/**
* Subtracts a snapshot from another one.
*
* The result will be a snapshot describing the execution metrics between the two snapshots
* e.g. execution-time between two snapshots, memory-consumption from one snapshot to another etc.
*
* @param Snapshot $other
*
* @return Snapshot
*/
public function diff(Snapshot $other)
{
return new self($this->_time - $other->getTime(), $this->_memoryUsage - $other->getMemoryUsage(), $this->_realMemoryUsage - $other->getRealMemoryUsage(), ($this->_memoryUsagePeak + $other->getMemoryUsagePeak()) / 2, ($this->_realMemoryUsagePeak + $other->getRealMemoryUsagePeak()) / 2);
}