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-rw-r--r--zend/includes.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/zend/includes.h b/zend/includes.h
index 63b435e..582530b 100644
--- a/zend/includes.h
+++ b/zend/includes.h
@@ -20,6 +20,7 @@
#include <list>
#include <exception>
#include <type_traits>
+#include <functional>
// for debug
#include <iostream>