restore local variant_io.hpp with specialisation for bool (https://github.com/mapnik/node-mapnik/issues/582)

include/mapnik/util/variant_io.hpp

@@ -0,0 +1,74 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2015 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_UTIL_VARIANT_IO_HPP
+#define MAPNIK_UTIL_VARIANT_IO_HPP
+
+
+namespace mapnik { namespace util {
+
+namespace detail {
+
+// operator<< helper
+template <typename Out>
+class printer
+{
+public:
+    explicit printer(Out & out)
+        : out_(out) {}
+    printer& operator=(printer const&) = delete;
+
+// visitor
+    template <typename T>
+    void operator()(T const& operand) const
+    {
+        out_ << operand;
+    }
+
+/// specialized visitor for boolean
+    void operator()(bool const & val) const
+    {
+        if (val) {
+            out_ << "true";
+        } else {
+            out_ << "false";
+        }
+    }
+private:
+    Out & out_;
+};
+
+} // namespace detail
+
+// operator<<
+template <typename charT, typename traits, typename... Types>
+VARIANT_INLINE std::basic_ostream<charT, traits>&
+operator<< (std::basic_ostream<charT, traits>& out, variant<Types...> const& rhs)
+{
+    detail::printer<std::basic_ostream<charT, traits>> visitor(out);
+    mapnik::util::apply_visitor(visitor, rhs);
+    return out;
+}
+
+}}
+
+#endif // MAPNIK_UTIL_VARIANT_IO_HPP

src/save_map.cpp

@@ -46,7 +46,7 @@
 #include <mapnik/group/group_layout.hpp>
 #include <mapnik/group/group_symbolizer_properties.hpp>
 #include <mapnik/util/variant.hpp>
-#include <mapbox/variant/variant_io.hpp>
+#include <mapnik/util/variant_io.hpp>
 #pragma GCC diagnostic push
 #include <mapnik/warning_ignore.hpp>
 #include <boost/algorithm/string.hpp>