add missing header

2014-10-03 20:00:33 -07:00 · 2014-10-03 20:00:33 -07:00 · 4aec64871d
commit 4aec64871d
parent e0ba9e9a8c
1 changed files with 110 additions and 0 deletions
--- a/include/mapnik/symbolizer_dispatch.hpp
+++ b/include/mapnik/symbolizer_dispatch.hpp
@ -0,0 +1,110 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2014 Artem Pavlenko
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_SYMBOLIZER_DISPATCH_HPP
+#define MAPNIK_SYMBOLIZER_DISPATCH_HPP
+
+// mapnik
+#include <mapnik/feature.hpp>
+#include <mapnik/proj_transform.hpp>
+#include <mapnik/feature_style_processor.hpp>
+#include <mapnik/util/variant.hpp>
+
+namespace mapnik
+{
+
+template <typename T0,typename T1> struct has_process;
+
+template <bool>
+struct process_impl
+{
+    template <typename T0, typename T1, typename T2, typename T3>
+    static void process(T0 & ren, T1 const& sym, T2 & f, T3 const& tr)
+    {
+        ren.process(sym,f,tr);
+    }
+};
+
+template <> // No-op specialization
+struct process_impl<false>
+{
+    template <typename T0, typename T1, typename T2, typename T3>
+    static void process(T0 &, T1 const&, T2 &, T3 const&)
+    {
+#ifdef MAPNIK_DEBUG
+    #ifdef _MSC_VER
+    #pragma NOTE(process function not implemented)
+    #else
+    #warning process function not implemented
+    #endif
+#endif
+    }
+};
+
+/** Calls the renderer's process function,
+ * \param output     Renderer
+ * \param f          Feature to process
+ * \param prj_trans  Projection
+ * \param sym        Symbolizer object
+ */
+template <typename Processor>
+struct symbolizer_dispatch : public util::static_visitor<>
+{
+    symbolizer_dispatch(Processor & output,
+                        mapnik::feature_impl & f,
+                        proj_transform const& prj_trans)
+        : output_(output),
+          f_(f),
+          prj_trans_(prj_trans)  {}
+
+    template <typename T>
+    void operator () (T const& sym) const
+    {
+        process_impl<has_process<Processor,T>::value>::process(output_,sym,f_,prj_trans_);
+    }
+
+    Processor & output_;
+    mapnik::feature_impl & f_;
+    proj_transform const& prj_trans_;
+};
+
+using no_tag = char (&)[1];
+using yes_tag = char (&)[2];
+
+template <typename T0, typename T1, void (T0::*)(T1 const&, mapnik::feature_impl &, proj_transform const&) >
+struct process_memfun_helper {};
+
+template <typename T0, typename T1> no_tag  has_process_helper(...);
+template <typename T0, typename T1> yes_tag has_process_helper(process_memfun_helper<T0, T1, &T0::process>* p);
+
+template<typename T0,typename T1>
+struct has_process
+{
+    using processor_impl_type = typename T0::processor_impl_type;
+    BOOST_STATIC_CONSTANT(bool
+                          , value = sizeof(has_process_helper<processor_impl_type,T1>(0)) == sizeof(yes_tag)
+        );
+};
+
+}
+
+#endif // MAPNIK_SYMBOLIZER_DISPATCH_HPP