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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* Copyright (c) 2020 Kohei Yoshida
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
************************************************************************/
#ifdef NDEBUG
#undef NDEBUG
#endif
#include <cassert>
#include <iostream>
#include <fstream>
#include <mdds/trie_map.hpp>
//!code-start: value-type
enum affiliated_party_t : uint8_t
{
unaffiliated = 0,
federalist,
democratic_republican,
democratic,
whig,
republican,
national_union,
republican_national_union,
};
struct us_president
{
uint16_t year;
affiliated_party_t party;
};
//!code-end: value-type
std::ostream& operator<< (std::ostream& os, affiliated_party_t v)
{
static const char* names[] = {
"Unaffiliated",
"Federalist",
"Democratic Republican",
"Democratic",
"Whig",
"Republican",
"National Union",
"Republican / National Union",
};
os << names[v];
return os;
}
bool operator== (const us_president& left, const us_president& right)
{
return left.year == right.year && left.party == right.party;
}
//!code-start: custom-serializer
struct us_president_serializer
{
union bin_buffer
{
char buffer[2];
uint16_t i16;
affiliated_party_t party;
};
static constexpr bool variable_size = false;
static constexpr std::size_t value_size = 3;
static void write(std::ostream& os, const us_president& v)
{
bin_buffer buf;
// Write the year value first.
buf.i16 = v.year;
os.write(buf.buffer, 2);
// Write the affiliated party value.
buf.party = v.party;
os.write(buf.buffer, 1);
}
static void read(std::istream& is, std::size_t n, us_president& v)
{
// For a fixed-size value type, this should equal the defined value size.
assert(n == 3);
bin_buffer buf;
// Read the year value.
is.read(buf.buffer, 2);
v.year = buf.i16;
// Read the affiliated party value.
is.read(buf.buffer, 1);
v.party = buf.party;
}
};
//!code-end: custom-serializer
int main() try
{
//!code-start: trie-type
using map_type = mdds::packed_trie_map<std::string, us_president>;
//!code-end: trie-type
// source: https://en.wikipedia.org/wiki/List_of_presidents_of_the_United_States
//
// The entries must be sorted by the keys.
//!code-start: entries
std::vector<map_type::entry> entries =
{
{ MDDS_ASCII("Abraham Lincoln"), { 1861, republican_national_union } },
{ MDDS_ASCII("Andrew Jackson"), { 1829, democratic } },
{ MDDS_ASCII("Andrew Johnson"), { 1865, national_union } },
{ MDDS_ASCII("Barack Obama"), { 2009, democratic } },
{ MDDS_ASCII("Benjamin Harrison"), { 1889, republican } },
{ MDDS_ASCII("Bill Clinton"), { 1993, democratic } },
{ MDDS_ASCII("Calvin Coolidge"), { 1923, republican } },
{ MDDS_ASCII("Chester A. Arthur"), { 1881, republican } },
{ MDDS_ASCII("Donald Trump"), { 2017, republican } },
{ MDDS_ASCII("Dwight D. Eisenhower"), { 1953, republican } },
{ MDDS_ASCII("Franklin D. Roosevelt"), { 1933, democratic } },
{ MDDS_ASCII("Franklin Pierce"), { 1853, democratic } },
{ MDDS_ASCII("George H. W. Bush"), { 1989, republican } },
{ MDDS_ASCII("George W. Bush"), { 2001, republican } },
{ MDDS_ASCII("George Washington"), { 1789, unaffiliated } },
{ MDDS_ASCII("Gerald Ford"), { 1974, republican } },
{ MDDS_ASCII("Grover Cleveland 1"), { 1885, democratic } },
{ MDDS_ASCII("Grover Cleveland 2"), { 1893, democratic } },
{ MDDS_ASCII("Harry S. Truman"), { 1945, democratic } },
{ MDDS_ASCII("Herbert Hoover"), { 1929, republican } },
{ MDDS_ASCII("James A. Garfield"), { 1881, republican } },
{ MDDS_ASCII("James Buchanan"), { 1857, democratic } },
{ MDDS_ASCII("James K. Polk"), { 1845, democratic } },
{ MDDS_ASCII("James Madison"), { 1809, democratic_republican } },
{ MDDS_ASCII("James Monroe"), { 1817, democratic_republican } },
{ MDDS_ASCII("Jimmy Carter"), { 1977, democratic } },
{ MDDS_ASCII("John Adams"), { 1797, federalist } },
{ MDDS_ASCII("John F. Kennedy"), { 1961, democratic } },
{ MDDS_ASCII("John Quincy Adams"), { 1825, democratic_republican } },
{ MDDS_ASCII("John Tyler"), { 1841, whig } },
{ MDDS_ASCII("Lyndon B. Johnson"), { 1963, democratic } },
{ MDDS_ASCII("Martin Van Buren"), { 1837, democratic } },
{ MDDS_ASCII("Millard Fillmore"), { 1850, whig } },
{ MDDS_ASCII("Richard Nixon"), { 1969, republican } },
{ MDDS_ASCII("Ronald Reagan"), { 1981, republican } },
{ MDDS_ASCII("Rutherford B. Hayes"), { 1877, republican } },
{ MDDS_ASCII("Theodore Roosevelt"), { 1901, republican } },
{ MDDS_ASCII("Thomas Jefferson"), { 1801, democratic_republican } },
{ MDDS_ASCII("Ulysses S. Grant"), { 1869, republican } },
{ MDDS_ASCII("Warren G. Harding"), { 1921, republican } },
{ MDDS_ASCII("William Henry Harrison"), { 1841, whig } },
{ MDDS_ASCII("William Howard Taft"), { 1909, republican } },
{ MDDS_ASCII("William McKinley"), { 1897, republican } },
{ MDDS_ASCII("Woodrow Wilson"), { 1913, democratic } },
{ MDDS_ASCII("Zachary Taylor"), { 1849, whig } },
};
//!code-end: entries
//!code-start: inst
map_type us_presidents(entries.data(), entries.size());
//!code-end: inst
//!code-start: print-n-entries
std::cout << "Number of entries: " << us_presidents.size() << std::endl;
//!code-end: print-n-entries
std::cout << std::endl;
{
//!code-start: save-state
std::ofstream outfile("us-presidents.bin", std::ios::binary);
us_presidents.save_state<us_president_serializer>(outfile);
//!code-end: save-state
}
//!code-start: load-state
map_type us_presidents_loaded;
std::ifstream infile("us-presidents.bin", std::ios::binary);
us_presidents_loaded.load_state<us_president_serializer>(infile);
//!code-end: load-state
std::ios_base::fmtflags origflags = std::cout.flags();
//!code-start: compare
std::cout << "Equal to the original? " << std::boolalpha << (us_presidents == us_presidents_loaded) << std::endl;
//!code-end: compare
std::cout.setf(origflags);
std::cout << std::endl;
//!code-start: search-john
std::cout << "Presidents whose first name is 'John':" << std::endl;
auto results = us_presidents_loaded.prefix_search("John");
for (const auto& entry : results)
std::cout << " * " << entry.first << " (" << entry.second.year << "; " << entry.second.party << ")" << std::endl;
//!code-end: search-john
return EXIT_SUCCESS;
}
catch (...)
{
return EXIT_FAILURE;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
