Returns whether the topology has a readable server

# MongoDB\Driver\TopologyDescription::hasReadableServer

(mongodb >=1.13.0)

MongoDB\Driver\TopologyDescription::hasReadableServer — Returns whether the topology has a readable server

### 説明

final public function MongoDB\Driver\TopologyDescription::hasReadableServer(?MongoDB\Driver\ReadPreference `$readPreference` = `null`): bool

Returns whether the topology has a readable server or, if `readPreference` is specified, a server matching the specified read preference.

### パラメータ

この関数にはパラメータはありません。

### 戻り値

Returns whether the topology has a readable server or, if `readPreference` is specified, a server matching the specified read preference.

### エラー / 例外

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

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