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)
5
6#ifndef BOOST_PARAMETER_AUX_PACK_MAKE_DEDUCED_ITEMS_HPP
7#define BOOST_PARAMETER_AUX_PACK_MAKE_DEDUCED_ITEMS_HPP
8
9#include <boost/parameter/aux_/void.hpp>
10#include <boost/parameter/aux_/pack/deduced_item.hpp>
11#include <boost/parameter/deduced.hpp>
12#include <boost/parameter/config.hpp>
13
14#if defined(BOOST_PARAMETER_CAN_USE_MP11)
15#include <boost/mp11/utility.hpp>
16#include <type_traits>
17#else
18#include <boost/mpl/eval_if.hpp>
19#include <boost/mpl/identity.hpp>
20#include <boost/type_traits/is_same.hpp>
21#endif
22
23namespace boost { namespace parameter { namespace aux {
24
25 template <typename Spec, typename Tail>
26#if defined(BOOST_PARAMETER_CAN_USE_MP11)
27 using make_deduced_items = ::boost::mp11::mp_if<
28 ::std::is_same<Spec,::boost::parameter::void_>
29 , ::boost::mp11::mp_identity< ::boost::parameter::void_>
30 , ::boost::mp11::mp_if<
31 ::boost::parameter::aux::is_deduced<Spec>
32 , ::boost::parameter::aux::make_deduced_item<Spec,Tail>
33 , Tail
34 >
35 >;
36#else
37 struct make_deduced_items
38 : ::boost::mpl::eval_if<
39 ::boost::is_same<Spec,::boost::parameter::void_>
40 , ::boost::mpl::identity< ::boost::parameter::void_>
41 , ::boost::mpl::eval_if<
42 ::boost::parameter::aux::is_deduced<Spec>
43 , ::boost::parameter::aux::make_deduced_item<Spec,Tail>
44 , Tail
45 >
46 >
47 {
48 };
49#endif // BOOST_PARAMETER_CAN_USE_MP11
50}}} // namespace boost::parameter::aux
51
52#endif // include guard
53
54

source code of boost/libs/parameter/include/boost/parameter/aux_/pack/make_deduced_items.hpp