Add SCons configure checks

[senf.git] / boost_ext / boost / multi_index / detail / header_holder.hpp

diff --git a/boost_ext/boost/multi_index/detail/header_holder.hpp b/boost_ext/boost/multi_index/detail/header_holder.hpp
new file mode 100644 (file)
index 0000000..8bd1e5d
--- /dev/null
+++ b/boost_ext/boost/multi_index/detail/header_holder.hpp
@@ -0,0 +1,50 @@
+/* Copyright 2003-2007 Joaquín M López Muñoz.
+ * 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/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_DETAIL_HEADER_HOLDER_HPP
+#define BOOST_MULTI_INDEX_DETAIL_HEADER_HOLDER_HPP
+
+#if defined(_MSC_VER)&&(_MSC_VER>=1200)
+#pragma once
+#endif
+
+#include <boost/noncopyable.hpp>
+
+namespace boost{
+
+namespace multi_index{
+
+namespace detail{
+
+/* A utility class used to hold a pointer to the header node.
+ * The base from member idiom is used because index classes, which are
+ * superclasses of multi_index_container, need this header in construction
+ * time. The allocation is made by the allocator of the multi_index_container
+ * class --hence, this allocator needs also be stored resorting
+ * to the base from member trick.
+ */
+
+template<typename NodeTypePtr,typename Final>
+struct header_holder:private noncopyable
+{
+  header_holder():member(final().allocate_node()){}
+  ~header_holder(){final().deallocate_node(&*member);}
+
+  NodeTypePtr member;
+
+private:
+  Final& final(){return *static_cast<Final*>(this);}
+};
+
+} /* namespace multi_index::detail */
+
+} /* namespace multi_index */
+
+} /* namespace boost */
+
+#endif