Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 79 insertions, 0 deletions

diff --git a/libs/intrusive/example/doc_treap_algorithms.cpp b/libs/intrusive/example/doc_treap_algorithms.cpp
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+++ b/libs/intrusive/example/doc_treap_algorithms.cpp
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+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2007-2009
+//
+// 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)
+//
+// See http://www.boost.org/libs/intrusive for documentation.
+//
+/////////////////////////////////////////////////////////////////////////////
+//[doc_treap_algorithms_code
+#include <boost/intrusive/treap_algorithms.hpp>
+#include <cassert>
+
+struct my_node
+{
+   my_node(int i = 0, unsigned int priority = 0)
+      :  prio_(priority), int_(i)
+   {}
+   my_node *parent_, *left_, *right_;
+   int prio_;
+   //other members
+   int      int_;
+};
+
+//Define our own treap_node_traits
+struct my_treap_node_traits
+{
+   typedef my_node                                    node;
+   typedef my_node *                                  node_ptr;
+   typedef const my_node *                            const_node_ptr;
+
+   static node_ptr get_parent(const_node_ptr n)       {  return n->parent_;   }  
+   static void set_parent(node_ptr n, node_ptr parent){  n->parent_ = parent; }  
+   static node_ptr get_left(const_node_ptr n)         {  return n->left_;     }  
+   static void set_left(node_ptr n, node_ptr left)    {  n->left_ = left;     }  
+   static node_ptr get_right(const_node_ptr n)        {  return n->right_;    }  
+   static void set_right(node_ptr n, node_ptr right)  {  n->right_ = right;   }  
+};
+
+struct node_ptr_compare
+{  bool operator()(const my_node *a, const my_node *b) {  return a->int_ < b->int_;  }  };
+
+struct node_ptr_priority
+{  bool operator()(const my_node *a, const my_node *b) {  return a->prio_ < b->prio_;}  };
+
+int main()
+{
+   typedef boost::intrusive::treap_algorithms<my_treap_node_traits> algo;
+   my_node header, two(2, 5), three(3, 1);
+
+   //Create an empty treap container:
+   //"header" will be the header node of the tree
+   algo::init_header(&header);
+
+   //Now insert node "two" in the tree using the sorting functor
+   algo::insert_equal_upper_bound(&header, &two, node_ptr_compare(), node_ptr_priority());
+
+   //Now insert node "three" in the tree using the sorting functor
+   algo::insert_equal_lower_bound(&header, &three, node_ptr_compare(), node_ptr_priority());
+
+   //Now take the first node (the left node of the header)
+   my_node *n = header.left_;
+   assert(n == &two);
+
+   //Now go to the next node
+   n = algo::next_node(n);
+   assert(n == &three);      
+
+   //Erase a node just using a pointer to it
+   algo::unlink(&two, node_ptr_priority());
+
+   //Erase a node using also the header (faster)
+   algo::erase(&header, &three, node_ptr_priority());
+   return 0;
+}
+
+//]