comparison DEPENDENCIES/generic/include/boost/pending/mutable_heap.hpp @ 16:2665513ce2d3

Add boost headers

+//
+//=======================================================================
+// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
+// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//=======================================================================
+//
+#ifndef BOOST_GRAPH_DETAIL_MUTABLE_HEAP_H
+#define BOOST_GRAPH_DETAIL_MUTABLE_HEAP_H
+
+/*
+  There are a few things wrong with this set of functions.
+
+  ExternalData should be removed, it is not part of the core
+  algorithm. It can be handled inside the tree nodes.
+
+  The swap() should be replaced by assignment since its use is causing
+  the number of memory references to double.
+
+  The min_element should be replaced by a fixed length loop
+  (fixed at d for d-heaps).
+
+  The member functions of TreeNode should be changed to global
+  functions.
+
+  These functions will be replaced by those in heap_tree.h
+
+ */
+
+namespace boost {
+
+  template <class TreeNode, class Compare, class ExternalData>
+  inline TreeNode up_heap(TreeNode x, const Compare& comp, ExternalData& edata) {
+    while (x.has_parent() && comp(x, x.parent()))
+      x.swap(x.parent(), edata);
+    return x;
+  }
+
+  template <class TreeNode, class Compare, class ExternalData>
+  inline TreeNode down_heap(TreeNode x, const Compare& comp, ExternalData& edata) {
+    while (x.children().size() > 0) {
+      typename TreeNode::children_type::iterator 
+        child_iter = std::min_element(x.children().begin(),
+                                      x.children().end(), 
+                                      comp);
+      if (comp(*child_iter, x))
+        x.swap(*child_iter, edata);
+      else
+        break;
+    }
+    return x;
+  }
+
+  template <class TreeNode, class Compare, class ExternalData>
+  inline void update_heap(TreeNode x, const Compare& comp, ExternalData& edata) {
+    x = down_heap(x, comp, edata);
+    (void)up_heap(x, comp, edata);
+  }
+
+}
+#endif