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_UNMATCHED_ARGUMENT_HPP
7 #define BOOST_PARAMETER_AUX_PACK_UNMATCHED_ARGUMENT_HPP
8 
9 #include <boost/parameter/config.hpp>
10 
11 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
12 #include <type_traits>
13 #else
14 #include <boost/mpl/bool.hpp>
15 #include <boost/mpl/if.hpp>
16 #include <boost/mpl/assert.hpp>
17 #include <boost/type_traits/is_same.hpp>
18 #endif
19 
20 namespace boost { namespace parameter { namespace aux {
21 
22     template <typename T>
23     struct unmatched_argument
24     {
25 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
26         static_assert(::std::is_same<T,void>::value, "T == void");
27 #else
28         BOOST_MPL_ASSERT((
29             typename ::boost::mpl::if_<
30                 ::boost::is_same<T,void>
31               , ::boost::mpl::true_
32               , ::boost::mpl::false_
33             >::type
34         ));
35 #endif
36         typedef int type;
37     };
38 }}} // namespace boost::parameter::aux
39 
40 #endif  // include guard
41 
42