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| -rw-r--r-- | example/packed_trie_state_custom.cpp | 212 |
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diff --git a/example/packed_trie_state_custom.cpp b/example/packed_trie_state_custom.cpp new file mode 100644 index 0000000..666074e --- /dev/null +++ b/example/packed_trie_state_custom.cpp @@ -0,0 +1,212 @@ +/* -*- 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. + * + ************************************************************************/ + +#include <iostream> +#include <fstream> +#include <mdds/trie_map.hpp> + +using std::cout; +using std::endl; + +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; +}; + +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; +} + +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 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, 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; + } +}; + +int main() try +{ + + using map_type = mdds::packed_trie_map<mdds::trie::std_string_traits, us_president>; + + // source: https://en.wikipedia.org/wiki/List_of_presidents_of_the_United_States + // + // The entries must be sorted by the keys. + + 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 } }, + }; + + map_type us_presidents(entries.data(), entries.size()); + cout << "Number of entries: " << us_presidents.size() << endl; + + cout << endl; + + { + std::ofstream outfile("us-presidents.bin", std::ios::binary); + us_presidents.save_state<us_president_serializer>(outfile); + } + + map_type us_presidents_loaded; + + { + std::ifstream infile("us-presidents.bin", std::ios::binary); + us_presidents_loaded.load_state<us_president_serializer>(infile); + } + + std::ios_base::fmtflags origflags = cout.flags(); + cout << "Equal to the original? " << std::boolalpha << (us_presidents == us_presidents_loaded) << endl; + cout.setf(origflags); + + cout << endl; + + cout << "Presidents whose first name is 'John':" << endl; + auto results = us_presidents_loaded.prefix_search("John"); + for (const auto& entry : results) + cout << " * " << entry.first << " (" << entry.second.year << "; " << entry.second.party << ")" << endl; + + return EXIT_SUCCESS; +} +catch (...) +{ + return EXIT_FAILURE; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ + |