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+#ifndef BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP
+#define BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// helper_collection.hpp: archive support for run-time helpers
+
+// (C) Copyright 2002-2008 Robert Ramey and Joaquin M Lopez Munoz
+// Use, modification and distribution is subject to 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 for updates, documentation, and revision history.
+
+#include <cstddef> // NULL
+#include <vector>
+#include <utility>
+#include <memory>
+#include <algorithm>
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_NO_CXX11_SMART_PTR
+ #include <boost/smart_ptr/shared_ptr.hpp>
+ #include <boost/smart_ptr/make_shared.hpp>
+#endif
+
+namespace boost {
+
+namespace archive {
+namespace detail {
+
+class helper_collection
+{
+ helper_collection(const helper_collection&); // non-copyable
+ helper_collection& operator = (const helper_collection&); // non-copyable
+
+ // note: we dont' actually "share" the function object pointer
+ // we only use shared_ptr to make sure that it get's deleted
+
+ #ifndef BOOST_NO_CXX11_SMART_PTR
+ typedef std::pair<
+ const void *,
+ std::shared_ptr<void>
+ > helper_value_type;
+ template<class T>
+ std::shared_ptr<void> make_helper_ptr(){
+ return std::make_shared<T>();
+ }
+ #else
+ typedef std::pair<
+ const void *,
+ boost::shared_ptr<void>
+ > helper_value_type;
+ template<class T>
+ boost::shared_ptr<void> make_helper_ptr(){
+ return boost::make_shared<T>();
+ }
+ #endif
+ typedef std::vector<helper_value_type> collection;
+ collection m_collection;
+
+ struct predicate {
+ const void * const m_ti;
+ bool operator()(helper_value_type const &rhs) const {
+ return m_ti == rhs.first;
+ }
+ predicate(const void * ti) :
+ m_ti(ti)
+ {}
+ };
+protected:
+ helper_collection(){}
+ ~helper_collection(){}
+public:
+ template<typename Helper>
+ Helper& get_helper(void * const id = 0) {
+
+ collection::const_iterator it =
+ std::find_if(
+ m_collection.begin(),
+ m_collection.end(),
+ predicate(id)
+ );
+
+ void * rval;
+ if(it == m_collection.end()){
+ m_collection.push_back(
+ std::make_pair(id, make_helper_ptr<Helper>())
+ );
+ rval = m_collection.back().second.get();
+ }
+ else{
+ rval = it->second.get();
+ }
+ return *static_cast<Helper *>(rval);
+ }
+};
+
+} // namespace detail
+} // namespace serialization
+} // namespace boost
+
+#endif // BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP