author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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permissions | -rw-r--r-- |
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// Copyright 2004 The Trustees of Indiana University. |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// Authors: Douglas Gregor |
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// Andrew Lumsdaine |
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#ifndef BOOST_GRAPH_SMALL_WORLD_GENERATOR_HPP |
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#define BOOST_GRAPH_SMALL_WORLD_GENERATOR_HPP |
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#include <iterator> |
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#include <utility> |
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#include <boost/random/uniform_01.hpp> |
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#include <boost/random/uniform_int.hpp> |
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namespace boost { |
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// Assumes undirected |
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template<typename RandomGenerator, typename Graph> |
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class small_world_iterator |
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{ |
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typedef typename graph_traits<Graph>::vertices_size_type |
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vertices_size_type; |
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public: |
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typedef std::input_iterator_tag iterator_category; |
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typedef std::pair<vertices_size_type, vertices_size_type> value_type; |
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typedef const value_type& reference; |
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typedef const value_type* pointer; |
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typedef void difference_type; |
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small_world_iterator() : gen(0) {} |
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small_world_iterator(RandomGenerator& gen, vertices_size_type n, |
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vertices_size_type k, double prob = 0.0, |
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bool allow_self_loops = false) |
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: gen(&gen), n(n), k(k), prob(prob), source(0), |
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target(allow_self_loops? 0 : 1), |
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allow_self_loops(allow_self_loops), |
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current(0, allow_self_loops? 0 : 1) |
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{ } |
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reference operator*() const { return current; } |
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pointer operator->() const { return ¤t; } |
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small_world_iterator& operator++() |
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{ |
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target = (target + 1) % n; |
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if (target == (source + k/2 + 1) % n) { |
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++source; |
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if (allow_self_loops) target = source; |
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else target = (source + 1) % n; |
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} |
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current.first = source; |
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uniform_01<RandomGenerator, double> rand01(*gen); |
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uniform_int<vertices_size_type> rand_vertex_gen(0, n-1); |
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double x = rand01(); |
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*gen = rand01.base(); // GRRRR |
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if (x < prob) { |
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vertices_size_type lower = (source + n - k/2) % n; |
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vertices_size_type upper = (source + k/2) % n; |
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do { |
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current.second = rand_vertex_gen(*gen); |
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} while (current.second >= lower && current.second <= upper |
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|| (upper < lower |
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&& (current.second >= lower || current.second <= upper))); |
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} else { |
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current.second = target; |
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} |
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return *this; |
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} |
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small_world_iterator operator++(int) |
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{ |
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small_world_iterator temp(*this); |
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++(*this); |
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return temp; |
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} |
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bool operator==(const small_world_iterator& other) const |
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{ |
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if (!gen && other.gen) return other == *this; |
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else if (gen && !other.gen) return source == n; |
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else if (!gen && !other.gen) return true; |
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return source == other.source && target == other.target; |
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} |
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bool operator!=(const small_world_iterator& other) const |
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{ return !(*this == other); } |
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private: |
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void next() |
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{ |
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uniform_int<vertices_size_type> rand_vertex(0, n-1); |
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current.first = rand_vertex(*gen); |
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do { |
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current.second = rand_vertex(*gen); |
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} while (current.first == current.second && !allow_self_loops); |
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} |
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RandomGenerator* gen; |
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vertices_size_type n; |
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vertices_size_type k; |
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105 |
double prob; |
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106 |
vertices_size_type source; |
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107 |
vertices_size_type target; |
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108 |
bool allow_self_loops; |
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value_type current; |
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110 |
}; |
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111 |
|
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} // end namespace boost |
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113 |
|
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#endif // BOOST_GRAPH_SMALL_WORLD_GENERATOR_HPP |