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-rw-r--r--src/util/cpp11_container.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/util/cpp11_container.h b/src/util/cpp11_container.h
index f839be19a..7ac2fc371 100644
--- a/src/util/cpp11_container.h
+++ b/src/util/cpp11_container.h
@@ -21,6 +21,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#define MT_CPP11CONTAINER_HEADER
#if __cplusplus >= 201103L
+#define USE_UNORDERED_CONTAINERS
+#endif
+
+#if _MSC_VER >= 1800
+#define USE_UNORDERED_CONTAINERS
+#endif
+
+#ifdef USE_UNORDERED_CONTAINERS
#include <unordered_map>
#include <unordered_set>
#define UNORDERED_MAP std::unordered_map