(PECL ds >= 1.0.0)
Ds\Deque::capacity — Returns the current capacity
此函数没有参数。
The current capacity.
示例 #1 Ds\Deque::capacity() example
<?php
$deque = new \Ds\Deque();
var_dump($deque->capacity());
$deque->push(...range(1, 50));
var_dump($deque->capacity());
?>以上示例的输出类似于：
int(8) int(64)