Doug Lea的分配程序有着与我们的版本非常类似的基本结构，但是它加入了索引，这使得搜索速度更快，并且可以将多个没有被使用的块组合为一个大的块。

Doug Lea's allocator has a basic structure much like our version, but it incorporates indexes to make searching faster and has the ability to combine multiple unused chunks into one large chunk.

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