-// Copyright David Abrahams 2005. Distributed under the Boost
-// Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+// Copyright David Abrahams 2005.
+// Copyright Cromwell D. Enage 2017.
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
#ifndef BOOST_PARAMETER_AUX_TAG_DWA2005610_HPP
-# define BOOST_PARAMETER_AUX_TAG_DWA2005610_HPP
+#define BOOST_PARAMETER_AUX_TAG_DWA2005610_HPP
+
+#include <boost/parameter/aux_/unwrap_cv_reference.hpp>
+#include <boost/parameter/aux_/tagged_argument.hpp>
+#include <boost/parameter/config.hpp>
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11) && \
+ !BOOST_WORKAROUND(BOOST_MSVC, >= 1910)
+// MSVC-14.1+ assigns rvalue references to tagged_argument instances
+// instead of tagged_argument_rref instances with this code.
+#include <boost/mp11/integral.hpp>
+#include <boost/mp11/utility.hpp>
+#include <type_traits>
+
+namespace boost { namespace parameter { namespace aux {
+
+ template <typename Keyword, typename Arg>
+ struct tag_if_lvalue_reference
+ {
+ using type = ::boost::parameter::aux::tagged_argument_list_of_1<
+ ::boost::parameter::aux::tagged_argument<
+ Keyword
+ , typename ::boost::parameter::aux
+ ::unwrap_cv_reference<Arg>::type
+ >
+ >;
+ };
+
+ template <typename Keyword, typename Arg>
+ struct tag_if_scalar
+ {
+ using type = ::boost::parameter::aux::tagged_argument_list_of_1<
+ ::boost::parameter::aux
+ ::tagged_argument<Keyword,typename ::std::add_const<Arg>::type>
+ >;
+ };
+
+ template <typename Keyword, typename Arg>
+ using tag_if_otherwise = ::boost::mp11::mp_if<
+ ::std::is_scalar<typename ::std::remove_const<Arg>::type>
+ , ::boost::parameter::aux::tag_if_scalar<Keyword,Arg>
+ , ::boost::mp11::mp_identity<
+ ::boost::parameter::aux::tagged_argument_list_of_1<
+ ::boost::parameter::aux::tagged_argument_rref<Keyword,Arg>
+ >
+ >
+ >;
+
+ template <typename Keyword, typename Arg>
+ using tag = ::boost::mp11::mp_if<
+ ::boost::mp11::mp_if<
+ ::std::is_lvalue_reference<Arg>
+ , ::boost::mp11::mp_true
+ , ::boost::parameter::aux::is_cv_reference_wrapper<Arg>
+ >
+ , ::boost::parameter::aux::tag_if_lvalue_reference<Keyword,Arg>
+ , ::boost::parameter::aux::tag_if_otherwise<Keyword,Arg>
+ >;
+}}} // namespace boost::parameter::aux_
-# include <boost/parameter/aux_/unwrap_cv_reference.hpp>
-# include <boost/parameter/aux_/tagged_argument.hpp>
+#elif defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING)
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/type_traits/add_const.hpp>
+#include <boost/type_traits/is_scalar.hpp>
+#include <boost/type_traits/is_lvalue_reference.hpp>
+#include <boost/type_traits/remove_const.hpp>
namespace boost { namespace parameter { namespace aux {
-template <class Keyword, class ActualArg
+ template <typename Keyword, typename ActualArg>
+ struct tag
+ {
+ typedef typename ::boost::parameter::aux
+ ::unwrap_cv_reference<ActualArg>::type Arg;
+ typedef typename ::boost::add_const<Arg>::type ConstArg;
+ typedef typename ::boost::remove_const<Arg>::type MutArg;
+ typedef typename ::boost::mpl::eval_if<
+ typename ::boost::mpl::if_<
+ ::boost::is_lvalue_reference<ActualArg>
+ , ::boost::mpl::true_
+ , ::boost::parameter::aux::is_cv_reference_wrapper<ActualArg>
+ >::type
+ , ::boost::mpl::identity<
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ ::boost::parameter::aux::tagged_argument_list_of_1<
+#endif
+ ::boost::parameter::aux::tagged_argument<Keyword,Arg>
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ >
+#endif
+ >
+ , ::boost::mpl::if_<
+ ::boost::is_scalar<MutArg>
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ , ::boost::parameter::aux::tagged_argument_list_of_1<
+ ::boost::parameter::aux::tagged_argument<Keyword,ConstArg>
+ >
+ , ::boost::parameter::aux::tagged_argument_list_of_1<
+ ::boost::parameter::aux::tagged_argument_rref<Keyword,Arg>
+ >
+#else
+ , ::boost::parameter::aux::tagged_argument<Keyword,ConstArg>
+ , ::boost::parameter::aux::tagged_argument_rref<Keyword,Arg>
+#endif
+ >
+ >::type type;
+ };
+}}} // namespace boost::parameter::aux_
+
+#else // !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING)
+
+namespace boost { namespace parameter { namespace aux {
+
+ template <
+ typename Keyword
+ , typename Arg
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
- , class = typename is_cv_reference_wrapper<ActualArg>::type
-#endif
- >
-struct tag
-{
- typedef tagged_argument<
- Keyword
- , typename unwrap_cv_reference<ActualArg>::type
- > type;
-};
+ , typename = typename ::boost::parameter::aux
+ ::is_cv_reference_wrapper<Arg>::type
+#endif
+ >
+ struct tag
+ {
+ typedef ::boost::parameter::aux::tagged_argument<
+ Keyword
+ , typename ::boost::parameter::aux::unwrap_cv_reference<Arg>::type
+ > type;
+ };
+}}} // namespace boost::parameter::aux_
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
-template <class Keyword, class ActualArg>
-struct tag<Keyword,ActualArg,mpl::false_>
-{
- typedef tagged_argument<
- Keyword
- , ActualArg
- > type;
-};
-#endif
+#include <boost/mpl/bool.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+
+namespace boost { namespace parameter { namespace aux {
+ template <typename Keyword, typename Arg>
+ struct tag<Keyword,Arg,::boost::mpl::false_>
+ {
+ typedef ::boost::parameter::aux::tagged_argument<
+ Keyword
+ , typename ::boost::remove_reference<Arg>::type
+ > type;
+ };
}}} // namespace boost::parameter::aux_
-#endif // BOOST_PARAMETER_AUX_TAG_DWA2005610_HPP
+#endif // Borland workarounds needed.
+#endif // MP11 or perfect forwarding support
+#endif // include guard
+
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