feat():initial version

install/boost_1_75_0/include/boost/parameter/binding.hpp

@@ -0,0 +1,164 @@
+// 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)
+
+#ifndef BOOST_PARAMETER_BINDING_DWA200558_HPP
+#define BOOST_PARAMETER_BINDING_DWA200558_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 reference 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 binding0
+    {
+#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_true>
+        >;
+
+        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::true_
+        >::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 binding1
+    {
+        using type = ::boost::mp11::mp_apply_q<
+            Placeholder
+          , ::boost::mp11::mp_list<Keyword,Default,::boost::mp11::mp_true>
+        >;
+
+        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 binding
+#if !defined(BOOST_PARAMETER_CAN_USE_MP11)
+      : ::boost::mpl::eval_if<
+            ::boost::parameter::aux::is_mpl_placeholder<Parameters>
+          , ::boost::mpl::identity<int>
+          , ::boost::parameter::binding0<Parameters,Keyword,Default>
+        >
+#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::binding1<Parameters,Keyword,Default>
+              , ::boost::parameter::binding0<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 reference 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_binding
+    {
+#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_true
+            >
+        >;
+#else
+        typedef typename ::boost::mpl::apply_wrap3<
+            typename Parameters::binding
+          , Keyword
+          , typename ::boost::parameter::aux::result_of0<DefaultFn>::type
+          , ::boost::mpl::true_
+        >::type type;
+#endif  // BOOST_PARAMETER_CAN_USE_MP11
+    };
+}} // namespace boost::parameter
+
+#endif  // include guard
+