第一个分配程序是通用分配，可以满足针对任何数量的连续内存块的请求。
The first is a general-purpose allocation and can serve requests for any number of contiguous chunks.
fast _ pool_allocator最适合于一次请求单个(通常较大)块，但是也适用于通用分配，不过具有一些性能缺点。
Fast_pool_allocator is best suited for requesting a single (often big) chunk at a time but also works for general purposes with some performance handicap.
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