author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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// |
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//======================================================================= |
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// Copyright 1997, 1998, 1999, 2000 University of Notre Dame. |
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// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// 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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//======================================================================= |
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// |
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#ifndef BOOST_GRAPH_DETAIL_MUTABLE_HEAP_H |
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#define BOOST_GRAPH_DETAIL_MUTABLE_HEAP_H |
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/* |
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There are a few things wrong with this set of functions. |
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ExternalData should be removed, it is not part of the core |
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algorithm. It can be handled inside the tree nodes. |
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The swap() should be replaced by assignment since its use is causing |
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the number of memory references to double. |
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The min_element should be replaced by a fixed length loop |
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(fixed at d for d-heaps). |
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The member functions of TreeNode should be changed to global |
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functions. |
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These functions will be replaced by those in heap_tree.h |
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*/ |
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namespace boost { |
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template <class TreeNode, class Compare, class ExternalData> |
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inline TreeNode up_heap(TreeNode x, const Compare& comp, ExternalData& edata) { |
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while (x.has_parent() && comp(x, x.parent())) |
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x.swap(x.parent(), edata); |
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return x; |
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} |
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template <class TreeNode, class Compare, class ExternalData> |
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inline TreeNode down_heap(TreeNode x, const Compare& comp, ExternalData& edata) { |
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while (x.children().size() > 0) { |
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typename TreeNode::children_type::iterator |
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child_iter = std::min_element(x.children().begin(), |
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x.children().end(), |
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comp); |
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if (comp(*child_iter, x)) |
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x.swap(*child_iter, edata); |
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else |
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break; |
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} |
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return x; |
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} |
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template <class TreeNode, class Compare, class ExternalData> |
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inline void update_heap(TreeNode x, const Compare& comp, ExternalData& edata) { |
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x = down_heap(x, comp, edata); |
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(void)up_heap(x, comp, edata); |
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} |
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} |
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#endif |