[C++] Add a way to retrieve stats

1 files changed, 54 insertions, 0 deletions

diff --git a/stats.h b/stats.h
new file mode 100644
index 0000000..41525e1
--- /dev/null
+++ b/stats.h
@@ -0,0 +1,54 @@
+// Copyright 2015 Google Inc. All rights reserved
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef STATS_H_
+#define STATS_H_
+
+#include <string>
+
+using namespace std;
+
+class Stats {
+ public:
+  explicit Stats(const char* name);
+
+  string String() const;
+
+ private:
+  void Start();
+  void End();
+
+  friend class ScopedStatsRecorder;
+
+  const char* name_;
+  double start_time_;
+  double elapsed_;
+};
+
+class ScopedStatsRecorder {
+ public:
+  explicit ScopedStatsRecorder(Stats* st);
+  ~ScopedStatsRecorder();
+
+ private:
+  Stats* st_;
+};
+
+void ReportAllStats();
+
+#define COLLECT_STATS(name)                     \
+  static Stats stats(name);                     \
+  ScopedStatsRecorder ssr(&stats)
+
+#endif  // STATS_H_