Alias for a functor that shuts down a sample before threads are joined.
Declared in <bslmt_throughputbenchmark.h>
typedef bsl::function<void(bool)> ShutdownSampleFunction;An alias to a function meeting the following contract: ` /// Clean up at the end of the sample run, before threads have been /// joined. If the specified isLast is true, this is the last /// sample run. void shutdownSample(bool isLast); `