/usr/include/luabind/detail/inheritance.hpp is in libluabind-dev 0.9.1+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// 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_INHERITANCE_090217_HPP
# define LUABIND_INHERITANCE_090217_HPP
# include <cassert>
# include <limits>
# include <map>
# include <memory>
# include <vector>
# include <luabind/typeid.hpp>
# include <boost/scoped_ptr.hpp>
namespace luabind { namespace detail {
typedef void*(*cast_function)(void*);
typedef std::size_t class_id;
class_id const unknown_class = (std::numeric_limits<class_id>::max)();
class class_rep;
class LUABIND_API cast_graph
{
public:
cast_graph();
~cast_graph();
// `src` and `p` here describe the *most derived* object. This means that
// for a polymorphic type, the pointer must be cast with
// dynamic_cast<void*> before being passed in here, and `src` has to
// match typeid(*p).
std::pair<void*, int> cast(
void* p, class_id src, class_id target
, class_id dynamic_id, void const* dynamic_ptr) const;
void insert(class_id src, class_id target, cast_function cast);
private:
class impl;
boost::scoped_ptr<impl> m_impl;
};
// Maps a type_id to a class_id. Note that this actually partitions the
// id-space into two, using one half for "local" ids; ids that are used only as
// keys into the conversion cache. This is needed because we need a unique key
// even for types that hasn't been registered explicitly.
class LUABIND_API class_id_map
{
public:
class_id_map();
class_id get(type_id const& type) const;
class_id get_local(type_id const& type);
void put(class_id id, type_id const& type);
private:
typedef std::map<type_id, class_id> map_type;
map_type m_classes;
class_id m_local_id;
static class_id const local_id_base;
};
inline class_id_map::class_id_map()
: m_local_id(local_id_base)
{}
inline class_id class_id_map::get(type_id const& type) const
{
map_type::const_iterator i = m_classes.find(type);
if (i == m_classes.end() || i->second >= local_id_base)
return unknown_class;
return i->second;
}
inline class_id class_id_map::get_local(type_id const& type)
{
std::pair<map_type::iterator, bool> result = m_classes.insert(
std::make_pair(type, 0));
if (result.second)
result.first->second = m_local_id++;
assert(m_local_id >= local_id_base);
return result.first->second;
}
inline void class_id_map::put(class_id id, type_id const& type)
{
assert(id < local_id_base);
std::pair<map_type::iterator, bool> result = m_classes.insert(
std::make_pair(type, 0));
assert(
result.second
|| result.first->second == id
|| result.first->second >= local_id_base
);
result.first->second = id;
}
class class_map
{
public:
class_rep* get(class_id id) const;
void put(class_id id, class_rep* cls);
private:
std::vector<class_rep*> m_classes;
};
inline class_rep* class_map::get(class_id id) const
{
if (id >= m_classes.size())
return 0;
return m_classes[id];
}
inline void class_map::put(class_id id, class_rep* cls)
{
if (id >= m_classes.size())
m_classes.resize(id + 1);
m_classes[id] = cls;
}
template <class S, class T>
struct static_cast_
{
static void* execute(void* p)
{
return static_cast<T*>(static_cast<S*>(p));
}
};
template <class S, class T>
struct dynamic_cast_
{
static void* execute(void* p)
{
return dynamic_cast<T*>(static_cast<S*>(p));
}
};
// Thread safe class_id allocation.
LUABIND_API class_id allocate_class_id(type_id const& cls);
template <class T>
struct registered_class
{
static class_id const id;
};
template <class T>
class_id const registered_class<T>::id = allocate_class_id(typeid(T));
template <class T>
struct registered_class<T const>
: registered_class<T>
{};
}} // namespace luabind::detail
#endif // LUABIND_INHERITANCE_090217_HPP
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