-// Copyright Daniel Wallin 2006. Use, modification and distribution is
-// subject to 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 Daniel Wallin 2006.
+// 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_VALUE_TYPE_060921_HPP
-# define BOOST_PARAMETER_VALUE_TYPE_060921_HPP
+#define BOOST_PARAMETER_VALUE_TYPE_060921_HPP
-# include <boost/mpl/apply.hpp>
-# include <boost/mpl/assert.hpp>
-# include <boost/mpl/and.hpp>
-# include <boost/parameter/aux_/result_of0.hpp>
-# include <boost/parameter/aux_/void.hpp>
-# include <boost/type_traits/is_same.hpp>
+#include <boost/parameter/aux_/void.hpp>
+#include <boost/parameter/config.hpp>
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <boost/mp11/integral.hpp>
+#include <boost/mp11/list.hpp>
+#include <boost/mp11/utility.hpp>
+#include <type_traits>
+#else
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/apply_wrap.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/type_traits/is_same.hpp>
+#endif
namespace boost { namespace parameter {
-// A metafunction that, given an argument pack, returns the type of
-// the parameter identified by the given keyword. If no such
-// parameter has been specified, returns Default
-
-# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
-template <class Parameters, class Keyword, class Default>
-struct value_type0
-{
- typedef typename mpl::apply_wrap3<
- typename Parameters::binding,Keyword,Default,mpl::false_
- >::type type;
-
- BOOST_MPL_ASSERT_NOT((
- mpl::and_<
- is_same<Default, void_>
- , is_same<type, void_>
- >
- ));
-};
-# endif
-
-template <class Parameters, class Keyword, class Default = void_>
-struct value_type
-{
-# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
- typedef typename mpl::eval_if<
- mpl::is_placeholder<Parameters>
- , mpl::identity<int>
- , value_type0<Parameters,Keyword,Default>
- >::type type;
-# else
- typedef typename mpl::apply_wrap3<
- typename Parameters::binding,Keyword,Default,mpl::false_
- >::type type;
-
- BOOST_MPL_ASSERT_NOT((
- mpl::and_<
- is_same<Default, void_>
- , is_same<type, void_>
+ // A metafunction that, given an argument pack, returns the value type
+ // of the parameter identified by the given keyword. If no such parameter
+ // has been specified, returns Default
+
+ template <typename Parameters, typename Keyword, typename Default>
+ struct value_type0
+ {
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ using type = ::boost::mp11::mp_apply_q<
+ typename Parameters::binding
+ , ::boost::mp11::mp_list<Keyword,Default,::boost::mp11::mp_false>
+ >;
+
+ static_assert(
+ ::boost::mp11::mp_if<
+ ::std::is_same<Default,::boost::parameter::void_>
+ , ::boost::mp11::mp_if<
+ ::std::is_same<type,::boost::parameter::void_>
+ , ::boost::mp11::mp_false
+ , ::boost::mp11::mp_true
+ >
+ , ::boost::mp11::mp_true
+ >::value
+ , "required parameters must not result in void_ type"
+ );
+#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
+ typedef typename ::boost::mpl::apply_wrap3<
+ typename Parameters::binding
+ , Keyword
+ , Default
+ , ::boost::mpl::false_
+ >::type type;
+
+ BOOST_MPL_ASSERT((
+ typename ::boost::mpl::eval_if<
+ ::boost::is_same<Default,::boost::parameter::void_>
+ , ::boost::mpl::if_<
+ ::boost::is_same<type,::boost::parameter::void_>
+ , ::boost::mpl::false_
+ , ::boost::mpl::true_
+ >
+ , ::boost::mpl::true_
+ >::type
+ ));
+#endif // BOOST_PARAMETER_CAN_USE_MP11
+ };
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ template <typename Placeholder, typename Keyword, typename Default>
+ struct value_type1
+ {
+ using type = ::boost::mp11::mp_apply_q<
+ Placeholder
+ , ::boost::mp11::mp_list<Keyword,Default,::boost::mp11::mp_false>
+ >;
+
+ static_assert(
+ ::boost::mp11::mp_if<
+ ::std::is_same<Default,::boost::parameter::void_>
+ , ::boost::mp11::mp_if<
+ ::std::is_same<type,::boost::parameter::void_>
+ , ::boost::mp11::mp_false
+ , ::boost::mp11::mp_true
+ >
+ , ::boost::mp11::mp_true
+ >::value
+ , "required parameters must not result in void_ type"
+ );
+ };
+#endif // BOOST_PARAMETER_CAN_USE_MP11
+}} // namespace boost::parameter
+
+#include <boost/parameter/aux_/is_placeholder.hpp>
+
+namespace boost { namespace parameter {
+
+ template <
+ typename Parameters
+ , typename Keyword
+ , typename Default = ::boost::parameter::void_
+ >
+ struct value_type
+#if !defined(BOOST_PARAMETER_CAN_USE_MP11)
+ : ::boost::mpl::eval_if<
+ ::boost::parameter::aux::is_mpl_placeholder<Parameters>
+ , ::boost::mpl::identity<int>
+ , ::boost::parameter::value_type0<Parameters,Keyword,Default>
>
- ));
-# endif
-
- BOOST_MPL_AUX_LAMBDA_SUPPORT(3,value_type,(Parameters,Keyword,Default))
-};
-
-// A metafunction that, given an argument pack, returns the type of
-// the parameter identified by the given keyword. If no such
-// parameter has been specified, returns the type returned by invoking
-// DefaultFn
-template <class Parameters, class Keyword, class DefaultFn>
-struct lazy_value_type
-{
- typedef typename mpl::apply_wrap3<
- typename Parameters::binding
- , Keyword
- , typename aux::result_of0<DefaultFn>::type
- , mpl::false_
- >::type type;
-};
+#endif
+ {
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ using type = typename ::boost::mp11::mp_if<
+ ::boost::parameter::aux::is_mpl_placeholder<Parameters>
+ , ::boost::mp11::mp_identity<int>
+ , ::boost::mp11::mp_if<
+ ::boost::parameter::aux::is_mp11_placeholder<Parameters>
+ , ::boost::parameter::value_type1<Parameters,Keyword,Default>
+ , ::boost::parameter::value_type0<Parameters,Keyword,Default>
+ >
+ >::type;
+#endif
+ };
+}} // namespace boost::parameter
+
+#include <boost/parameter/aux_/result_of0.hpp>
+namespace boost { namespace parameter {
+ // A metafunction that, given an argument pack, returns the value type
+ // of the parameter identified by the given keyword. If no such parameter
+ // has been specified, returns the type returned by invoking DefaultFn
+ template <typename Parameters, typename Keyword, typename DefaultFn>
+ struct lazy_value_type
+ {
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+ using type = ::boost::mp11::mp_apply_q<
+ typename Parameters::binding
+ , ::boost::mp11::mp_list<
+ Keyword
+ , typename ::boost::parameter::aux::result_of0<DefaultFn>::type
+ , ::boost::mp11::mp_false
+ >
+ >;
+#else
+ typedef typename ::boost::mpl::apply_wrap3<
+ typename Parameters::binding
+ , Keyword
+ , typename ::boost::parameter::aux::result_of0<DefaultFn>::type
+ , ::boost::mpl::false_
+ >::type type;
+#endif // BOOST_PARAMETER_CAN_USE_MP11
+ };
}} // namespace boost::parameter
-#endif // BOOST_PARAMETER_VALUE_TYPE_060921_HPP
+#endif // include guard
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