code clean up
Change-Id: I6109c795a6734b040a034e4b5ee6a62cdb56310e
diff --git a/src/collocatordb.cc b/src/collocatordb.cc
index e2d37d5..28035f6 100644
--- a/src/collocatordb.cc
+++ b/src/collocatordb.cc
@@ -1,15 +1,15 @@
#define EXPORT __attribute__((visibility("visible")))
#define IMPORT
-#include <assert.h>
+#include <cassert>
#include <memory>
#include <iostream>
#include <algorithm>
#include <vector>
-#include <stdint.h>
+#include <cstdint>
#include <string>
#include <sstream> // for ostringstream
-#include <math.h>
+#include <cmath>
#include <rocksdb/cache.h>
#include "rocksdb/db.h"
#include "rocksdb/env.h"