Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2011 Thomas Heller
+
+    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_PHOENIX_CORE_DETAIL_PHX2_RESULT_HPP
+#define BOOST_PHOENIX_CORE_DETAIL_PHX2_RESULT_HPP
+#include <boost/phoenix/core/limits.hpp>
+#include <boost/phoenix/support/iterate.hpp>
+#include <boost/mpl/has_xxx.hpp>
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace phoenix {
+    namespace detail
+    {
+        BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
+
+        template <typename Result>
+        struct has_phx2_result_impl
+        {
+            typedef char yes;
+            typedef char (&no)[2];
+
+            template <typename A>
+            static yes check_(typename A::type *);
+
+            template <typename A>
+            static no check_(...);
+
+            static bool const value = (sizeof(yes) == sizeof(check_<Result>(0)));
+            typedef boost::mpl::bool_<value> type;
+        };
+
+#ifdef BOOST_PHOENIX_NO_VARIADIC_PHX2_RESULT
+        #include <boost/phoenix/core/detail/cpp03/phx2_result.hpp>
+#else
+        template <typename F, typename... A>
+        struct has_phx2_result
+            : mpl::eval_if<
+                has_result_type<F>
+              , mpl::false_
+              , has_phx2_result_impl<typename F::template result<F(A...)> >
+            >::type
+        {};
+
+        template <typename F, typename... A>
+        struct phx2_result
+        {
+            typedef typename F::template result<A...>::type type;
+        };
+
+        template <typename F, typename... A>
+        struct phx2_result<F, A &...>
+        {
+            typedef typename F::template result<A...>::type type;
+        };
+
+        template <typename F, typename... A>
+        struct phx2_result<F, A const &...>
+        {
+            typedef typename F::template result<A...>::type type;
+        };
+#endif
+    }
+}}
+
+#endif
+