// -*- C++ -*- // Copyright (C) 2005, 2006 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the terms // of the GNU General Public License as published by the Free Software // Foundation; either version 2, or (at your option) any later // version. // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // General Public License for more details. // You should have received a copy of the GNU General Public License // along with this library; see the file COPYING. If not, write to // the Free Software Foundation, 59 Temple Place - Suite 330, Boston, // MA 02111-1307, USA. // As a special exception, you may use this file as part of a free // software library without restriction. Specifically, if other files // instantiate templates or use macros or inline functions from this // file, or you compile this file and link it with other files to // produce an executable, this file does not by itself cause the // resulting executable to be covered by the GNU General Public // License. This exception does not however invalidate any other // reasons why the executable file might be covered by the GNU General // Public License. // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. // Permission to use, copy, modify, sell, and distribute this software // is hereby granted without fee, provided that the above copyright // notice appears in all copies, and that both that copyright notice // and this permission notice appear in supporting documentation. None // of the above authors, nor IBM Haifa Research Laboratories, make any // representation about the suitability of this software for any // purpose. It is provided "as is" without express or implied // warranty. /** * @file trie_split_example.cpp * A basic example showing how to split trie-based container objects. */ /** * This example shows how to split trie based containers, i.e., the opposite * of a join operation. */ #include <string> #include <cassert> #include <ext/pb_ds/assoc_container.hpp> using namespace std; using namespace pb_ds; int main() { // A PATRICIA trie table mapping strings to chars. typedef trie<string, char> map_type; // A map_type object. map_type r; // Inserts some entries into r. for (int i = 0; i < 100; ++ i) r.insert(make_pair(string(i, 'a'), 'b')); // Now split r into a different map_type object. // larger_r will hold the larger values following the split. map_type larger_r; // Split all elements with key larger than 'a'^1000 into larger_r. // This is exception free. r.split(string(1000, 'a'), larger_r); // Since there were no elements with key larger than 'a'^1000, r // should be unchanged. assert(r.size() == 100); assert(r.begin()->first == string("")); // Now perform a split which actually changes the content of r. // Split all elements with key larger than "aaa" into larger_r. r.split(string("aaa"), larger_r); assert(r.size() == 4); assert(larger_r.begin()->first == string("aaaa")); return 0; }