[#BloombergLP-bsls-Stopwatch-start]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/Stopwatch.adoc[Stopwatch]::start
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:mrdocs:

Place this stopwatch in the RUNNING state and begin accumulating elapsed times if this object was in the STOPPED state. Optionally specify a `collectCpuTimes` flag indicating whether CPU times should be collected. If `collectCpuTimes` is not specified, then CPU times are _not_ collected. Note that the instantaneous total elapsed times are available from the RUNNING state. Also note that disabling collection of CPU times will result in fewer systems calls and therefore faster measurements. Also note that `collectCpuTimes` may be expressed using the one of the class level constants `k_COLLECT_WALL_TIME_ONLY`, and `k_COLLECT_WALL_AND_CPU_TIMES` for easier immediate understanding of the meaning of the client code.

== Synopsis

Declared in `<bsls_stopwatch.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
start(bool collectCpuTimes = false);
----


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