------------------------------------------------
Feb. 2001 - April 2002
Frank B. Brokken (f.b.brokken@rug.nl)
*/
namespace FBB
{
class HashCharPtr
{
public:
size_t operator()(char const *str) const
{
return __gnu_cxx::hash<char const *>()(str);
}
};
class EqualCharPtr
{
public:
bool operator()(char const *x, char const *y) const
{
return !strcmp(x, y);
}
};
class HashCaseCharPtr
{
public:
size_t operator()(char const *str) const
{
std::string s = str;
for_each(s.begin(), s.end(), *this);
return __gnu_cxx::hash<char const *>()(s.c_str());
}
void operator()(char &c) const
{
c = tolower(c);
}
};
class EqualCaseCharPtr
{
public:
bool operator()(char const *x, char const *y) const
{
return !strcasecmp(x, y);
}
};
class HashString
{
public:
size_t operator()(std::string const &str) const
{
return __gnu_cxx::hash<char const *>()(str.c_str());
}
};
class HashCaseString: public HashCaseCharPtr
{
public:
size_t operator()(std::string const &str) const
{
return HashCaseCharPtr::operator()(str.c_str());
}
};
class EqualCaseString
{
public:
bool operator()(std::string const &s1, std::string const &s2) const
{
return !strcasecmp(s1.c_str(), s2.c_str());
}
};
template<typename Value>
class CharPtrHash: public
__gnu_cxx::hash_map<char const *, Value, HashCharPtr, EqualCharPtr >
{
public:
CharPtrHash()
{}
template <typename InputIterator>
CharPtrHash(InputIterator first, InputIterator beyond)
:
__gnu_cxx::hash_map<char const *, Value, HashCharPtr,
EqualCharPtr>(first, beyond)
{}
};
template<typename Value>
class CharCasePtrHash: public
__gnu_cxx::hash_map<char const *, Value, HashCaseCharPtr,
EqualCaseCharPtr >
{
public:
CharCasePtrHash()
{}
template <typename InputIterator>
CharCasePtrHash(InputIterator first, InputIterator beyond)
:
__gnu_cxx::hash_map<char const *, Value,
HashCaseCharPtr, EqualCaseCharPtr>
(first, beyond)
{}
};
template<typename Value>
class StringHash: public __gnu_cxx::hash_map<std::string, Value,
HashString>
{
public:
StringHash()
{}
template <typename InputIterator>
StringHash(InputIterator first, InputIterator beyond)
:
__gnu_cxx::hash_map<std::string, Value, HashString>
(first, beyond)
{}
};
template<typename Value>
class StringCaseHash: public
__gnu_cxx::hash_map<std::string, int, HashCaseString,
EqualCaseString>
{
public:
StringCaseHash()
{}
template <typename InputIterator>
StringCaseHash(InputIterator first, InputIterator beyond)
:
__gnu_cxx::hash_map<std::string,
int, HashCaseString,
EqualCaseString>(first, beyond)
{}
};
template<typename Key, typename Value>
class Hash: public
__gnu_cxx::hash_map<Key, Value,
__gnu_cxx::hash<Key>(),
equal<Key>())
{};
}
#endif
|
