1 files changed, 79 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/core/call.hpp b/boost/spirit/home/x3/core/call.hpp
new file mode 100644
index 0000000000..a4139751df
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+++ b/boost/spirit/home/x3/core/call.hpp
@@ -0,0 +1,79 @@
+/*=============================================================================
+    Copyright (c) 2001-2014 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)
+=============================================================================*/
+#if !defined(SPIRIT_CALL_CONTEXT_MAY_26_2014_0234PM)
+#define SPIRIT_CALL_CONTEXT_MAY_26_2014_0234PM
+
+#include <type_traits>
+
+#include <boost/spirit/home/x3/support/context.hpp>
+#include <boost/spirit/home/x3/support/utility/is_callable.hpp>
+#include <boost/range/iterator_range.hpp>
+
+namespace boost { namespace spirit { namespace x3
+{
+    ////////////////////////////////////////////////////////////////////////////
+    struct rule_val_context_tag;
+
+    template <typename Context>
+    inline auto _val(Context const& context)
+        -> decltype(x3::get<rule_val_context_tag>(context))
+    {
+        return x3::get<rule_val_context_tag>(context);
+    }
+
+    ////////////////////////////////////////////////////////////////////////////
+    struct where_context_tag;
+
+    template <typename Context>
+    inline auto _where(Context const& context)
+        -> decltype(x3::get<where_context_tag>(context))
+    {
+        return x3::get<where_context_tag>(context);
+    }
+
+    ////////////////////////////////////////////////////////////////////////////
+    struct attr_context_tag;
+
+    template <typename Context>
+    inline auto _attr(Context const& context)
+        -> decltype(x3::get<attr_context_tag>(context))
+    {
+        return x3::get<attr_context_tag>(context);
+    }
+
+    ////////////////////////////////////////////////////////////////////////////
+    namespace detail
+    {
+        template <typename F, typename Context>
+        auto call(F f, Context const& context, mpl::true_)
+        {
+            return f(context);
+        }
+
+        template <typename F, typename Context>
+        auto call(F f, Context const& context, mpl::false_)
+        {
+            return f();
+        }
+    }
+
+    template <
+        typename F, typename Iterator
+      , typename Context, typename RuleContext, typename Attribute>
+    auto call(
+        F f, Iterator& first, Iterator const& last
+      , Context const& context, RuleContext& rcontext, Attribute& attr)
+    {
+        boost::iterator_range<Iterator> rng(first, last);
+        auto val_context = make_context<rule_val_context_tag>(rcontext, context);
+        auto where_context = make_context<where_context_tag>(rng, val_context);
+        auto attr_context = make_context<attr_context_tag>(attr, where_context);
+        return detail::call(f, attr_context, is_callable<F(decltype(attr_context) const&)>());
+    }
+}}}
+
+#endif