1 // Copyright David Abrahams, Daniel Wallin 2003.
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE_1_0.txt or copy at
4 // http://www.boost.org/LICENSE_1_0.txt)
6 #ifndef BOOST_PARAMETER_AUX_PACK_MAKE_ITEMS_HPP
7 #define BOOST_PARAMETER_AUX_PACK_MAKE_ITEMS_HPP
9 #include <boost/parameter/aux_/void.hpp>
10 #include <boost/parameter/aux_/pack/item.hpp>
11 #include <boost/parameter/config.hpp>
13 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
14 #include <boost/mp11/utility.hpp>
15 #include <type_traits>
17 #include <boost/mpl/eval_if.hpp>
18 #include <boost/mpl/identity.hpp>
19 #include <boost/type_traits/is_same.hpp>
22 namespace boost { namespace parameter { namespace aux {
24 // Creates a item typelist.
25 template <typename Spec, typename Arg, typename Tail>
26 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
27 using make_items = ::boost::mp11::mp_if<
28 ::std::is_same<Arg,::boost::parameter::void_>
29 , ::boost::mp11::mp_identity< ::boost::parameter::void_>
30 , ::boost::parameter::aux::make_item<Spec,Arg,Tail>
34 : ::boost::mpl::eval_if<
35 ::boost::is_same<Arg,::boost::parameter::void_>
36 , ::boost::mpl::identity< ::boost::parameter::void_>
37 , ::boost::parameter::aux::make_item<Spec,Arg,Tail>
42 }}} // namespace boost::parameter::aux
44 #endif // include guard