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[SVN r38076]

example/doc_erasing_and_disposing.cpp

@@ -0,0 +1,73 @@
+/////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga  2006-2007
+//
+// 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_erasing_and_disposing
+#include <boost/intrusive/list.hpp>
+
+//A class that can be inserted in an intrusive list
+class my_class 
+   :  public boost::intrusive::list_base_hook<>
+{
+   public:
+   my_class(int i)
+      :  int_(i)
+   {}
+
+   int int_;
+   //...
+};
+
+//Definition of the intrusive list
+typedef boost::intrusive::list< my_class::value_traits<my_class> > my_class_list;
+
+//The predicate function
+class is_even
+{
+   public:
+   bool operator()(const my_class &c) const
+   {  return 0 == (c.int_ % 2);  }
+};
+
+//The disposer object function
+class delete_disposer
+{
+   public:
+   void operator()(my_class *delete_this)
+   {  delete delete_this;  }
+};
+
+int main()
+{
+   const int MaxElem = 100;
+
+   //Fill all the nodes and insert them in the list
+   my_class_list list;
+
+   try{
+      //Insert new objects in the container
+      for(int i = 0; i < MaxElem; ++i){
+         list.push_back(*new my_class(i));
+      }
+
+      //Now use remove_and_dispose_if to erase and delete the objects
+      list.remove_and_dispose_if(is_even(), delete_disposer());
+   }
+   catch(...){
+      //If something throws, make sure that all the memory is freed
+      list.clear_and_dispose(delete_disposer());
+      throw;
+   }
+
+   //Dispose remaining elements
+   list.erase_and_dispose(list.begin(), list.end(), delete_disposer());
+   return 0;
+}
+//]