71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
#ifndef H_CELERO_TIMER_H
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#define H_CELERO_TIMER_H
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///
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/// \author John Farrier
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///
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/// \copyright Copyright 2015, 2016, 2017, 2018. 2019 John Farrier
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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#include <celero/Utilities.h>
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#include <stdint.h>
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namespace celero
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{
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///
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/// \namespace timer
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///
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/// \author John Farrier
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///
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/// \brief Provide basic cross-platform timing functions to measure code performance speed.
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///
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namespace timer
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{
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///
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/// \brief Retrieves the current time.
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///
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/// \author John Farrier
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///
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/// \return The time, in ticks.
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///
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CELERO_EXPORT uint64_t GetSystemTime();
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///
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/// \brief Converts the gathered system time into seconds.
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///
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/// This assumes "x" is a delta and relatively small (easily fits inside of a double).
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///
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/// \author John Farrier
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///
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/// \param x The time, in ticks.
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///
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/// \return The time, in seconds.
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///
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constexpr double ConvertSystemTime(const uint64_t x)
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{
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return x * celero::UsToSec;
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}
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///
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/// On Windows, this caches the frequency of the high performance clock.
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///
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/// \return The number of microseconds of precision that we have.
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///
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CELERO_EXPORT double CachePerformanceFrequency(bool quiet);
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} // namespace timer
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} // namespace celero
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#endif
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