Add test for c++17 and <variant>

Author: ChristosT

unittests/data/cpp_standard_17.hpp

@@ -0,0 +1,9 @@
+// Copyright 2014-2017 Insight Software Consortium.
+// Copyright 2004-2009 Roman Yakovenko.
+// Distributed under the Boost Software License, Version 1.0.
+// See http://www.boost.org/LICENSE_1_0.txt
+
+// See https://github.com/CastXML/pygccxml/issues/180
+// variant introduced in C++17
+#include <variant>
+std::variant<int, double, float> value;

unittests/test_cpp_standards.py

@@ -48,6 +48,15 @@ def test(self):
             RuntimeError,
             lambda: parser.parse(["cpp_standards.hpp"], self.config))
 
+    def test_cpp17(self):
+        """
+        Test c++17 by setting cflags.
+
+        """
+
+        self.config.cflags = "-std=c++17"
+        parser.parse(["cpp_standard_17.hpp"], self.config)
+
 
 def create_suite():
     suite = unittest.TestSuite()