V-Gears/lib/luabind/luabind/detail/class_rep.hpp

// Copyright (c) 2003 Daniel Wallin and Arvid Norberg

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.


#ifndef LUABIND_CLASS_REP_HPP_INCLUDED
#define LUABIND_CLASS_REP_HPP_INCLUDED

#include <boost/limits.hpp>

#include <string>
#include <utility>
#include <vector>

#include <luabind/config.hpp>
#include <luabind/lua_include.hpp>
#include <luabind/detail/garbage_collector.hpp>
#include <luabind/detail/operator_id.hpp>
#include <luabind/detail/class_registry.hpp>
#include <luabind/error.hpp>
#include <luabind/handle.hpp>
#include <luabind/detail/primitives.hpp>
#include <luabind/typeid.hpp>
#include <luabind/detail/ref.hpp>

namespace luabind { namespace detail
{

	LUABIND_API std::string stack_content_by_name(lua_State* L, int start_index);

	struct class_registration;

	struct conversion_storage;

	// This function is used as a tag to identify "properties".
	LUABIND_API int property_tag(lua_State*);

	// this is class-specific information, poor man's vtable
	// this is allocated statically (removed by the compiler)
	// a pointer to this structure is stored in the lua tables'
	// metatable with the name __classrep
	// it is used when matching parameters to function calls
	// to determine possible implicit casts
	// it is also used when finding the best match for overloaded
	// methods

    class cast_graph;
    class class_id_map;

	class LUABIND_API class_rep
	{
	friend struct class_registration;
	friend int super_callback(lua_State*);
//TODO: avoid the lua-prefix
	friend int lua_class_gettable(lua_State*);
	friend int lua_class_settable(lua_State*);
	friend int static_class_gettable(lua_State*);
	public:

		enum class_type
		{
			cpp_class = 0,
			lua_class = 1
		};

		// EXPECTS THE TOP VALUE ON THE LUA STACK TO
		// BE THE USER DATA WHERE THIS CLASS IS BEING
		// INSTANTIATED!
		class_rep(type_id const& type
			, const char* name
			, lua_State* L
        );

		// used when creating a lua class
		// EXPECTS THE TOP VALUE ON THE LUA STACK TO
		// BE THE USER DATA WHERE THIS CLASS IS BEING
		// INSTANTIATED!
		class_rep(lua_State* L, const char* name);

		~class_rep();

		std::pair<void*,void*> allocate(lua_State* L) const;

		// this is called as metamethod __call on the class_rep.
		static int constructor_dispatcher(lua_State* L);

		struct base_info
		{
			int pointer_offset; // the offset added to the pointer to obtain a basepointer (due to multiple-inheritance)
			class_rep* base;
		};

		void add_base_class(const base_info& binfo);

		const std::vector<base_info>& bases() const throw() { return m_bases; }

		void set_type(type_id const& t) { m_type = t; }
		type_id const& type() const throw() { return m_type; }

		const char* name() const throw() { return name_; }

		// the lua reference to the metatable for this class' instances
		int metatable_ref() const throw() { return m_instance_metatable; }

		void get_table(lua_State* L) const { m_table.push(L); }
		void get_default_table(lua_State* L) const { m_default_table.push(L); }

		class_type get_class_type() const { return m_class_type; }

		void add_static_constant(const char* name, int val);

		static int super_callback(lua_State* L);

		static int lua_settable_dispatcher(lua_State* L);

		// called from the metamethod for __index
		// obj is the object pointer
		static int static_class_gettable(lua_State* L);

		bool has_operator_in_lua(lua_State*, int id);

        cast_graph const& casts() const
        {
            return *m_casts;
        }

        class_id_map const& classes() const
        {
            return *m_classes;
        }

	private:

		void cache_operators(lua_State*);

		// this is a pointer to the type_info structure for
		// this type
		// warning: this may be a problem when using dll:s, since
		// typeid() may actually return different pointers for the same
		// type.
		type_id m_type;

		// a list of info for every class this class derives from
		// the information stored here is sufficient to do
		// type casts to the base classes
		std::vector<base_info> m_bases;

		// the class' name (as given when registered to lua with class_)
		const char* name_;

		// a reference to this structure itself. Since this struct
		// is kept inside lua (to let lua collect it when lua_close()
		// is called) we need to lock it to prevent collection.
		// the actual reference is not currently used.
		detail::lua_reference m_self_ref;

		// this should always be used when accessing
		// members in instances of a class.
		// this table contains c closures for all
		// member functions in this class, they
		// may point to both static and virtual functions
		handle m_table;

		// this table contains default implementations of the
		// virtual functions in m_table.
		handle m_default_table;

		// the type of this class.. determines if it's written in c++ or lua
		class_type m_class_type;

		// this is a lua reference that points to the lua table
		// that is to be used as meta table for all instances
		// of this class.
		int m_instance_metatable;

		std::map<const char*, int, ltstr> m_static_constants;

		// the first time an operator is invoked
		// we check the associated lua table
		// and cache the result
		int m_operator_cache;

        cast_graph* m_casts;
        class_id_map* m_classes;
	};

	bool is_class_rep(lua_State* L, int index);

}}

//#include <luabind/detail/overload_rep_impl.hpp>

#endif // LUABIND_CLASS_REP_HPP_INCLUDED