46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
// Copyright David Abrahams, Daniel Wallin 2003.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PARAMETER_AUX_PACK_MAKE_ITEMS_HPP
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#define BOOST_PARAMETER_AUX_PACK_MAKE_ITEMS_HPP
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#include <boost/parameter/aux_/void.hpp>
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#include <boost/parameter/aux_/pack/item.hpp>
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#include <boost/parameter/config.hpp>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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#include <boost/mp11/utility.hpp>
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#include <type_traits>
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#else
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/type_traits/is_same.hpp>
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#endif
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namespace boost { namespace parameter { namespace aux {
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// Creates a item typelist.
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template <typename Spec, typename Arg, typename Tail>
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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using make_items = ::boost::mp11::mp_if<
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::std::is_same<Arg,::boost::parameter::void_>
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, ::boost::mp11::mp_identity< ::boost::parameter::void_>
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, ::boost::parameter::aux::make_item<Spec,Arg,Tail>
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>;
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#else
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struct make_items
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: ::boost::mpl::eval_if<
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::boost::is_same<Arg,::boost::parameter::void_>
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, ::boost::mpl::identity< ::boost::parameter::void_>
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, ::boost::parameter::aux::make_item<Spec,Arg,Tail>
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>
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{
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};
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#endif
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}}} // namespace boost::parameter::aux
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#endif // include guard
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