V-Gears/lib/luabind/luabind/shared_ptr_converter.hpp

// Copyright Daniel Wallin 2009. 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)

#ifndef LUABIND_SHARED_PTR_CONVERTER_090211_HPP
# define LUABIND_SHARED_PTR_CONVERTER_090211_HPP

# include <luabind/get_main_thread.hpp>
# include <luabind/handle.hpp>
# include <luabind/detail/policy.hpp>
# include <boost/shared_ptr.hpp>

namespace luabind {

namespace detail
{

  struct shared_ptr_deleter
  {
      shared_ptr_deleter(lua_State* L, int index)
        : life_support(get_main_thread(L), L, index)
      {}

      void operator()(void const*)
      {
          handle().swap(life_support);
      }

      handle life_support;
  };

} // namespace detail

template <class T>
struct default_converter<boost::shared_ptr<T> >
  : default_converter<T*>
{
    typedef boost::mpl::false_ is_native;

    template <class U>
    int match(lua_State* L, U, int index)
    {
        return default_converter<T*>::match(
            L, LUABIND_DECORATE_TYPE(T*), index);
    }

    template <class U>
    boost::shared_ptr<T> apply(lua_State* L, U, int index)
    {
        T* raw_ptr = default_converter<T*>::apply(
            L, LUABIND_DECORATE_TYPE(T*), index);
        if (!raw_ptr)
            return boost::shared_ptr<T>();
        return boost::shared_ptr<T>(
            raw_ptr, detail::shared_ptr_deleter(L, index));
    }

    void apply(lua_State* L, boost::shared_ptr<T> const& p)
    {
        if (detail::shared_ptr_deleter* d =
                boost::get_deleter<detail::shared_ptr_deleter>(p))
        {
            d->life_support.push(L);
        }
        else
        {
            detail::value_converter().apply(L, p);
        }
    }

    template <class U>
    void converter_postcall(lua_State*, U const&, int)
    {}
};

template <class T>
struct default_converter<boost::shared_ptr<T> const&>
  : default_converter<boost::shared_ptr<T> >
{};

} // namespace luabind

#endif // LUABIND_SHARED_PTR_CONVERTER_090211_HPP