(PECL ds >= 1.0.0)
Ds\Set::capacity — Returns the current capacity.
Returns the current capacity.
此函数没有参数。
The current capacity.
Example #1 Ds\Set::capacity() example
<?php
$set = new \Ds\Set();
var_dump($set->capacity());
$set->push(...range(1, 50));
var_dump($set->capacity());
?>
以上例程的输出类似于：
int(16) int(64)