Allocates enough memory for a required capacity

# Ds\Queue::allocate

(PECL ds >= 1.0.0)

Ds\Queue::allocate — Allocates enough memory for a required capacity

### 说明

public function Ds\Queue::allocate(int `$capacity`): void

Ensures that enough memory is allocated for a required capacity. This removes the need to reallocate the internal buffer as values are added.

> 注意:

> Capacity will always be rounded up to the nearest power of 2.

### 参数

`capacity`

  The number of values for which capacity should be allocated.

  > 注意:

  > Capacity will stay the same if this value is less than or equal to the current capacity.

  > 注意:

  > Capacity will always be rounded up to the nearest power of 2.

### 返回值

没有返回值。

### 示例

示例 #1 Ds\Queue::allocate() example

    <?php
    $queue = new \Ds\Queue();
    var_dump($queue->capacity());

    $queue->allocate(100);
    var_dump($queue->capacity());
    ?>

以上示例的输出类似于：

    int(8)
    int(128)

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