Imported existing code

libraries/include/boost/spirit/home/qi/operator/plus.hpp

@@ -0,0 +1,92 @@
+/*=============================================================================
+    Copyright (c) 2001-2007 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_PLUS_MARCH_13_2007_0127PM)
+#define SPIRIT_PLUS_MARCH_13_2007_0127PM
+
+#include <boost/spirit/home/qi/domain.hpp>
+#include <boost/spirit/home/support/component.hpp>
+#include <boost/spirit/home/support/detail/container.hpp>
+#include <boost/spirit/home/support/attribute_transform.hpp>
+#include <vector>
+
+namespace boost { namespace spirit { namespace qi
+{
+    struct plus
+    {
+        template <typename T>
+        struct build_attribute_container
+        {
+            typedef std::vector<T> type;
+        };
+
+        template <typename Component, typename Context, typename Iterator>
+        struct attribute :
+            build_container<plus, Component, Iterator, Context>
+        {
+        };
+
+        template <
+            typename Component
+          , typename Iterator, typename Context
+          , typename Skipper, typename Attribute>
+        static bool parse(
+            Component const& component
+          , Iterator& first, Iterator const& last
+          , Context& context, Skipper const& skipper
+          , Attribute& attr)
+        {
+            typedef typename
+                result_of::subject<Component>::type
+            subject_type;
+            typedef typename
+                traits::attribute_of<
+                    qi::domain, subject_type, Context, Iterator>::type
+            attr_type;
+            typedef typename subject_type::director director;
+
+            // create a value if Attribute is not unused_type
+            typename mpl::if_<
+                is_same<typename remove_const<Attribute>::type, unused_type>
+              , unused_type
+              , attr_type>::type
+            val;
+
+            if (director::parse(
+                    subject(component)
+                  , first, last, context, skipper, val)
+                )
+            {
+                container::push_back(attr, val);
+                while(director::parse(
+                        subject(component)
+                      , first, last, context, skipper, val)
+                    )
+                {
+                    container::push_back(attr, val);
+                }
+                return true;
+            }
+            return false;
+        }
+
+        template <typename Component, typename Context>
+        static std::string what(Component const& component, Context const& ctx)
+        {
+            std::string result = "plus[";
+
+            typedef typename
+                result_of::subject<Component>::type::director
+            director;
+
+            result += director::what(subject(component), ctx);
+            result += "]";
+            return result;
+        }
+    };
+}}}
+
+#endif