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-rw-r--r--impl/IdMap.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/impl/IdMap.hpp b/impl/IdMap.hpp
index ed0723e..8cb25f8 100644
--- a/impl/IdMap.hpp
+++ b/impl/IdMap.hpp
@@ -1,6 +1,7 @@
#ifndef ID_MAP_HPP
#define ID_MAP_HPP
+#include <cassert>
#include <ostream>
template<typename T, typename V>