比较C ++ STL列表迭代器
[英]compare C++ STL list iterators
问题描述
I have a C++ STL list of objects in my app that is built on startup and never altered afterwards; 
我的应用程序中有一个C ++ STL对象列表，它是在启动时构建的，之后从未改变过; is it the case that two independent iterators that point to the same list node always compare equal ? 是这样的情况，指向同一列表节点的两个独立迭代器总是比较相等吗？
2 个解决方案
解决方案1
10 2012-11-16 13:12:44
Yes. 是。 One of the requirements for forward iterators is: 前向迭代器的要求之一是：
C++11 22.4.5/6: If
aandbare both dereferenceable, thena == bif and only if*aand*bare bound to the same object.a和b都是可解除引用的，则a == b当且仅当*a和*b绑定到同一个对象时。
All iterators over standard containers are (at least) forward iterators. 标准容器上的所有迭代器都是（至少）前向迭代器。
解决方案2
2 2012-11-16 13:10:19
Yes, according to cplusplus.com: 是的，根据cplusplus.com：
http://www.cplusplus.com/reference/std/iterator/ForwardIterator/ http://www.cplusplus.com/reference/std/iterator/ForwardIterator/
Accepts equality/inequality comparisons.
Equal iterators imply the same element is pointed
(I'm not really a fan of this site but I'd trust it here.) （我不是这个网站的粉丝，但我相信它。）
cppreference.com agrees and states more than that, namely all InputIterators (that can be read from) are EqualityComparable, see: cppreference.com同意并说明不止于此，即所有InputIterators（可以读取）都是EqualityComparable，请参阅：
http://en.cppreference.com/w/cpp/concept/InputIterator http://en.cppreference.com/w/cpp/concept/InputIterator
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