From e653f4cc4c8891486cecf3132c504248e2c6d4f9 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Thu, 6 Jul 2017 16:01:06 +0200
Subject: [PATCH] make constructor explicit to avoid C2664 error with VS2017.

---
 include/mapnik/transform/transform_expression.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/mapnik/transform/transform_expression.hpp b/include/mapnik/transform/transform_expression.hpp
index 1b6649f42..18c5ac092 100644
--- a/include/mapnik/transform/transform_expression.hpp
+++ b/include/mapnik/transform/transform_expression.hpp
@@ -171,7 +171,7 @@ struct transform_node
         : base_() {}
 
     template <typename T>
-    transform_node(T const& val)
+    explicit transform_node(T const& val)
         : base_(val) {}
 
     template <typename T>