From b9c048a6ac629aa19a62d827bbb4a000dfba3c8a Mon Sep 17 00:00:00 2001
From: Hummeltech <6109326+hummeltech@users.noreply.github.com>
Date: Tue, 4 Jun 2024 13:24:04 -0700
Subject: [PATCH] Support for Mapnik >= 4 no longer using boost:optional (#436)

---
 src/parameterize_style.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/parameterize_style.cpp b/src/parameterize_style.cpp
index 892e432..732a454 100644
--- a/src/parameterize_style.cpp
+++ b/src/parameterize_style.cpp
@@ -15,7 +15,9 @@
  * along with this program; If not, see http://www.gnu.org/licenses/.
  */
 
+#if MAPNIK_MAJOR_VERSION < 4
 #include <boost/optional.hpp>
+#endif
 #include <mapnik/datasource.hpp>
 #include <mapnik/datasource_cache.hpp>
 #include <mapnik/layer.hpp>
@@ -65,7 +67,11 @@ static void parameterize_map_language(mapnik::Map &m, char *parameter)
 		mapnik::parameters params = l.datasource()->params();
 
 		if (params.find("table") != params.end()) {
+#if MAPNIK_MAJOR_VERSION >= 4
+			std::optional<std::string> table = params.get<std::string>("table");
+#else
 			boost::optional<std::string> table = params.get<std::string>("table");
+#endif
 
 			if (table && table->find(",name") != std::string::npos) {
 				std::string str = *table;