[英]Map Iterator working for begin() but not for rbegin()
I have some class called Order. 我有一个叫Order的课。 For some reason, the following code won't compile while using rbegin(), but it works for begin(). 出于某种原因,以下代码在使用rbegin()时不会编译,但它适用于begin()。 Is there a problem in the way I'm declaring the iterator or perhaps a problem with my pointer reference? 我正在声明迭代器的方式是否存在问题,或者我的指针引用可能存在问题?
map<double, list<Order*>> m
typedef map<double, list<Order*>>::iterator iter;
iter iterator;
iterator = m.rbegin(); // this only works for m.begin()
Thank you! 谢谢!
rbegin()
返回一个reverse_iterator
,而不是一个iterator
。
The types returned from begin()
and rbegin()
are different: 从begin()
和rbegin()
返回的类型是不同的:
begin()
returns std::map<K, V>::iterator
begin()
返回std::map<K, V>::iterator
rbegin()
returns std::reverse_iterator<std::map<K, V>::iterator>
rbegin()
返回std::reverse_iterator<std::map<K, V>::iterator>
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