Chris@102: #ifndef BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP
Chris@102: #define BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP
Chris@102: 
Chris@102: // MS compatible compilers support #pragma once
Chris@102: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@102: # pragma once
Chris@102: #endif
Chris@102: 
Chris@102: /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
Chris@102: // helper_collection.hpp: archive support for run-time helpers
Chris@102: 
Chris@102: // (C) Copyright 2002-2008 Robert Ramey and Joaquin M Lopez Munoz
Chris@102: // Use, modification and distribution is subject to the Boost Software
Chris@102: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: 
Chris@102: //  See http://www.boost.org for updates, documentation, and revision history.
Chris@102: 
Chris@102: #include <cstddef> // NULL
Chris@102: #include <vector>
Chris@102: #include <utility>
Chris@102: #include <memory>
Chris@102: #include <algorithm>
Chris@102: 
Chris@102: #include <boost/config.hpp>
Chris@102: 
Chris@102: #include <boost/smart_ptr/shared_ptr.hpp>
Chris@102: #include <boost/smart_ptr/make_shared.hpp>
Chris@102: 
Chris@102: namespace boost {
Chris@102: 
Chris@102: namespace archive {
Chris@102: namespace detail {
Chris@102: 
Chris@102: class helper_collection
Chris@102: {
Chris@102:     helper_collection(const helper_collection&);              // non-copyable
Chris@102:     helper_collection& operator = (const helper_collection&); // non-copyable
Chris@102: 
Chris@102:     // note: we dont' actually "share" the function object pointer
Chris@102:     // we only use shared_ptr to make sure that it get's deleted
Chris@102: 
Chris@102:     typedef std::pair<
Chris@102:         const void *,
Chris@102:         boost::shared_ptr<void>
Chris@102:     > helper_value_type;
Chris@102:     template<class T>
Chris@102:     boost::shared_ptr<void> make_helper_ptr(){
Chris@102:         // use boost::shared_ptr rather than std::shared_ptr to maintain
Chris@102:         // c++03 compatibility
Chris@102:         return boost::make_shared<T>();
Chris@102:     }
Chris@102: 
Chris@102:     typedef std::vector<helper_value_type> collection;
Chris@102:     collection m_collection;
Chris@102: 
Chris@102:     struct predicate {
Chris@102:         const void * const m_ti;
Chris@102:         bool operator()(helper_value_type const &rhs) const {
Chris@102:             return m_ti == rhs.first;
Chris@102:         }
Chris@102:         predicate & operator=(const void * ti); // to suppress warning
Chris@102:         predicate(const void * ti) :
Chris@102:             m_ti(ti)
Chris@102:         {}
Chris@102:     };
Chris@102: protected:
Chris@102:     helper_collection(){}
Chris@102:     ~helper_collection(){}
Chris@102: public:
Chris@102:     template<typename Helper>
Chris@102:     Helper& get_helper(void * const id = 0) {
Chris@102:         collection::const_iterator it =
Chris@102:             std::find_if(
Chris@102:                 m_collection.begin(),
Chris@102:                 m_collection.end(),
Chris@102:                 predicate(id)
Chris@102:             );
Chris@102: 
Chris@102:         void * rval = 0;
Chris@102:         if(it == m_collection.end()){
Chris@102:             m_collection.push_back(
Chris@102:                 std::make_pair(id, make_helper_ptr<Helper>())
Chris@102:             );
Chris@102:             rval = m_collection.back().second.get();
Chris@102:         }
Chris@102:         else{
Chris@102:             rval = it->second.get();
Chris@102:         }
Chris@102:         return *static_cast<Helper *>(rval);
Chris@102:     }
Chris@102: };
Chris@102: 
Chris@102: } // namespace detail
Chris@102: } // namespace serialization
Chris@102: } // namespace boost
Chris@102: 
Chris@102: #endif // BOOST_ARCHIVE_DETAIL_HELPER_COLLECTION_HPP