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#pragma clang system_header
// 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 arrow20 {
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 arrow20
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