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+/*********************                                                        */
+/*! \file stats_utils.h
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Gereon Kremer
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
+ ** in the top-level source directory and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief Statistic utilities
+ **
+ ** Statistic utilities
+ **/
+
+#include "cvc4_private_library.h"
+
+#ifndef CVC4__UTIL__STATS_UTILS_H
+#define CVC4__UTIL__STATS_UTILS_H
+
+#include <iosfwd>
+
+namespace CVC4 {
+
+namespace timer_stat_detail {
+struct duration;
+}
+
+std::ostream& operator<<(std::ostream& os,
+                         const timer_stat_detail::duration& dur) CVC4_PUBLIC;
+
+}  // namespace CVC4
+
+#endif