comparison DEPENDENCIES/generic/include/boost/archive/detail/helper_collection.hpp @ 102:f46d142149f5

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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>
+
+#include <boost/smart_ptr/shared_ptr.hpp>
+#include <boost/smart_ptr/make_shared.hpp>
+
+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
+
+    typedef std::pair<
+        const void *,
+        boost::shared_ptr<void>
+    > helper_value_type;
+    template<class T>
+    boost::shared_ptr<void> make_helper_ptr(){
+        // use boost::shared_ptr rather than std::shared_ptr to maintain
+        // c++03 compatibility
+        return boost::make_shared<T>();
+    }
+
+    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 & operator=(const void * ti); // to suppress warning
+        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 = 0;
+        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