nor the non-const versions modify the container). 这个方法不会修改容器内的内容。
No contained elements are accessed by the call, but the iterator returned can be used to access or modify elements. Concurrently accessing or modifying different elements is safe.
该方法不会访问容器李的元素，但是返回的这个iterator可以用来访问以及修改元素，并且都是安全的。
Exception safety
No-throw guarantee: this member function never throws exceptions.
该方法不会抛出异常。
The copy construction or assignment of the returned iterator is also guaranteed to never throw.
利用复制构造器或者是赋值运算符得到的该iterator也不会抛出异常。
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2014-8-9
于GDUT