We also review reference counting and provide a primer on templates, including some of the exacting syntactic requirements. 我们同时回顾引用计数,同时提供模板入门,包括一些精确的语法要求。
A droppable accumulator is reference counted, and is only really dropped after all the accumulators that depend on it have been dropped. 可删除累加器是引用计数的,它只在所有依赖于它的累加器都被删除后才真正删除。