Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*==============================================================================
+    Copyright (c) 2005-2010 Joel de Guzman
+
+    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_IS_ACTOR_HPP
+#define BOOST_PHOENIX_CORE_IS_ACTOR_HPP
+
+#include <boost/mpl/bool.hpp>
+
+// Note to Thomas and any future maintainer: please make this as
+// lightweight as possible (as it is right now).
+
+namespace boost { namespace phoenix
+{
+///////////////////////////////////////////////////////////////////////////////
+//
+//  is_actor<T>
+//
+//      Tests if T is an actor. Evaluates to mpl::true_ or mpl::false_
+//
+///////////////////////////////////////////////////////////////////////////////
+
+    template <typename Expr>
+    struct actor;
+
+    template <typename T, typename Enable = void>
+    struct is_actor
+        : mpl::false_
+    {};
+
+    template <typename T>
+    struct is_actor<T const>
+        : is_actor<T>
+    {};
+
+    template <typename T>
+    struct is_actor<T &>
+        : is_actor<T>
+    {};
+
+    template <typename Expr>
+    struct is_actor<actor<Expr> >
+        : mpl::true_
+    {};
+}}
+
+#endif