在第一次需要它的时候，这样一个静态的分配器可能会创建事件的每个类型，以后每次只返回由新的信息更新过的相同实例。
Such a static allocator might lazily create each type of event the first time it is needed and subsequently return the same instance each time, updated with the new information.
后三个参数用于指定关系组合类型、信息成员和分配器类型。
The last three parameters are used to specify the collection type of the relation, the information member and the allocator type.
内存分配器必须的数据结构来组织关于内存的分配和释放内存块的信息使用。
The memory allocator must use some memory for data structures to organize information about blocks of memory that are allocated and freed.
内存分配器必须的数据结构来组织关于内存的分配和释放内存块的信息使用。
The memory allocator must use some memory for data structures to organize information about blocks of memory that are allocated and freed.
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