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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 <typeinfo>
#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 std::type_info *,
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 std::type_info *,
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 std::type_info * m_ti;
bool operator()(helper_value_type const &rhs) const {
return *m_ti == *rhs.first;
}
predicate(const std::type_info * ti) :
m_ti(ti)
{}
};
protected:
helper_collection(){}
~helper_collection(){}
public:
template<typename Helper>
Helper& get_helper(Helper * = NULL) {
const std::type_info * eti = & typeid(Helper);
collection::const_iterator it =
std::find_if(
m_collection.begin(),
m_collection.end(),
predicate(eti)
);
void * rval;
if(it == m_collection.end()){
m_collection.push_back(
std::make_pair(eti, 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
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