comparison DEPENDENCIES/generic/include/boost/spirit/home/karma/detail/attributes.hpp @ 16:2665513ce2d3

Add boost headers

+//  Copyright (c) 2001-2011 Hartmut Kaiser
+//  Copyright (c) 2001-2011 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_KARMA_DETAIL_ATTRIBUTES_APR_18_2010_0453PM)
+#define SPIRIT_KARMA_DETAIL_ATTRIBUTES_APR_18_2010_0453PM
+
+#include <boost/spirit/home/karma/domain.hpp>
+#include <boost/spirit/home/support/attributes_fwd.hpp>
+#include <boost/spirit/home/support/attributes.hpp>
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit { namespace karma
+{
+    template <typename Exposed, typename Transformed, typename Enable = void>
+    struct transform_attribute
+    {
+        typedef Transformed type;
+        static Transformed pre(Exposed& val) 
+        { 
+            return Transformed(traits::extract_from<Transformed>(val, unused));
+        }
+        // Karma only, no post() and no fail() required
+    };
+
+    template <typename Exposed, typename Transformed>
+    struct transform_attribute<boost::optional<Exposed> const, Transformed
+      , typename disable_if<is_same<boost::optional<Exposed>, Transformed> >::type>
+    {
+        typedef Transformed const& type;
+        static Transformed const& pre(boost::optional<Exposed> const& val)
+        {
+            return boost::get<Transformed>(val);
+        }
+    };
+
+    template <typename Attribute>
+    struct transform_attribute<Attribute const, Attribute>
+    {
+        typedef Attribute const& type;
+        static Attribute const& pre(Attribute const& val) { return val; }
+        // Karma only, no post() and no fail() required
+    };
+
+    // reference types need special handling
+    template <typename Exposed, typename Transformed>
+    struct transform_attribute<Exposed&, Transformed>
+      : transform_attribute<Exposed, Transformed>
+    {};
+
+    template <typename Exposed, typename Transformed>
+    struct transform_attribute<Exposed const&, Transformed>
+      : transform_attribute<Exposed const, Transformed>
+    {};
+
+    template <typename Attribute>
+    struct transform_attribute<Attribute const&, Attribute>
+      : transform_attribute<Attribute const, Attribute>
+    {};
+
+    // unused_type needs some special handling as well
+    template <>
+    struct transform_attribute<unused_type, unused_type>
+    {
+        typedef unused_type type;
+        static unused_type pre(unused_type) { return unused; }
+    };
+
+    template <>
+    struct transform_attribute<unused_type const, unused_type>
+      : transform_attribute<unused_type, unused_type>
+    {};
+
+    template <typename Attribute>
+    struct transform_attribute<unused_type, Attribute>
+      : transform_attribute<unused_type, unused_type>
+    {};
+
+    template <typename Attribute>
+    struct transform_attribute<unused_type const, Attribute>
+      : transform_attribute<unused_type, unused_type>
+    {};
+
+    template <typename Attribute>
+    struct transform_attribute<Attribute, unused_type>
+      : transform_attribute<unused_type, unused_type>
+    {};
+
+    template <typename Attribute>
+    struct transform_attribute<Attribute const, unused_type>
+      : transform_attribute<unused_type, unused_type>
+    {};
+}}}
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost { namespace spirit { namespace traits
+{
+    template <typename Exposed, typename Transformed>
+    struct transform_attribute<Exposed, Transformed, karma::domain>
+      : karma::transform_attribute<Exposed, Transformed>
+    {};
+}}}
+
+#endif
+
+