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.venv/Lib/site-packages/pyarrow/include/arrow/util/stopwatch.h

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+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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.
+
+#pragma once
+
+#include <cassert>
+#include <chrono>
+
+namespace arrow {
+namespace internal {
+
+class StopWatch {
+  // This clock should give us wall clock time
+  using ClockType = std::chrono::steady_clock;
+
+ public:
+  StopWatch() {}
+
+  void Start() { start_ = ClockType::now(); }
+
+  // Returns time in nanoseconds.
+  uint64_t Stop() {
+    auto stop = ClockType::now();
+    std::chrono::nanoseconds d = stop - start_;
+    assert(d.count() >= 0);
+    return static_cast<uint64_t>(d.count());
+  }
+
+ private:
+  std::chrono::time_point<ClockType> start_;
+};
+
+}  // namespace internal
+}  // namespace arrow