Add one more #include<functional>

This commit is contained in:
sdong 2019-11-05 09:25:25 -08:00
parent 622456584d
commit 6d353bc011

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@ -6,6 +6,7 @@
#include <assert.h>
#include <condition_variable>
#include <functional>
#include <mutex>
#include <string>
#include <unordered_set>