call_function.hpp

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			{
			friend class luabind::object;
			public:

				typedef int(*function_t)(lua_State*, int, int);

				proxy_function_void_caller(
					lua_State* L
					, int params
					, function_t fun
					, const Tuple args)
					: m_state(L)
					, m_params(params)
					, m_fun(fun)
					, m_args(args)
					, m_called(false)
				{
				}

				proxy_function_void_caller(const proxy_function_void_caller& rhs)
					: m_state(rhs.m_state)
					, m_params(rhs.m_params)
					, m_fun(rhs.m_fun)
					, m_args(rhs.m_args)
					, m_called(rhs.m_called)
				{
					rhs.m_called = true;
				}

				~proxy_function_void_caller()
				{
					if (m_called) return;

					m_called = true;
					lua_State* L = m_state;

					int top = lua_gettop(L);

					push_args_from_tuple<1>::apply(L, m_args);
					if (m_fun(L, boost::tuples::length<Tuple>::value, 0))
					{
						assert(lua_gettop(L) == top - m_params + 1);
#ifndef LUABIND_NO_EXCEPTIONS
						throw luabind::error(L);
#else
						error_callback_fun e = get_error_callback();
						if (e) e(L);
	
						assert(0 && "the lua function threw an error and exceptions are disabled."
								" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();
#endif
					}
					// pops the return values from the function call
					stack_pop pop(L, lua_gettop(L) - top + m_params);
				}

				template<class Policies>
				void operator[](const Policies& p)
				{
					m_called = true;
					lua_State* L = m_state;

					int top = lua_gettop(L);

					detail::push_args_from_tuple<1>::apply(L, m_args, p);
					if (m_fun(L, boost::tuples::length<Tuple>::value, 0))
					{
						assert(lua_gettop(L) == top - m_params + 1);
#ifndef LUABIND_NO_EXCEPTIONS
						throw error(L);
#else
						error_callback_fun e = get_error_callback();
						if (e) e(L);
	
						assert(0 && "the lua function threw an error and exceptions are disabled."
							" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();
#endif
					}
					// pops the return values from the function call
					stack_pop pop(L, lua_gettop(L) - top + m_params);
				}

			private:

				lua_State* m_state;
				int m_params;
				function_t m_fun;
				Tuple m_args;
				mutable bool m_called;

			};

	}

	#define BOOST_PP_ITERATION_PARAMS_1 (4, (0, LUABIND_MAX_ARITY, <luabind/detail/call_function.hpp>, 1))
	#include BOOST_PP_ITERATE()

}

#endif // LUABIND_CALL_FUNCTION_HPP_INCLUDED

#elif BOOST_PP_ITERATION_FLAGS() == 1

#define LUABIND_TUPLE_PARAMS(z, n, data) const A##n *
#define LUABIND_OPERATOR_PARAMS(z, n, data) const A##n & a##n


	template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
	typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
	call_function(lua_State* L, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
	{
		assert(name && "luabind::call_function() expects a function name");
		typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
#if BOOST_PP_ITERATION() == 0
		tuple_t args;
#else
		tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
#endif
		typedef typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;

		lua_pushstring(L, name);
		lua_gettable(L, LUA_GLOBALSINDEX);

		return proxy_type(L, 1, &detail::pcall, args);
	}

	template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
	typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
	call_function(luabind::object const& obj BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
	{
		typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
#if BOOST_PP_ITERATION() == 0
		tuple_t args;
#else
		tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
#endif
		typedef typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;

		obj.push(obj.interpreter());
		return proxy_type(obj.interpreter(), 1, &detail::pcall, args);
	}

	template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
	typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
	resume_function(lua_State* L, const char* name BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
	{
		assert(name && "luabind::resume_function() expects a function name");
		typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
#if BOOST_PP_ITERATION() == 0
		tuple_t args;
#else
		tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
#endif
		typedef typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;

		lua_pushstring(L, name);
		lua_gettable(L, LUA_GLOBALSINDEX);

		return proxy_type(L, 1, &detail::resume_impl, args);
	}

	template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
	typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
	resume_function(luabind::object const& obj BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
	{
		typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
#if BOOST_PP_ITERATION() == 0
		tuple_t args;
#else
		tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
#endif
		typedef typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;

		obj.push(obj.interpreter());
		return proxy_type(obj.interpreter(), 1, &detail::resume_impl, args);
	}

	template<class Ret BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), class A)>
	typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type
	resume(lua_State* L BOOST_PP_COMMA_IF(BOOST_PP_ITERATION()) BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_OPERATOR_PARAMS, _) )
	{
		typedef boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> tuple_t;
#if BOOST_PP_ITERATION() == 0
		tuple_t args;
#else
		tuple_t args(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), &a));
#endif
		typedef typename boost::mpl::if_<boost::is_void<Ret>
			, luabind::detail::proxy_function_void_caller<boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> >
			, luabind::detail::proxy_function_caller<Ret, boost::tuples::tuple<BOOST_PP_ENUM(BOOST_PP_ITERATION(), LUABIND_TUPLE_PARAMS, _)> > >::type proxy_type;

		return proxy_type(L, 0, &detail::resume_impl, args);
	}


#undef LUABIND_OPERATOR_PARAMS
#undef LUABIND_TUPLE_PARAMS


#endif