What's the situation where you would want to use this function but not need
the additional facilities (baseline, warmup, statistical analysis) of a
fully-fledged (micro-)benchmarking library?

https://www.bfilipek.com/2016/01/micro-benchmarking-libraries-for-c.html


On Sat, 17 Jul 2021 at 22:41, Paul Raffer via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> Some weeks ago I asked if there is the need for a function which measures
> the execution time of another function, but nobody responded. Could you
> please give me a short feedback.
>
> Possible implementation:
> template <typename Duration, typename Result>
> struct measurement_result {
> Duration duration;
> Result result;
> };
>
> template <
> typename Clock = std::chrono::high_resolution_clock,
> typename F, typename... Args>
> auto measure_ignore_result(F f, Args&&... args)
> {
> auto const start = Clock::now();
> f(std::forward<Args>(args)...);
> auto const stop = Clock::now();
> auto const duration = stop - start;
> return measurement_result<decltype(duration),
> std::monostate>{duration};
> }
> template <
> typename Clock = std::chrono::high_resolution_clock,
> typename F, typename... Args,
> std::enable_if_t<std::is_void_v<std::result_of_t<F(Args...)>>,
> bool> = true>
> auto measure(F f, Args&&... args)
> {
> return measure_ignore_result(
> std::forward<F>(f), std::forward<Args>(args)...);
> }
> template <
> typename Clock = std::chrono::high_resolution_clock,
> typename F, typename... Args,
> std::enable_if_t<!std::is_void_v<std::result_of_t<F(Args...)>>,
> bool> = true>
> auto measure(F f, Args&&... args)
> {
> auto const start = Clock::now();
> auto const result = f(std::forward<Args>(args)...);
> auto const stop = Clock::now();
> auto const duration = stop - start;
> return measurement_result{duration, result};
> }
>
> Usage:
>
> auto fib(int i) -> int
> {
> return i <= 1 ? i : fib(i-1) + fib(i-2);
> }
>
> auto main() -> int
> {
> std::cout << std::chrono::duration<double>(measure(fib,
> 42).duration).count();
> }
>
>
>
> Paul Raffer
>
>
> --
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>