Synchronous benchmarks must provide this trait. The apply method defines a single iteration in a sample. Setup and Teardown are defined by the before and after methods respectively. The before method runs before a sample of benchmarks and after runs after the all iterations in the sample have completed. If your benchmark requires setup and/or teardown to occur beween each iteration of the benchmark, then you can use before_iteration and after_iteration methods respectively that run before/after each iteration.
trait iso MicroBenchmark
fun box name() : String val
fun box config() : BenchConfig val
fun box overhead() : MicroBenchmark iso^
fun ref before() : None val ?
fun ref before_iteration() : None val ?
fun ref apply() : None val ?
fun ref after() : None val ?
fun ref after_iteration() : None val ?
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https://stdlib.ponylang.io/ponybench-MicroBenchmark