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2018-02-08 21:28:33 -05:00
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+/*=============================================================================
+    Copyright (c) 2003 Jonathan de Halleux (dehalleux@pelikhan.com)
+    http://spirit.sourceforge.net/
+
+  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_SPIRIT_ACTOR_DECREMENT_ACTOR_HPP
+#define BOOST_SPIRIT_ACTOR_DECREMENT_ACTOR_HPP
+
+#include <boost/spirit/home/classic/namespace.hpp>
+#include <boost/spirit/home/classic/actor/ref_actor.hpp>
+
+namespace boost { namespace spirit {
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
+
+    ///////////////////////////////////////////////////////////////////////////
+    //  Summary:
+    //  A semantic action policy that calls the -- operator on a reference.
+    //  (This doc uses convention available in actors.hpp)
+    //
+    //  Actions:
+    //      --ref;
+    //
+    //  Policy name:
+    //      decrement_action
+    //
+    //  Policy holder, corresponding helper method:
+    //      ref_actor, decrement_a( ref );
+    //
+    //  () operators: both.
+    //
+    //  See also ref_actor for more details.
+    ///////////////////////////////////////////////////////////////////////////
+    struct decrement_action
+    {
+        template<
+            typename T
+        >
+        void act(T& ref_) const
+        {
+            --ref_;
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    // helper method that creates a and_assign_actor.
+    ///////////////////////////////////////////////////////////////////////////
+    template<typename T>
+    inline ref_actor<T,decrement_action> decrement_a(T& ref_)
+    {
+        return ref_actor<T,decrement_action>(ref_);
+    }
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_END
+
+}}
+
+#endif