Returns the previous description for the topology

# MongoDB\Driver\Monitoring\TopologyChangedEvent::getPreviousDescription

(mongodb >=1.13.0)

MongoDB\Driver\Monitoring\TopologyChangedEvent::getPreviousDescription — Returns the previous description for the topology

### 说明

final public function MongoDB\Driver\Monitoring\TopologyChangedEvent::getPreviousDescription(): MongoDB\Driver\TopologyDescription

### 参数

此函数没有参数。

### 返回值

Returns the previous MongoDB\Driver\TopologyDescription for the topology.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

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