From 32238368748b7d2185faf93057b0e5e547251a57 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Fri, 10 May 2013 16:45:54 +0100
Subject: [PATCH] + potential boost::variant optimization

---
 include/mapnik/value.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/mapnik/value.hpp b/include/mapnik/value.hpp
index a7b900f9d..cb72592e8 100644
--- a/include/mapnik/value.hpp
+++ b/include/mapnik/value.hpp
@@ -47,6 +47,15 @@
 #include <unicode/unistr.h>
 #include <unicode/ustring.h>
 
+namespace boost {
+
+  template <>
+  struct has_nothrow_copy<mapnik::value_unicode_string>
+    : mpl::true_
+  {
+  };
+
+}
 
 namespace mapnik  {