If the optionally specified manager is not 0, return manager; otherwise return the address of the default metrics manager instance, or 0 if the default metrics manager instance has not yet been created or has already been destroyed. Note that this operation is logically equivalent to manager ? manager : instance().
Synopsis
Declared in <balm_defaultmetricsmanager.h>
static
MetricsManager*
manager(MetricsManager* manager = 0);
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