Allocates enough memory for a required capacity

# Ds\Map::allocate

(PECL ds >= 1.0.0)

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

### 説明

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

Allocates enough memory for a required capacity.

### パラメータ

`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.

### 返り値

値を返しません。

### 例

例1 Ds\Map::allocate() example

`<?php
$map = new \Ds\Map();
var_dump($map->capacity());
$map->allocate(100);
var_dump($map->capacity());
?>`

上の例の出力は、 たとえば以下のようになります。

    int(16)
    int(128)