feat():initial version

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

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+// Copyright David Abrahams, Daniel Wallin 2003.
+// 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_DEDUCED_HPP
+#define BOOST_PARAMETER_DEDUCED_HPP
+
+#include <boost/parameter/aux_/use_default.hpp>
+
+namespace boost { namespace parameter {
+
+    // This metafunction can be used to describe the treatment of particular
+    // named parameters for the purposes of overload elimination with SFINAE,
+    // by placing specializations in the parameters<...> list.
+    //
+    // If a keyword k is specified with deduced<...>, that keyword
+    // will be automatically deduced from the argument list.
+    template <typename Tag>
+    struct deduced
+    {
+        typedef Tag key_type;
+    };
+}}
+
+#include <boost/parameter/config.hpp>
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <boost/mp11/integral.hpp>
+#else
+#include <boost/mpl/bool.hpp>
+#endif
+
+namespace boost { namespace parameter { namespace aux {
+
+    template <typename T>
+    struct is_deduced_aux
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+      : ::boost::mp11::mp_false
+#else
+      : ::boost::mpl::false_
+#endif
+    {
+    };
+
+    template <typename Tag>
+    struct is_deduced_aux< ::boost::parameter::deduced<Tag> >
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+      : ::boost::mp11::mp_true
+#else
+      : ::boost::mpl::true_
+#endif
+    {
+    };
+
+    template <typename T>
+    struct is_deduced0
+      : ::boost::parameter::aux::is_deduced_aux<typename T::key_type>::type
+    {
+    };
+}}} // namespace boost::parameter::aux
+
+#include <boost/parameter/required.hpp>
+#include <boost/parameter/optional.hpp>
+
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+#include <boost/mp11/utility.hpp>
+#else
+#include <boost/mpl/if.hpp>
+#endif
+
+namespace boost { namespace parameter { namespace aux {
+
+    //
+    // tag_type, has_default, and predicate --
+    //
+    // These metafunctions accept a ParameterSpec and extract the
+    // keyword tag, whether or not a default is supplied for the
+    // parameter, and the predicate that the corresponding actual
+    // argument type is required match.
+    //
+    // a ParameterSpec is a specialization of either keyword<...>,
+    // required<...>, optional<...>
+    //
+
+    template <typename T>
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+    using has_default = ::boost::mp11::mp_if<
+        ::boost::parameter::aux::is_required<T>
+      , ::boost::mp11::mp_false
+      , ::boost::mp11::mp_true
+    >;
+#else
+    struct has_default
+      : ::boost::mpl::if_<
+            ::boost::parameter::aux::is_required<T>
+          , ::boost::mpl::false_
+          , ::boost::mpl::true_
+        >::type
+    {
+    };
+#endif
+
+    template <typename T>
+#if defined(BOOST_PARAMETER_CAN_USE_MP11)
+    using is_deduced = ::boost::mp11::mp_if<
+        ::boost::mp11::mp_if<
+            ::boost::parameter::aux::is_optional<T>
+          , ::boost::mp11::mp_true
+          , ::boost::parameter::aux::is_required<T>
+        >
+      , ::boost::parameter::aux::is_deduced0<T>
+      , ::boost::mp11::mp_false
+    >;
+#else
+    struct is_deduced
+      : ::boost::mpl::if_<
+            typename ::boost::mpl::if_<
+                ::boost::parameter::aux::is_optional<T>
+              , ::boost::mpl::true_
+              , ::boost::parameter::aux::is_required<T>
+            >::type
+          , ::boost::parameter::aux::is_deduced0<T>
+          , ::boost::mpl::false_
+        >::type
+    {
+    };
+#endif  // BOOST_PARAMETER_CAN_USE_MP11
+}}} // namespace boost::parameter::aux
+
+#endif  // include guard
+