#include <boost/noncopyable.hpp>
#include <string>
-class write_interop_subtitle_test;
-class write_interop_subtitle_test2;
-class write_interop_subtitle_test3;
-class write_smpte_subtitle_test;
-class write_smpte_subtitle_test2;
-class write_smpte_subtitle_test3;
+struct write_interop_subtitle_test;
+struct write_interop_subtitle_test2;
+struct write_interop_subtitle_test3;
+struct write_smpte_subtitle_test;
+struct write_smpte_subtitle_test2;
+struct write_smpte_subtitle_test3;
namespace dcp {