51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
//
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// Gundolf Haase, Oct 18 2024
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//
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#pragma once
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#include <chrono> // timing
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#include <stack>
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//using Clock = std::chrono::system_clock; //!< The wall clock timer chosen
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using Clock = std::chrono::high_resolution_clock;
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using TPoint= std::chrono::time_point<Clock>;
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// [Galowicz, C++17 STL Cookbook, p. 29]
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std::stack<TPoint> MyStopWatch; //!< starting time of stopwatch
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/** Starts stopwatch timer.
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* Use as @code tic(); myfunction(...) ; double tsec = toc(); @endcode
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*
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* The timining can be nested and the recent time point is stored on top of the stack.
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*
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* @return recent time point
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* @see toc
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*/
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auto tic()
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{
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MyStopWatch.push(Clock::now());
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return MyStopWatch.top();
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}
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/** Returns the elapsed time from stopwatch.
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*
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* The time point from top of the stack is used
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* if time point @p t_b is not passed as input parameter.
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* Use as @code tic(); myfunction(...) ; double tsec = toc(); @endcode
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* or as @code auto t_b = tic(); myfunction(...) ; double tsec = toc(t_b); @endcode
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* The last option is to be used in the case of
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* non-nested but overlapping time measurements.
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*
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* @param[in] t_b start time of some stop watch
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* @return elapsed time in seconds.
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*
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*/
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double toc(TPoint const &t_b = MyStopWatch.top())
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{
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// https://en.cppreference.com/w/cpp/chrono/treat_as_floating_point
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using Unit = std::chrono::seconds;
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using FpSeconds = std::chrono::duration<double, Unit::period>;
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auto t_e = Clock::now();
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MyStopWatch.pop();
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return FpSeconds(t_e-t_b).count();
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}
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