The library guarantees that iterators access elements in order by key.The begin operation yields the element with the lowest key.Incrementing that iterator yields elements in nondescending order.
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- 除此之外,关联容器还定义一些新操作,并对某些顺序容器同样提供的操作重新定义了其含义或返回类型,这些操作的差别体现了关联容器中键的使用。