A block is allocated from the free pool by first converting the requested bytes to an index in the bucket array, using the following equation.

当从空闲池分配块时，首先使用以下公式把请求的字节数转换为bucket数组索引。

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When a block of memory is returned to the free pool, the bucket index is calculated just like it is done with allocation.

当把内存块返回给空闲池时，像分配时一样计算bucket索引。

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